Roof Covering Area Estimator
Convert flat projected area to one uniform roof slope area by dividing by cos(pitch), then add material allowance.
Enter your values
Your inputs are processed locally. Review the method and limitations before relying on the estimate.
Your result
How does Roof Covering Area Estimator work?
Convert flat projected area to one uniform roof slope area by dividing by cos(pitch), then add material allowance. Complex hips, dormers and overlaps must be measured.
Worked example
Use the prefilled scenario values, calculate the result and change a relevant input to see the result update.
Frequently asked questions
Does this fetch live prices or official rules?
No. It processes the quantities, assumptions and costs you supply. Verify any rules, conditions and rates with the relevant primary source.
Can I rely on this for safety or legal compliance?
No. It provides a bounded arithmetic planning scenario, not professional approval, contract advice or equipment certification.