Construction
Roof Slope Percentage Calculator
Calculate roof slope as a percentage from rise and run.
- Free to use
- Runs in your browser
- Level B · Industry formula
- Last reviewed 2026-08-16
Calculator guide
How to use the Roof Slope Percentage Calculator
Calculate roof slope as a percentage from rise and run. Enter the requested values and select Calculate. The result and supporting values are produced locally in your browser.
Formula
Worked example
A 6-unit rise over a 12-unit run is a 50% roof slope.
What to keep in mind
- Rise and run must use the same unit.
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 slope as a percentage from rise and run.
How is the result calculated?
Roof Slope % = Rise ÷ Run × 100.
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.