Public trust registry
Formula Registry
137 internally tested tools. Each has an identifiable formula ID, version, documented assumptions and a transparent planning boundary. Automated regression checks passed 2026-10-03 · independent external engineering review is not claimed.
Steel weight
Rebar mass per metre, per bar and for a stated bar count from nominal diameter and steel density.
Automated regression checks passed 2026-10-03 · independent external engineering review is not claimed. Two unit regression checks per calculator; additional known-answer cases cover selected formulas.
Cement and sand plaster
Wall plaster cement bags and dry sand volume from net wall area, thickness and an entered volume mix.
Automated regression checks passed 2026-10-03 · independent external engineering review is not claimed. Two unit regression checks per calculator; additional known-answer cases cover selected formulas.
Waterproofing membrane
Membrane roll quantities with explicit side and end laps, layers, upstand area and cutting allowance.
Automated regression checks passed 2026-10-03 · independent external engineering review is not claimed. Two unit regression checks per calculator; additional known-answer cases cover selected formulas.
AC tonnage
Compare an entered cooling-load scenario in kW, BTU/h and refrigeration tons. Includes an editable area factor.
Automated regression checks passed 2026-10-03 · independent external engineering review is not claimed. Two unit regression checks per calculator; additional known-answer cases cover selected formulas.
Concrete slab
Volume, ready-mix order, and bag equivalent for a rectangle, circle, or L-shape.
Automated regression checks passed 2026-10-03 · independent external engineering review is not claimed. Two unit regression checks per calculator; additional known-answer cases cover selected formulas.
Concrete footing
Continuous footing volume, ready-mix quantity, and whole-bag equivalent.
Automated regression checks passed 2026-10-03 · independent external engineering review is not claimed. Two unit regression checks per calculator; additional known-answer cases cover selected formulas.
Concrete wall
Concrete wall volume with stated thickness, waste, and ready-mix rounding.
Automated regression checks passed 2026-10-03 · independent external engineering review is not claimed. Two unit regression checks per calculator; additional known-answer cases cover selected formulas.
Concrete column
Round concrete-column volume, ready-mix order and bag-equivalent estimate.
Automated regression checks passed 2026-10-03 · independent external engineering review is not claimed. Two unit regression checks per calculator; additional known-answer cases cover selected formulas.
Concrete driveway
Driveway volume, ready-mix order and bag-equivalent estimate with visible allowance.
Automated regression checks passed 2026-10-03 · independent external engineering review is not claimed. Two unit regression checks per calculator; additional known-answer cases cover selected formulas.
Concrete patio
Patio slab volume, ready-mix order and bag-equivalent estimate with visible allowance.
Automated regression checks passed 2026-10-03 · independent external engineering review is not claimed. Two unit regression checks per calculator; additional known-answer cases cover selected formulas.
Concrete bag calculator
Slab volume translated into a whole-bag purchase quantity using the stated bag yield.
Automated regression checks passed 2026-10-03 · independent external engineering review is not claimed. Two unit regression checks per calculator; additional known-answer cases cover selected formulas.
Concrete cost calculator
Preliminary material cost from a stated ready-mix quantity and local supplier rate.
Automated regression checks passed 2026-10-03 · independent external engineering review is not claimed. Two unit regression checks per calculator; additional known-answer cases cover selected formulas.
Roof shingle calculator
Pitched roof area, squares, type-specific shingle bundles and underlayment rolls.
Automated regression checks passed 2026-10-03 · independent external engineering review is not claimed. Two unit regression checks per calculator; additional known-answer cases cover selected formulas.
Roof pitch calculator
Roof pitch multiplier and slope angle from rise per 12 units of run.
Automated regression checks passed 2026-10-03 · independent external engineering review is not claimed. Two unit regression checks per calculator; additional known-answer cases cover selected formulas.
Metal roof calculator
Pitched roof area and whole fixed-panel quantity using net area per selected panel.
Automated regression checks passed 2026-10-03 · independent external engineering review is not claimed. Two unit regression checks per calculator; additional known-answer cases cover selected formulas.
Roofing underlayment calculator
Pitched roof area and whole underlayment-roll quantity using stated roll coverage.
Automated regression checks passed 2026-10-03 · independent external engineering review is not claimed. Two unit regression checks per calculator; additional known-answer cases cover selected formulas.
Roof flashing calculator
Whole flashing-piece quantity from required linear coverage and a visible allowance.
