Roof Pitch Percentage
Use the Roof Pitch Percentage for roofing planning. Enter Rise (in) and Run (in) to get a clear result, formula explanation, and practical checks.
Roof Pitch Percentage measurements
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Result
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CategoryConstruction
Inputs2
CalculationIn browser
How to calculate roof pitch percentage
This calculator finds roof pitch as a percentage by dividing rise by run.
How the calculation works
Pitch percentage = (Rise ÷ Run) × 100.
Example
A rise of 6 inches over a 12-inch run: (6÷12)×100 = 50%.
Frequently asked questions
How is Result calculated?
Result = ([Rise] ÷ [Run]) × 100.
Is the Roof Pitch Percentage free to use?
Yes — every calculator on Simple Calculator Tools is free, runs in your browser, and does not require an account.
Quick Insight
Roof Pitch Percentage
Pitch percentage = (Rise ÷ Run) × 100.
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Your personalized explanation
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Pro Tips for Roof Pitch Percentage
- Roof pitch percentage and the more common ratio format (like 6:12) both describe the same slope, just expressed differently — a 6:12 pitch equals 50%.
- Keep rise and run in the same unit before dividing, since the ratio determines the pitch percentage.
Common Roof Pitch Percentage Mistakes to Avoid
- Mixing rise and run units without converting to a consistent unit first, which would produce an incorrect pitch percentage.
When to Use This Calculator
This calculator finds roof pitch as a percentage by dividing rise by run.
Content reviewed: August 2026 · Robert Threadgill