A percentage grade is the rise divided by the run × 100; degrees is the angle. They aren't linear — a 100% slope is 45°, not 90°. This tool applies the arctangent to convert correctly.
For the site
Measure the grade.
Digital angle finder
Read slope in degrees.
Laser level
Set accurate grades.
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Frequently asked questions
Is 100% slope the same as 90 degrees?
No — a 100% grade is 45°. Grade is rise/run, so equal rise and run gives 45°.
What is the formula?
degrees = arctan(percent ÷ 100), converted from radians.