Automated regression checks passed 2026-10-03 · independent external engineering review is not claimed. Two unit regression checks per calculator; additional known-answer cases cover selected formulas.
Roofing waste calculator
Add a stated roofing waste allowance to an independently measured roof area.
Automated regression checks passed 2026-10-03 · independent external engineering review is not claimed. Two unit regression checks per calculator; additional known-answer cases cover selected formulas.
Roofing cost calculator
Preliminary roofing material cost from stated area, allowance and user-entered local rate.
Automated regression checks passed 2026-10-03 · independent external engineering review is not claimed. Two unit regression checks per calculator; additional known-answer cases cover selected formulas.
Flooring material
Floor area and purchase packages with a clear waste allowance.
Automated regression checks passed 2026-10-03 · independent external engineering review is not claimed. Two unit regression checks per calculator; additional known-answer cases cover selected formulas.
Tile calculator
Floor tile coverage and whole-package quantity with a visible cut allowance.
Automated regression checks passed 2026-10-03 · independent external engineering review is not claimed. Two unit regression checks per calculator; additional known-answer cases cover selected formulas.
Laminate flooring calculator
Laminate floor coverage and whole-carton quantity with stated waste.
Automated regression checks passed 2026-10-03 · independent external engineering review is not claimed. Two unit regression checks per calculator; additional known-answer cases cover selected formulas.
Vinyl flooring calculator
Vinyl flooring coverage and whole-package quantity with a visible allowance.
Automated regression checks passed 2026-10-03 · independent external engineering review is not claimed. Two unit regression checks per calculator; additional known-answer cases cover selected formulas.
Carpet calculator
Carpet area in square feet or metres, square-yard equivalent, and optional whole-roll or cut conversion.
Automated regression checks passed 2026-10-03 · independent external engineering review is not claimed. Two unit regression checks per calculator; additional known-answer cases cover selected formulas.
Flooring underlayment calculator
Underlayment coverage and whole-roll quantity with stated lap allowance.
Automated regression checks passed 2026-10-03 · independent external engineering review is not claimed. Two unit regression checks per calculator; additional known-answer cases cover selected formulas.
Flooring cost calculator
Preliminary flooring material cost from measured area, visible allowance and user-entered rate.
Automated regression checks passed 2026-10-03 · independent external engineering review is not claimed. Two unit regression checks per calculator; additional known-answer cases cover selected formulas.
Interior paint calculator
Room wall area, opening deductions, coats and rounded paint purchase quantity.
Automated regression checks passed 2026-10-03 · independent external engineering review is not claimed. Two unit regression checks per calculator; additional known-answer cases cover selected formulas.
Drywall material calculator
Room drywall sheets, fasteners, compound and tape with visible opening deductions and purchase rounding.
Automated regression checks passed 2026-10-03 · independent external engineering review is not claimed. Two unit regression checks per calculator; additional known-answer cases cover selected formulas.
Wall paint calculator
Straight-wall paint coverage, coats, allowance and whole-gallon purchase quantity.
Automated regression checks passed 2026-10-03 · independent external engineering review is not claimed. Two unit regression checks per calculator; additional known-answer cases cover selected formulas.
Ceiling paint calculator
Ceiling paint coverage, coats, allowance and whole-gallon purchase quantity.
Automated regression checks passed 2026-10-03 · independent external engineering review is not claimed. Two unit regression checks per calculator; additional known-answer cases cover selected formulas.
Paint cost calculator
Preliminary finish-paint material cost from whole gallons, a stated rate and visible allowance.
Automated regression checks passed 2026-10-03 · independent external engineering review is not claimed. Two unit regression checks per calculator; additional known-answer cases cover selected formulas.
Drywall cost calculator
Preliminary drywall-sheet material cost from stated sheet quantity, rate and visible allowance.
Automated regression checks passed 2026-10-03 · independent external engineering review is not claimed. Two unit regression checks per calculator; additional known-answer cases cover selected formulas.
Mulch calculator
Landscape bed volume, bulk mulch order, and whole-bag equivalent.
Automated regression checks passed 2026-10-03 · independent external engineering review is not claimed. Two unit regression checks per calculator; additional known-answer cases cover selected formulas.
Soil calculator
Bulk soil volume with a visible depth allowance and purchase rounding.
Automated regression checks passed 2026-10-03 · independent external engineering review is not claimed. Two unit regression checks per calculator; additional known-answer cases cover selected formulas.
