Roof Pitch Converter
Convert a roof slope between rise-in-12 (like 6:12), angle in degrees, and percent grade.
Rise per 12" of run. Accepts 6, 7.5, or a ratio like 6:12 or 6/16.
Pitch (rise-in-12)6:12
Angle26.6°
Grade (slope)50%
Pitch, angle, and grade
Roof slope is usually written as rise-in-12 — a
6:12 roof climbs 6" of rise for every 12" of horizontal run.
That same slope can be expressed as an angle from
horizontal or a percent grade:
- Angle =
atan(rise ÷ run)— a 6:12 roof is about 26.6°. - Grade =
rise ÷ run × 100— a 6:12 roof is a 50% grade. - A 12:12 roof is exactly 45° and 100%.
Enter a pitch as a single number (6, 7.5) or a
ratio (6:12, even an off-12 run like 6/16), or
switch the input to degrees or percent to convert the other way.