Rise Over Run to Percent Slope Calculator

Convert a rise and run to a percent slope (grade).

⏱ Updated: 19 Sep 2026

Calculator

Free rise over run to percent slope calculator: convert a rise and run to a percent grade.

Percent Slope
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Enter a rise and run to calculate the percent slope, or grade.

How to Use the Rise Over Run to Percent Slope Calculator

Enter a rise and a run. The percent slope comes out below.

percent slope = (rise ÷ run) × 100

Percent slope — also called grade — is the unit road signs and hiking trail markers actually use, not degrees. A 100% grade sounds dramatic but is only a 45° angle (rise equals run); it's easy to mentally overestimate how steep a percentage grade is compared to a degree measurement, which is exactly the mismatch this calculator exists to translate between.