Gravel calculator
Bulk gravel volume, estimated weight, and a visible delivery allowance.
Automated regression checks passed 2026-10-03 · independent external engineering review is not claimed. Two unit regression checks per calculator; additional known-answer cases cover selected formulas.
Sod calculator
Lawn area, waste allowance, and whole-roll sod purchase quantity.
Automated regression checks passed 2026-10-03 · independent external engineering review is not claimed. Two unit regression checks per calculator; additional known-answer cases cover selected formulas.
Paver calculator
Patio area, individual paver face coverage, and whole-paver order quantity.
Automated regression checks passed 2026-10-03 · independent external engineering review is not claimed. Two unit regression checks per calculator; additional known-answer cases cover selected formulas.
Board foot calculator
Lumber board-foot quantity from stated thickness, width, length, piece count and allowance.
Automated regression checks passed 2026-10-03 · independent external engineering review is not claimed. Two unit regression checks per calculator; additional known-answer cases cover selected formulas.
Wall stud calculator
Preliminary wall-stud count from wall run, spacing, openings and a visible allowance.
Automated regression checks passed 2026-10-03 · independent external engineering review is not claimed. Two unit regression checks per calculator; additional known-answer cases cover selected formulas.
Floor joist calculator
Preliminary joist count and total linear footage from framing run, span and stated spacing.
Automated regression checks passed 2026-10-03 · independent external engineering review is not claimed. Two unit regression checks per calculator; additional known-answer cases cover selected formulas.
Rafter calculator
Preliminary paired-rafter count and rafter length from roof plan dimensions, pitch and spacing.
Automated regression checks passed 2026-10-03 · independent external engineering review is not claimed. Two unit regression checks per calculator; additional known-answer cases cover selected formulas.
Linear lumber calculator
Whole stock-board count from total linear run, selected stock length and visible allowance.
Automated regression checks passed 2026-10-03 · independent external engineering review is not claimed. Two unit regression checks per calculator; additional known-answer cases cover selected formulas.
Plywood & sheet goods calculator
Whole sheet-goods quantity from rectangular coverage, selected sheet coverage and allowance.
Automated regression checks passed 2026-10-03 · independent external engineering review is not claimed. Two unit regression checks per calculator; additional known-answer cases cover selected formulas.
Material waste calculator
Add a transparent waste allowance to any measured material quantity.
Automated regression checks passed 2026-10-03 · independent external engineering review is not claimed. Two unit regression checks per calculator; additional known-answer cases cover selected formulas.
Construction markup calculator
Convert direct cost and a stated markup into a transparent customer price.
Automated regression checks passed 2026-10-03 · independent external engineering review is not claimed. Two unit regression checks per calculator; additional known-answer cases cover selected formulas.
Construction tax calculator
Calculate tax as a separately stated percentage of a taxable amount.
Automated regression checks passed 2026-10-03 · independent external engineering review is not claimed. Two unit regression checks per calculator; additional known-answer cases cover selected formulas.
Construction contingency calculator
Set aside a visible contingency allowance for preliminary project planning.
Automated regression checks passed 2026-10-03 · independent external engineering review is not claimed. Two unit regression checks per calculator; additional known-answer cases cover selected formulas.
Area & volume calculator
Rectangle, circle and triangle geometry with area, perimeter and simple-prism volume displayed in multiple units.
Automated regression checks passed 2026-10-03 · independent external engineering review is not claimed. Two unit regression checks per calculator; additional known-answer cases cover selected formulas.
Length unit converter
Transparent source-to-target length conversion with side-by-side feet and metres equivalents.
Automated regression checks passed 2026-10-03 · independent external engineering review is not claimed. Two unit regression checks per calculator; additional known-answer cases cover selected formulas.
Slab rebar calculator
Preliminary slab rebar count, linear footage and bar-weight planning from spacing, cover and bar size.
Automated regression checks passed 2026-10-03 · independent external engineering review is not claimed. Two unit regression checks per calculator; additional known-answer cases cover selected formulas.
Concrete block calculator
CMU count and mortar-bag planning from wall area, opening deductions and nominal block face size.
Automated regression checks passed 2026-10-03 · independent external engineering review is not claimed. Two unit regression checks per calculator; additional known-answer cases cover selected formulas.
Brick calculator
Brick count and mortar-bag planning from wall area, opening deductions and nominal brick face size.
Automated regression checks passed 2026-10-03 · independent external engineering review is not claimed. Two unit regression checks per calculator; additional known-answer cases cover selected formulas.
