Roof Pitch Calculator
Roof pitch is how steep a roof is. Enter the rise, how far the roof goes up, and the run, how far it goes across, to see the slope in standard terms.
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- Works offline after your first visit
- Saves on this device
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How it works
Pitch is the rise divided by the run, times 12, which gives inches of rise for every 12 inches across. The angle comes from the same ratio.
The area factor shows how much longer the roof surface is than the flat area under it. Multiply the flat area by it to estimate the roof's surface area.
Worked example
A rise of 6 in over a run of 1 ft makes a pitch of 6 per 12 inches, an angle of 26.6 degrees, and an area factor of 1.118.
Questions
What is a 6 in 12 roof?
It rises 6 inches for every 12 inches across. Pitch is often written this way.
Why multiply the flat area?
A sloped roof is longer than the floor under it. The area factor adds that extra length.
Does this include overhangs?
No. Add any overhang to the run if you want the full roof measured.
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