What every result keeps visible
- Formula ID, version, internal QA status and planning boundary.
- Inputs, assumptions, allowance and purchase-rounding effect.
- Editable estimate costs that remain distinct from material quantity.
17 tested tools in concrete
Concrete calculators
Plan slab volume, rebar grids, sonotube piers, ready-mix orders, bag counts and concrete weight with waste, rounding and planning limits left visible.
Formula-first tool library
Choose the right concrete calculator.
Steel weight calculator
Rebar mass per metre, per bar and for a stated bar count from nominal diameter and steel density.
Open calculatorConcrete slab calculator
Volume, ready-mix order, and bag equivalent for a rectangle, circle, or L-shape.
Open calculatorConcrete footing calculator
Continuous footing volume, ready-mix quantity, and whole-bag equivalent.
Open calculatorConcrete wall calculator
Concrete wall volume with stated thickness, waste, and ready-mix rounding.
Open calculatorConcrete column calculator
Round concrete-column volume, ready-mix order and bag-equivalent estimate.
Open calculatorConcrete driveway calculator
Driveway volume, ready-mix order and bag-equivalent estimate with visible allowance.
Open calculatorConcrete patio calculator
Patio slab volume, ready-mix order and bag-equivalent estimate with visible allowance.
Open calculatorConcrete bag calculator
Slab volume translated into a whole-bag purchase quantity using the stated bag yield.
Open calculatorConcrete cost calculator
Preliminary material cost from a stated ready-mix quantity and local supplier rate.
Open calculatorRebar calculator
Preliminary slab rebar count, linear footage and bar-weight planning from spacing, cover and bar size.
Open calculatorPost hole calculator
Concrete volume and bag count for round fence or deck post holes, including solid sonotube piers when post diameter is zero.
Open calculatorConcrete mix calculator
Volumetric cement, sand and aggregate split from a known wet volume using a stated mix ratio and dry-volume factor.
Open calculatorConcrete stairs calculator
Triangular-step volume, ready-mix order and bag equivalent from riser, tread, width and count.
Open calculatorCurb and gutter calculator
Combined curb-and-gutter volume, ready-mix order and bag equivalent from run length and the two cross-section rectangles.
Open calculatorWire mesh calculator
Welded-wire mesh sheet count from slab area and the face coverage of one sheet, with overlap sitting in the waste field.
Open calculatorConcrete weight calculator
Concrete tons from a stated volume and an editable density. Ready-mix yards stay the slab tool.
Open calculatorSonotube calculator
Solid cardboard-tube volume, ready-mix order and bags. Post-hole annulus is a different tool when a post occupies the hole.
Open calculatorCommon question
Are concrete orders rounded?
These are transparent planning aids, not engineering, code, installation or final supplier specifications. Confirm actual job requirements before construction.