Real sloped roof area, pitch, ridge height and tiles or sheets for a gable, hip or flat roof.
How this works
Sloped area = flat plan area (with overhang) / cos(pitch). A 30° roof is 15% bigger than its plan. Ridge rise = half the width x tan(pitch) for a gable or hip. Concrete roof tiles cover about 10 per m².
Questions people ask
How do I use the Roof Area and Pitch Calculator?
Fill in the fields, starting with “Building length”, “Building width” and “Roof type”, and change any other options that match your home. The answer, a drawing and practical tips update as you type, and the Copy link button saves your numbers in a link you can share.
Is the Roof Area and Pitch Calculator free?
Yes. The Roof Area and Pitch Calculator is free, with no sign-up, and works on phones, tablets and computers. The results are estimates to help you plan, so check with a qualified professional before structural, electrical, gas or plumbing work.