Slope Percentage Calculator
Slope is how steep a surface is. Enter how far it climbs and how far it runs flat, and this shows the grade as a percent and as an angle.
- Free
- Works offline after your first visit
- Saves on this device
- No sign-up
- Updated
How it works
The grade in percent is the rise divided by the run, times 100. A rise of one unit for every ten units along the run is a 10% grade.
The angle is the arctangent of the rise over the run, shown in degrees. A 100% grade is 45 degrees, because the rise and the run are then equal.
Worked example
A surface that rises 5 ft over a run of 100 ft has a grade of 5%, which is an angle of 2.9 degrees.
Questions
Is a grade the same as an angle?
No. They are different scales. A 10% grade is about 5.7 degrees, not 10 degrees.
What grade is allowed for a ramp?
That depends on the rule where you live. Many building rules set a maximum grade for ramps, and this calculator does not know yours. Check with your local building office.
Does the run have to be flat?
Yes. Measure the run level along the ground, not along the slope itself.
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