Construction
Roof Pitch Calculator
Calculate roof pitch in rise-per-12 form, along with slope percentage and angle.
- Free to use
- Runs in your browser
- Level B · Industry formula
- Last reviewed 2026-08-16
Calculator guide
How to use the Roof Pitch Calculator
Calculate roof pitch in rise-per-12 form, along with slope percentage and angle. Enter the requested values and select Calculate. The result and supporting values are produced locally in your browser.
Formula
Worked example
A roof rising 6 units over a 12-unit run has a 6:12 pitch, a 50% slope, and an angle of about 26.57°.
What to keep in mind
- Use the same unit for rise and run.
- Roof pitch describes roof steepness; local roofing practices may use additional conventions.
Methodology
This calculator uses deterministic arithmetic and performs the calculation locally in your browser. Verify assumptions, units, and source values for your specific use case.
Review standard: Level B · Industry formula. How calculator reviews work.
Frequently asked questions
What does this calculator calculate?
Calculate roof pitch in rise-per-12 form, along with slope percentage and angle.
How is the result calculated?
Pitch per 12 = Rise ÷ Run × 12.
Can I use the result for an important decision?
Use the result as a calculation aid and verify the inputs, assumptions, and applicable professional or regulatory requirements before relying on it for an important decision.
Does CalculateMeasure store the values I enter?
The calculator performs its arithmetic in your browser. The calculator itself does not need to send your entered values to a server to produce the result.