Roof Pitch to Angle Calculator
The Roof Pitch to Angle Calculator converts the roof pitch given as a rise over 12 (e.g., 4 in 12) into its equivalent slope in degrees and percentage. This is essential for anyone needing to make precise framing cuts, design rafters, or understand the roof angle for installing materials such as solar panels or metal roofing.
To calculate the full length of a rafter using slope, try the
Common Rafter Length Calculator.
Need to measure roof area without climbing on it? Try the
Measuring a Roof Calculator
- it estimates total square footage and roofing squares from ground-level dimensions.
Planning a sheathing job for a gable roof? The
Gable Roof Sheathing Calculator
helps estimate total plywood sheets needed, including waste from cuts.
Roof Pitch to Angle
Calculator
- enter the rise in inches per foot
- number of decimals in the result
Results
- the angle of the roof in degrees
This tool is ideal for framers, builders, architects, or homeowners checking if a slope meets code or design preferences
How To Convert Roof Pitch in Degrees
You will need a scientific calculator to be able to complete this calculation.Example calculation
6 : 12 slope ratioformula used: atan(P/12)* 180/𝛑 where P = rise in inches
𝛑 = 3.14159
* 180/𝛑 = converting radians to degrees
6 ÷ 12 = 0.5
atan(0.5) * 180 ÷ 3.14159
0.463647609 * 180 ÷ 3.14159 = 26.56505°
A 4 : 12 pitch = 26.57°