RenoMetric
Construction Planning

Slope Calculator

Convert rise and horizontal run into slope percentage, ratio and angle.

Project inputs

Enter rise and run

Transparent formula

How slope is calculated

Slope percentage uses vertical rise divided by horizontal run. The angle uses the arctangent of the same ratio.

grade (%) = rise ÷ run × 100
angle = arctan(rise ÷ run)

Worked example

A 6 inch rise over a 120 inch horizontal run is a 5% grade and an angle of about 2.86°.

Planning only: ramp, drainage, roofing and accessibility requirements vary by location and project. Confirm the design against applicable codes and qualified guidance.