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.
16 tested tools in roofing
Roofing calculators
Move from gable or hip geometry and pitch into shingles, metal panels, underlayment, flashing, waste and a planning snow load without hiding the inputs.
Formula-first tool library
Choose the right roofing calculator.
Waterproofing membrane calculator
Membrane roll quantities with explicit side and end laps, layers, upstand area and cutting allowance.
Open calculatorRoofing calculator
Pitched roof area, squares, type-specific shingle bundles and underlayment rolls.
Open calculatorRoof pitch calculator
Roof pitch multiplier and slope angle from rise per 12 units of run.
Open calculatorMetal roof calculator
Pitched roof area and whole fixed-panel quantity using net area per selected panel.
Open calculatorRoofing underlayment calculator
Pitched roof area and whole underlayment-roll quantity using stated roll coverage.
Open calculatorRoof flashing calculator
Whole flashing-piece quantity from required linear coverage and a visible allowance.
Open calculatorRoofing waste calculator
Add a stated roofing waste allowance to an independently measured roof area.
Open calculatorRoofing cost calculator
Preliminary roofing material cost from stated area, allowance and user-entered local rate.
Open calculatorRidge cap calculator
Hip and ridge cap bundles from measured ridge and hip length plus the selected bundle's linear coverage.
Open calculatorIce and water shield calculator
Self-adhered ice-and-water roll count from eave length, coverage up the roof and valley length.
Open calculatorRoof sheathing calculator
Plywood or OSB sheet count from roof footprint, pitch multiplier and sheet coverage.
Open calculatorDrip edge calculator
Drip-edge piece count from eave run plus rake run, divided by the stock length you will buy.
Open calculatorStarter strip calculator
Starter-shingle bundle count from total eave length and the linear coverage printed on the starter bundle.
Open calculatorRidge vent calculator
Ridge-vent piece count from ridge length and the coverage of one vent section. Not a ventilation design.
Open calculatorHip roof calculator
Hip-roof area, squares and hip run from footprint, pitch and overhang. Gable shingles stay the roofing calculator.
Open calculatorSnow load calculator
Planning snow load in pounds from roof area and a stated ground snow load. Not a PE stamp.
Open calculatorCommon question
Do these tools design a roof?
These are transparent planning aids, not engineering, code, installation or final supplier specifications. Confirm actual job requirements before construction.