About the Slope Percentage Calculator
Convert between slope percentage, degrees, ratio and rise over run for land, roads and ramps.
Also known as: grade to degrees, slope angle calculator, gradient calculator, percent grade, slope-percentage.
How to use this calculator
- Enter i know the and the other fields.
- The result updates instantly as you type — press Calculate (or Enter) at any time.
- Review the breakdown shown under the main result.
- Use Copy result or Share to save the answer or send a link with your inputs.
Formula
slope % = rise ÷ run × 100 · angle = arctan(rise/run)
Worked example
Using the values pre-filled in the calculator above:
- I know the: Rise and run
- Rise = 1.5 m
- Run = 10 m
the calculator returns:
- Slope percentage: 15 %
- Angle: 8.531 °
- Ratio: 1 in 6.67
- Rise per 10 m run: 1.5 m