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Roof Pitch to Angle Chart
Roof pitch is written as rise-over-run (like 6/12), but you often need it as an angle in degrees, a percentage slope, or a pitch multiplier for estimating roof area. This chart gives all four for every common pitch.
Full pitch conversion chart
| Pitch (rise/12) | Angle (degrees) | Slope (%) | Pitch multiplier |
|---|---|---|---|
| 1/12 | 4.76° | 8.3% | 1.003 |
| 2/12 | 9.46° | 16.7% | 1.014 |
| 3/12 | 14.04° | 25.0% | 1.031 |
| 4/12 | 18.43° | 33.3% | 1.054 |
| 5/12 | 22.62° | 41.7% | 1.083 |
| 6/12 | 26.57° | 50.0% | 1.118 |
| 7/12 | 30.26° | 58.3% | 1.158 |
| 8/12 | 33.69° | 66.7% | 1.202 |
| 9/12 | 36.87° | 75.0% | 1.250 |
| 10/12 | 39.81° | 83.3% | 1.302 |
| 11/12 | 42.51° | 91.7% | 1.357 |
| 12/12 | 45.00° | 100.0% | 1.414 |
How the conversion works
Pitch is rise over run. The angle is the arctangent of that ratio: for 6/12, arctan(6÷12) = arctan(0.5) = 26.57°. The percentage slope is just rise ÷ run × 100 (6/12 = 50%). The pitch multiplier is the length of the sloped surface per unit of horizontal run — the square root of (rise² + run²) ÷ run.
Measure your own pitch
To find your pitch, hold a level horizontally against the roof, measure 12 inches along it, then measure straight down to the roof surface — that drop in inches is your rise over 12. Or use the tool:
Frequently asked questions
What is 6/12 pitch in degrees?
26.57°, with a pitch multiplier of 1.118.
What is 4/12 pitch in degrees?
18.43°, multiplier 1.054.
What does the pitch multiplier do?
It converts flat footprint area into true sloped roof area — multiply footprint by the multiplier for material estimates.