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.
Percent
Degrees
What Your Result Means
Permille is a precision-friendly way to represent ratios out of 1,000. Use it when percent feels too coarse or when per-thousand language is standard for your topic.
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.