Stair calculator
Preliminary riser count, tread run and stringer length from total rise and target step dimensions.
Automated regression checks passed 2026-10-03 · independent external engineering review is not claimed. Two unit regression checks per calculator; additional known-answer cases cover selected formulas.
Fence calculator
Wood-fence posts, rails, pickets and post-hole concrete bags from run length and spacing.
Automated regression checks passed 2026-10-03 · independent external engineering review is not claimed. Two unit regression checks per calculator; additional known-answer cases cover selected formulas.
Siding calculator
Wall and gable siding area after openings, then squares and coverage units with a visible allowance.
Automated regression checks passed 2026-10-03 · independent external engineering review is not claimed. Two unit regression checks per calculator; additional known-answer cases cover selected formulas.
Insulation calculator
Batt or roll count from net coverage area, product coverage and a visible cutting allowance.
Automated regression checks passed 2026-10-03 · independent external engineering review is not claimed. Two unit regression checks per calculator; additional known-answer cases cover selected formulas.
Deck board calculator
Deck-board count and linear footage from deck size, board width, gap and stock length.
Automated regression checks passed 2026-10-03 · independent external engineering review is not claimed. Two unit regression checks per calculator; additional known-answer cases cover selected formulas.
Tile grout calculator
Grout volume and bag count from tile size, joint width, joint depth and floor area.
Automated regression checks passed 2026-10-03 · independent external engineering review is not claimed. Two unit regression checks per calculator; additional known-answer cases cover selected formulas.
Asphalt calculator
Compacted asphalt volume and tonnage from area, depth and a stated mix density.
Automated regression checks passed 2026-10-03 · independent external engineering review is not claimed. Two unit regression checks per calculator; additional known-answer cases cover selected formulas.
Post hole calculator
Concrete volume and bag count for round fence or deck post holes, including solid sonotube piers when post diameter is zero.
Automated regression checks passed 2026-10-03 · independent external engineering review is not claimed. Two unit regression checks per calculator; additional known-answer cases cover selected formulas.
Concrete mix calculator
Volumetric cement, sand and aggregate split from a known wet volume using a stated mix ratio and dry-volume factor.
Automated regression checks passed 2026-10-03 · independent external engineering review is not claimed. Two unit regression checks per calculator; additional known-answer cases cover selected formulas.
Tile thinset calculator
Thinset or tile-mortar bag count from tiled area, selected trowel coverage and a visible mixing allowance.
Automated regression checks passed 2026-10-03 · independent external engineering review is not claimed. Two unit regression checks per calculator; additional known-answer cases cover selected formulas.
Ridge cap calculator
Hip and ridge cap bundles from measured ridge and hip length plus the selected bundle's linear coverage.
Automated regression checks passed 2026-10-03 · independent external engineering review is not claimed. Two unit regression checks per calculator; additional known-answer cases cover selected formulas.
Blown-in insulation calculator
Minimum whole-bag count from net area and the exact product, application and R-value chart's minimum-bags-per-1,000-ft² rate; optional extra stays separate.
Automated regression checks passed 2026-10-03 · independent external engineering review is not claimed. Two unit regression checks per calculator; additional known-answer cases cover selected formulas.
Stucco calculator
Stucco bag count from net wall area, number of coats and the selected bag's coverage per coat.
Automated regression checks passed 2026-10-03 · independent external engineering review is not claimed. Two unit regression checks per calculator; additional known-answer cases cover selected formulas.
Gutter calculator
Gutter and downspout piece counts from eave length, stock piece length and downspout runs.
Automated regression checks passed 2026-10-03 · independent external engineering review is not claimed. Two unit regression checks per calculator; additional known-answer cases cover selected formulas.
Trench volume calculator
Geometric trench volume with an optional project-specific loose-volume or over-excavation factor and stated truck capacity.
Automated regression checks passed 2026-10-03 · independent external engineering review is not claimed. Two unit regression checks per calculator; additional known-answer cases cover selected formulas.
Sand calculator
Bulk sand volume and tonnage from area, installed depth, a visible compaction factor and supplier density.
Automated regression checks passed 2026-10-03 · independent external engineering review is not claimed. Two unit regression checks per calculator; additional known-answer cases cover selected formulas.
Chain-link fence calculator
Chain-link fabric rolls, line posts, terminal posts and top-rail pieces from run length and spacing.
