How to use this calculator
Estimate roof area, pitch-adjusted area, waste, and roofing squares.
How the calculation works
- Enter the project dimensions or quantities.
- Choose the unit and optional waste factor where relevant.
- Review the rounded material estimate and supporting details.
Formula
Roof area = plan area x pitch multiplier.
Example
A 30 ft by 20 ft roof section with 6:12 pitch uses a multiplier of about 1.118.
Understanding your result
Use the output as a practical starting point, then review it before using it in an important workflow.
Assumptions and limitations
- This is not structural engineering or code compliance advice.
Frequently asked questions
Does this require an account?
No. The core tool works without creating a Tool2Do account.
Is my input included in share links or analytics?
No. Tool2Do share actions use the tool page URL and safe metadata, not private values or uploaded files.