Roof Slope Calculator
Calculate the slope, angle, and pitch of a roof based on rise and run measurements. Useful for construction and roofing projects.
Published by:
isCalculator Editorial Team
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How to use this tool?
How to Use the Roof Slope Calculator
This calculator computes the slope, angle, and pitch of a roof from vertical rise and horizontal run.
- Enter the Rise – the vertical height (e.g., 6 inches or cm).
- Enter the Run – the horizontal length (use the same unit as rise, e.g., 12 inches or cm).
- Click "Calculate Slope" or press Enter.
Results:
- Slope (Ratio) – rise:run (e.g., 0.500:1).
- Angle (Degrees) – roof angle in degrees.
- Pitch – expressed as X:12 (e.g., 6:12 means 6 inches rise per 12 inches run).
Note: Use any unit (inches, cm) as long as both inputs are the same. Only positive numbers are accepted.
Previous Results
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Frequently Asked Questions
Roof slope is the steepness of a roof, typically expressed as a ratio of vertical rise to horizontal run (e.g., 6:12).
The roof angle in degrees is calculated using the arctangent of the rise divided by the run: angle = arctan(rise/run).
You can use any consistent unit (inches, centimeters, etc.) for both rise and run. The calculator works with any unit as long as they are the same.