Automated regression checks passed 2026-10-03 · independent external engineering review is not claimed. Two unit regression checks per calculator; additional known-answer cases cover selected formulas.
Concrete stairs
Triangular-step volume, ready-mix order and bag equivalent from riser, tread, width and count.
Automated regression checks passed 2026-10-03 · independent external engineering review is not claimed. Two unit regression checks per calculator; additional known-answer cases cover selected formulas.
Mortar bags
Type N/S mortar volume and bag count from net wall area using a published 5.5 ft³ per 100 ft² rule of thumb.
Automated regression checks passed 2026-10-03 · independent external engineering review is not claimed. Two unit regression checks per calculator; additional known-answer cases cover selected formulas.
Retaining wall block
SRW and garden-block count from exposed face area and the selected block face.
Automated regression checks passed 2026-10-03 · independent external engineering review is not claimed. Two unit regression checks per calculator; additional known-answer cases cover selected formulas.
Vinyl fence
Vinyl panels, posts and caps from run length, panel width and gate openings.
Automated regression checks passed 2026-10-03 · independent external engineering review is not claimed. Two unit regression checks per calculator; additional known-answer cases cover selected formulas.
Drywall fasteners
Screw count and 1,000-count box round-up from sheet count.
Automated regression checks passed 2026-10-03 · independent external engineering review is not claimed. Two unit regression checks per calculator; additional known-answer cases cover selected formulas.
Curb and gutter
Combined curb-and-gutter volume, ready-mix order and bag equivalent from run length and the two cross-section rectangles.
Automated regression checks passed 2026-10-03 · independent external engineering review is not claimed. Two unit regression checks per calculator; additional known-answer cases cover selected formulas.
Drywall compound
Ready-mix joint-compound gallons and 4.5 gal pail count from net board area using a 100 ft² per gallon taping-and-finish rule of thumb.
Automated regression checks passed 2026-10-03 · independent external engineering review is not claimed. Two unit regression checks per calculator; additional known-answer cases cover selected formulas.
Stone veneer
Manufactured-stone carton count from net face area and the coverage printed on the carton.
Automated regression checks passed 2026-10-03 · independent external engineering review is not claimed. Two unit regression checks per calculator; additional known-answer cases cover selected formulas.
Wallpaper
Single-roll count from room perimeter, ceiling height, opening deductions and the usable coverage printed on the roll.
Automated regression checks passed 2026-10-03 · independent external engineering review is not claimed. Two unit regression checks per calculator; additional known-answer cases cover selected formulas.
Baseboard and trim
Stock-length sticks of baseboard from room perimeter after door deductions, with a visible cutting allowance.
Automated regression checks passed 2026-10-03 · independent external engineering review is not claimed. Two unit regression checks per calculator; additional known-answer cases cover selected formulas.
Crown molding
Stock-length sticks of crown from the full room perimeter, with extra waste for coped inside corners.
Automated regression checks passed 2026-10-03 · independent external engineering review is not claimed. Two unit regression checks per calculator; additional known-answer cases cover selected formulas.
Wire mesh
Welded-wire mesh sheet count from slab area and the face coverage of one sheet, with overlap sitting in the waste field.
Automated regression checks passed 2026-10-03 · independent external engineering review is not claimed. Two unit regression checks per calculator; additional known-answer cases cover selected formulas.
CMU grout fill
Grout volume and 80 lb bag equivalent to fill CMU cores from wall face, block module and grout per block.
Automated regression checks passed 2026-10-03 · independent external engineering review is not claimed. Two unit regression checks per calculator; additional known-answer cases cover selected formulas.
Paver base
Crushed-stone base and bedding-sand volumes under a patio from area, base thickness and sand thickness.
Automated regression checks passed 2026-10-03 · independent external engineering review is not claimed. Two unit regression checks per calculator; additional known-answer cases cover selected formulas.
Polymeric sand
Bag count of joint sand from patio area and the coverage printed on the polymeric-sand bag.
Automated regression checks passed 2026-10-03 · independent external engineering review is not claimed. Two unit regression checks per calculator; additional known-answer cases cover selected formulas.
Gravel driveway
Driveway gravel volume and tonnage from length, width, compacted depth and supplier density.
Automated regression checks passed 2026-10-03 · independent external engineering review is not claimed. Two unit regression checks per calculator; additional known-answer cases cover selected formulas.
Ice and water shield
Self-adhered ice-and-water roll count from eave length, coverage up the roof and valley length.
