Estimate roof surface area from footprint and pitch.
Quick planning, rough comparisons, and checking whether your assumptions are in the right range before you rely on final quotes or advice.
Review the assumptions below, then compare with related calculators if your decision depends on rates, eligibility, or provider-specific rules.
How this calculator works
- Base area is adjusted by the cosine of the roof pitch.
- Steeper roofs have more surface area than the footprint.
- This suits simplified gable-style estimates.
Worked example
A steeper roof needs more covering material than the flat footprint alone suggests.
Important assumptions
- Complex hips, dormers, and valleys are not modeled.
- Pitch is assumed consistent across the roof.
FAQ
Are these calculators free?
Yes. lankacalculator tools are free to use and designed to be quick to access without sign-up.
How accurate are the results?
The calculators use clear assumptions and formulas, but results are estimates and should be checked against official documents or provider terms.
Can I use this on mobile?
Yes. The layout is built to work cleanly on phones, tablets, and desktops.
Do you store my inputs?
No account is required for these tools, and calculator inputs are not stored as user profiles in this v1 setup.