Calculator
Convert Slope To And From Permille
Convert slope between permille, percent, ratio, and degrees. Useful for roads, rail, drainage, and trails.
Formula: permille slope = (rise / run) * 1000
Slope Permille Calculator
Enter rise and run to convert slope into permille, percent, and degrees.
Diagram updates from your rise and run values.
Percent
Degrees
Rise
Run
Calculation Work (Show Your Work)
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Summary: -
What Your Result Means
Your slope is shown as permille, percent, and degrees so you can use whichever standard your project needs. Rise and run must use the same unit for the conversion to be valid.
FAQ
- How steep is 10‰?
10‰ equals 1% grade and about 0.573 degrees. - Why use permille for slope?
It communicates small gradients clearly, especially in transport and infrastructure.