Automated regression checks passed 2026-10-03 · independent external engineering review is not claimed. Two unit regression checks per calculator; additional known-answer cases cover selected formulas.
Roof sheathing
Plywood or OSB sheet count from roof footprint, pitch multiplier and sheet coverage.
Automated regression checks passed 2026-10-03 · independent external engineering review is not claimed. Two unit regression checks per calculator; additional known-answer cases cover selected formulas.
Grass seed
Pounds of seed from lawn area and the labelled rate per 1,000 square feet.
Automated regression checks passed 2026-10-03 · independent external engineering review is not claimed. Two unit regression checks per calculator; additional known-answer cases cover selected formulas.
River rock
Decorative river-rock volume and tonnage from bed area, installed depth and supplier density.
Automated regression checks passed 2026-10-03 · independent external engineering review is not claimed. Two unit regression checks per calculator; additional known-answer cases cover selected formulas.
French drain
Drainage-stone volume, pipe length and wrap-fabric area from trench length, width, depth and pipe diameter.
Automated regression checks passed 2026-10-03 · independent external engineering review is not claimed. Two unit regression checks per calculator; additional known-answer cases cover selected formulas.
Pool volume
US gallons of water in a rectangular or circular pool from plan size and average depth. Not a chemical dose.
Automated regression checks passed 2026-10-03 · independent external engineering review is not claimed. Two unit regression checks per calculator; additional known-answer cases cover selected formulas.
Wheelchair ramp
Ramp run length and slope percent from total rise and a stated slope ratio. Planning geometry only — not an ADA approval.
Automated regression checks passed 2026-10-03 · independent external engineering review is not claimed. Two unit regression checks per calculator; additional known-answer cases cover selected formulas.
Baluster spacing
Baluster count and clear gap for a run between posts, using a maximum opening you can set. Default 4 in is the common sphere-rule planning figure, not a code stamp.
Automated regression checks passed 2026-10-03 · independent external engineering review is not claimed. Two unit regression checks per calculator; additional known-answer cases cover selected formulas.
Deck stain
Whole gallons of deck stain from deck area, coats and the coverage printed on the can.
Automated regression checks passed 2026-10-03 · independent external engineering review is not claimed. Two unit regression checks per calculator; additional known-answer cases cover selected formulas.
Epoxy floor
Whole gallons of floor epoxy from garage or shop area, coats and the labelled coverage.
Automated regression checks passed 2026-10-03 · independent external engineering review is not claimed. Two unit regression checks per calculator; additional known-answer cases cover selected formulas.
Drywall tape
Joint-tape rolls from net board area using a stated linear-feet-per-square-foot rule of thumb.
Automated regression checks passed 2026-10-03 · independent external engineering review is not claimed. Two unit regression checks per calculator; additional known-answer cases cover selected formulas.
Cement backer board
Cement-board sheet count from wet-area floor or wall coverage and the face of one sheet.
Automated regression checks passed 2026-10-03 · independent external engineering review is not claimed. Two unit regression checks per calculator; additional known-answer cases cover selected formulas.
Shiplap
Shiplap board count from wall width, height and the exposed face after overlap, rounded to whole sticks of the stock length you buy.
Automated regression checks passed 2026-10-03 · independent external engineering review is not claimed. Two unit regression checks per calculator; additional known-answer cases cover selected formulas.
House wrap
Weather-resistive-barrier roll count from wall perimeter, height, opening deductions and the net coverage of one roll.
Automated regression checks passed 2026-10-03 · independent external engineering review is not claimed. Two unit regression checks per calculator; additional known-answer cases cover selected formulas.
Drip edge
Drip-edge piece count from eave run plus rake run, divided by the stock length you will buy.
Automated regression checks passed 2026-10-03 · independent external engineering review is not claimed. Two unit regression checks per calculator; additional known-answer cases cover selected formulas.
Fill dirt
Fill-dirt volume and tonnage from area and compacted depth, with swell sitting in the waste field.
Automated regression checks passed 2026-10-03 · independent external engineering review is not claimed. Two unit regression checks per calculator; additional known-answer cases cover selected formulas.
Wainscoting
Stock-length sticks of wainscot from room perimeter after door deductions, with the chair-rail height kept visible for area.
Automated regression checks passed 2026-10-03 · independent external engineering review is not claimed. Two unit regression checks per calculator; additional known-answer cases cover selected formulas.
