About this tool
Convert a roof’s rise and run into pitch (x/12), angle, slope percentage and rafter length.
Pitch = rise ÷ run × 12, angle = atan(rise ÷ run), slope % = rise ÷ run × 100, rafter = √(rise² + run²).
Formula: θ = atan(rise/run)
Example: Rise = 6, Run = 12 → Pitch (x in 12) = 6, Angle (degrees) = 26.57.
The rafter length excludes overhang. Use any unit as long as rise and run match.
Quick steps
- Enter your values — every field shows its unit.
- Press Calculate (or Try an example to see how it works).
- Read the results and copy them if you need them elsewhere.
The calculation runs in your browser. Nothing you type is sent to 1CLIK.
FAQ
How does the Roof Pitch Calculator work?
Pitch = rise ÷ run × 12, angle = atan(rise ÷ run), slope % = rise ÷ run × 100, rafter = √(rise² + run²).
What should I keep in mind?
The rafter length excludes overhang. Use any unit as long as rise and run match.
Is my data sent anywhere?
No. The numbers stay on your device; the page only shows the result.