🏠 Roofing Calculator
Building size and roof pitch
Building length
(add your eave overhang to your measurement if you have one)
Building width
Roof pitch
3 / 12 — shallow
4 / 12
5 / 12
6 / 12 — typical house
7 / 12
8 / 12 — steep
9 / 12
10 / 12
12 / 12 — 45 degrees
Waste allowance (%)
(extra for cuts, spills and uneven ground — 10% is the usual rule)
Calculate roofing
Calculator by
CalcCoverage
— free DIY & home-improvement calculators