Board and batten
Board count and batten count from wall width, the exposed board face and a batten at each joint including the ends.
Automated regression checks passed 2026-10-03 · independent external engineering review is not claimed. Two unit regression checks per calculator; additional known-answer cases cover selected formulas.
Soffit
Soffit panel count from eave length, soffit width and the face of one panel.
Automated regression checks passed 2026-10-03 · independent external engineering review is not claimed. Two unit regression checks per calculator; additional known-answer cases cover selected formulas.
Fascia
Fascia-board sticks from eave plus rake run, rounded to the stock length you will buy.
Automated regression checks passed 2026-10-03 · independent external engineering review is not claimed. Two unit regression checks per calculator; additional known-answer cases cover selected formulas.
Vapor barrier
Poly roll count from floor or crawl area and the net coverage of one roll after the labelled lap.
Automated regression checks passed 2026-10-03 · independent external engineering review is not claimed. Two unit regression checks per calculator; additional known-answer cases cover selected formulas.
Subfloor
Tongue-and-groove subfloor sheet count from floor area and the face of one panel.
Automated regression checks passed 2026-10-03 · independent external engineering review is not claimed. Two unit regression checks per calculator; additional known-answer cases cover selected formulas.
Landscape fabric
Weed-barrier roll count from bed area and the net coverage of one roll after overlap.
Automated regression checks passed 2026-10-03 · independent external engineering review is not claimed. Two unit regression checks per calculator; additional known-answer cases cover selected formulas.
Asphalt sealer
Whole gallons of driveway sealer from area, coats and the labelled coverage per gallon.
Automated regression checks passed 2026-10-03 · independent external engineering review is not claimed. Two unit regression checks per calculator; additional known-answer cases cover selected formulas.
Caulk and sealant
Cartridge count from joint run and the linear coverage printed for one tube at the bead you will gun.
Automated regression checks passed 2026-10-03 · independent external engineering review is not claimed. Two unit regression checks per calculator; additional known-answer cases cover selected formulas.
Acreage
Acres, square feet and hectares from a rectangular tract. Not a survey.
Automated regression checks passed 2026-10-03 · independent external engineering review is not claimed. Two unit regression checks per calculator; additional known-answer cases cover selected formulas.
Grade and slope
Slope percent, ratio and angle from rise and run. Planning geometry only — not a drainage design.
Automated regression checks passed 2026-10-03 · independent external engineering review is not claimed. Two unit regression checks per calculator; additional known-answer cases cover selected formulas.
Road base
Crusher-run or class II base volume and tonnage from driveway or pad area, compacted depth and supplier density.
Automated regression checks passed 2026-10-03 · independent external engineering review is not claimed. Two unit regression checks per calculator; additional known-answer cases cover selected formulas.
Downspout
Downspout count from eave length and spacing, plus the number of stock pieces for the drop to grade.
Automated regression checks passed 2026-10-03 · independent external engineering review is not claimed. Two unit regression checks per calculator; additional known-answer cases cover selected formulas.
Starter strip
Starter-shingle bundle count from total eave length and the linear coverage printed on the starter bundle.
Automated regression checks passed 2026-10-03 · independent external engineering review is not claimed. Two unit regression checks per calculator; additional known-answer cases cover selected formulas.
Ridge vent
Ridge-vent piece count from ridge length and the coverage of one vent section. Not a ventilation design.
Automated regression checks passed 2026-10-03 · independent external engineering review is not claimed. Two unit regression checks per calculator; additional known-answer cases cover selected formulas.
Foam board
Rigid-foam sheet count from wall area after openings and the face of one panel.
Automated regression checks passed 2026-10-03 · independent external engineering review is not claimed. Two unit regression checks per calculator; additional known-answer cases cover selected formulas.
Fence stain
Fence-stain gallons from run length, height, faces stained and labelled coverage.
Automated regression checks passed 2026-10-03 · independent external engineering review is not claimed. Two unit regression checks per calculator; additional known-answer cases cover selected formulas.
Fence gate
Gate kits, gate posts and latch hardware from opening count and width. Not a fence-run takeoff.
Automated regression checks passed 2026-10-03 · independent external engineering review is not claimed. Two unit regression checks per calculator; additional known-answer cases cover selected formulas.
Aluminum fence
Aluminum panels, posts and rails from run length, section width and a measured gate opening.
Automated regression checks passed 2026-10-03 · independent external engineering review is not claimed. Two unit regression checks per calculator; additional known-answer cases cover selected formulas.
