Free tool
Slope and grade converter
Convert a slope between percent, degrees, ratio and per mille. Or work out the rise or run.
Method and limits
- Slope = rise / run = tan(angle). Percent is slope x 100, per mille is slope x 1000, and the ratio is 1 in (run / rise). A negative value means a fall.
- Rise and run are the horizontal and vertical parts, not the slope length.
- Checked against 200 random slopes at high precision, including the round trip between percent and degrees.
- This tool is a convenience, not a survey deliverable. Check results against your own work, and use certified methods for anything you sign off. Provided as is, in line with the terms. Nothing you enter is sent anywhere.