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Slope Grade, Angle & Ratio Converter
Convert among percent grade, degrees, 1:n slope ratio, and rise per metre.
GUIDE
How to use Slope Grade, Angle & Ratio Converter
Convert among percent grade, degrees, 1:n slope ratio, and rise per metre. The tool is available directly in your browser with no account required.
- 1. Enter the required value, text, or file in the tool above.
- 2. Adjust any available options and run the tool when needed.
- 3. Review the result and copy or download it if the tool provides that option.
DETAILS
Grade, angle, and 1:n slope relationship
Percent grade is vertical rise divided by horizontal run times 100. Angle uses arctangent, while 1:n expresses one unit of rise over n units of horizontal run.
8.33% example
An 8.33% grade rises about 83.3 mm per horizontal metre. It is about 4.76ยฐ or approximately 1:12.
Good to know
Calculations use horizontal run, not sloped length. Verify regulations for ramps, roofs, drainage, and vehicle access.
Frequently asked questions
Is a 45-degree slope equal to 45%?
No. A 45-degree slope is a 100% grade.
What percent is a 1:12 slope?
One divided by twelve times 100 is approximately 8.33%.
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