Privacy fence
Solid privacy boards and posts from run length, board face and spacing. Picket-gap wood fence is a different count.
Automated regression checks passed 2026-10-03 · independent external engineering review is not claimed. Two unit regression checks per calculator; additional known-answer cases cover selected formulas.
Fence post caps
Post-cap count from the posts you will set, plus a visible spare allowance.
Automated regression checks passed 2026-10-03 · independent external engineering review is not claimed. Two unit regression checks per calculator; additional known-answer cases cover selected formulas.
Paint primer
Primer gallons from room walls, openings, coats and labelled primer coverage. Finish paint is a different tool.
Automated regression checks passed 2026-10-03 · independent external engineering review is not claimed. Two unit regression checks per calculator; additional known-answer cases cover selected formulas.
Exterior paint
Exterior-paint gallons from wall length, height, openings, coats and labelled coverage. Interior rooms use the paint calculator.
Automated regression checks passed 2026-10-03 · independent external engineering review is not claimed. Two unit regression checks per calculator; additional known-answer cases cover selected formulas.
Paint trim
Trim-paint gallons from linear footage, coats and labelled linear coverage per gallon.
Automated regression checks passed 2026-10-03 · independent external engineering review is not claimed. Two unit regression checks per calculator; additional known-answer cases cover selected formulas.
Vinyl siding
Vinyl-siding squares, starter pieces and J-channel from wall area after openings.
Automated regression checks passed 2026-10-03 · independent external engineering review is not claimed. Two unit regression checks per calculator; additional known-answer cases cover selected formulas.
Cut and fill
Cut volume, fill volume and net import or export from pad length, width and depths. Not a grading design.
Automated regression checks passed 2026-10-03 · independent external engineering review is not claimed. Two unit regression checks per calculator; additional known-answer cases cover selected formulas.
Dump truck loads
Whole dump-truck loads from a stated material volume and truck capacity.
Automated regression checks passed 2026-10-03 · independent external engineering review is not claimed. Two unit regression checks per calculator; additional known-answer cases cover selected formulas.
Concrete weight
Concrete tons from a stated volume and an editable density. Ready-mix yards stay the slab tool.
Automated regression checks passed 2026-10-03 · independent external engineering review is not claimed. Two unit regression checks per calculator; additional known-answer cases cover selected formulas.
Hip roof
Hip-roof area, squares and hip run from footprint, pitch and overhang. Gable shingles stay the roofing calculator.
Automated regression checks passed 2026-10-03 · independent external engineering review is not claimed. Two unit regression checks per calculator; additional known-answer cases cover selected formulas.
Snow load
Planning snow load in pounds from roof area and a stated ground snow load. Not a PE stamp.
Automated regression checks passed 2026-10-03 · independent external engineering review is not claimed. Two unit regression checks per calculator; additional known-answer cases cover selected formulas.
Self-leveling underlayment
Self-leveling bags from floor area, pour depth and the bag yield printed on the sack.
Automated regression checks passed 2026-10-03 · independent external engineering review is not claimed. Two unit regression checks per calculator; additional known-answer cases cover selected formulas.
Sonotube
Solid cardboard-tube volume, ready-mix order and bags. Post-hole annulus is a different tool when a post occupies the hole.
Automated regression checks passed 2026-10-03 · independent external engineering review is not claimed. Two unit regression checks per calculator; additional known-answer cases cover selected formulas.
3-4-5 check square
Diagonal of a rectangle so a layout can be squared in the field. Planning geometry only.
Automated regression checks passed 2026-10-03 · independent external engineering review is not claimed. Two unit regression checks per calculator; additional known-answer cases cover selected formulas.
Pipe volume
Pipe gallons and cubic feet from inside diameter and length. Not a flow or plumbing-code design.
Automated regression checks passed 2026-10-03 · independent external engineering review is not claimed. Two unit regression checks per calculator; additional known-answer cases cover selected formulas.
Furnace BTU
Planning heating load from floor area, ceiling height and a stated BTU per square foot. Not Manual J.
Automated regression checks passed 2026-10-03 · independent external engineering review is not claimed. Two unit regression checks per calculator; additional known-answer cases cover selected formulas.
CFM
Planning airflow from room volume and air changes per hour. Not a duct design or Manual D.
Automated regression checks passed 2026-10-03 · independent external engineering review is not claimed. Two unit regression checks per calculator; additional known-answer cases cover selected formulas.