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.
13 tested tools in exterior
Exterior calculators
Turn wall and gable measurements into siding squares, vinyl starter, J-channel and insulation packages with openings and cut allowance visible.
Formula-first tool library
Choose the right exterior calculator.
Siding calculator
Wall and gable siding area after openings, then squares and coverage units with a visible allowance.
Open calculatorInsulation calculator
Batt or roll count from net coverage area, product coverage and a visible cutting allowance.
Open calculatorBlown-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.
Open calculatorStucco calculator
Stucco bag count from net wall area, number of coats and the selected bag's coverage per coat.
Open calculatorGutter calculator
Gutter and downspout piece counts from eave length, stock piece length and downspout runs.
Open calculatorHouse wrap calculator
Weather-resistive-barrier roll count from wall perimeter, height, opening deductions and the net coverage of one roll.
Open calculatorBoard and batten calculator
Board count and batten count from wall width, the exposed board face and a batten at each joint including the ends.
Open calculatorSoffit calculator
Soffit panel count from eave length, soffit width and the face of one panel.
Open calculatorFascia board calculator
Fascia-board sticks from eave plus rake run, rounded to the stock length you will buy.
Open calculatorVapor barrier calculator
Poly roll count from floor or crawl area and the net coverage of one roll after the labelled lap.
Open calculatorDownspout calculator
Downspout count from eave length and spacing, plus the number of stock pieces for the drop to grade.
Open calculatorFoam board calculator
Rigid-foam sheet count from wall area after openings and the face of one panel.
Open calculatorVinyl siding calculator
Vinyl-siding squares, starter pieces and J-channel from wall area after openings.
Open calculatorCommon question
Is a siding square 100 square feet?
These are transparent planning aids, not engineering, code, installation or final supplier specifications. Confirm actual job requirements before construction.