Slope Calculator: Percent Grade, Rise and Run, and H:V Ratio

Convert elevation change and horizontal distance into percent grade, slope angle, and horizontal-to-vertical ratio for preliminary lots, driveways and grading analysis.

Percent grade

Divide vertical change by horizontal distance and multiply by 100.

Horizontal-to-vertical ratio

A 3H:1V slope equals approximately 33.3 percent grade, not three percent.