Roof Pitch ↔ Angle Converter
Convert roof pitch to degrees, or degrees to pitch
Choose the direction, then enter a value. Angles are measured from horizontal; pitch is the rise for a 12-inch horizontal run. For example, a 6:12 pitch is about 26.57°. Select any pitch in the reference table to load it.
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Convert pitch to angle
Select Roof pitch → Angle and enter only the rise number. For a 9.5:12 pitch, enter 9.5. The run is fixed at 12. A pitch of 0:12 is level.
Formula: angle = arctangent(pitch ÷ 12), in degrees.
Convert angle to pitch
Select Angle → Roof pitch and enter the angle from horizontal. For example, 30° gives about 6.928:12, not exactly 7:12. Supported angles are 0° to less than 90°.
Formula: pitch = 12 × tangent(angle).
Read the diagram & table
The horizontal leg is a 12-inch run, the vertical leg is the rise, and the red line shows the roof angle.
Slope percentage = pitch ÷ 12 × 100. A 12:12 pitch is a 100% slope and a 45° angle, not 90°.
Use the calculated value
Values are rounded for readability, but the converter does not round to the nearest whole-number pitch. Small differences may affect bracket fit.
Confirm the measured roof angle, bracket drawing and product requirements before ordering. Use plans or measurements taken safely by a qualified professional; do not climb onto a roof to measure.