Roofing Calculator
Estimate roof area from the building footprint and pitch.
Result
Results are estimates for general information only and are not professional advice.
Estimating roof area
A sloped roof has more surface than the ground it covers. This calculator multiplies your building footprint by a pitch factor to estimate the actual roof area, helping you order shingles or sheeting with a little extra for waste.
Frequently Asked Questions
What is the Roofing Calculator?
Estimate roof area from the building footprint and pitch. It runs instantly in your browser and is completely free to use.
What do I need to enter to use the Roofing Calculator?
The Roofing Calculator asks for the following values (2): Footprint area (m²), Roof pitch. Fill them in and the result appears immediately — the calculation runs on your own device, so nothing you type is sent to a server.
How accurate is the Roofing Calculator?
The Roofing Calculator uses standard, widely-accepted formulas, so its figures are reliable estimates for everyday planning. They are not a substitute for advice from a qualified professional.
Is the Roofing Calculator free, and do I need an account?
Yes. The Roofing Calculator — and every other calculator on Calculatis — is completely free, with no registration, no download and no limit on how often you use it.