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Slope calculator (%, ‰, degrees)
Enter the horizontal length and the height difference – or a target slope in percent to get the height difference you need.
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🔒 Runs entirely in your browser – nothing you enter is uploaded or stored.
How to use it
- Choose what you want to calculate.
- Enter length and height difference, or length and target slope.
- Read percent, per mille, degrees and cm per metre.
Last checked: October 2026 · Based on: Trigonometry; guide values DIN EN 12056 / DIN 1986-100, DIN 18040. Found a mistake? Use the form below – we fix confirmed errors and update the date.
Frequently asked questions
How do I calculate slope in percent?
Divide the height difference by the horizontal length and multiply by 100. 3 cm over 2 m = 0.03 ÷ 2 × 100 = 1.5 %.
What is 2 % slope in cm per metre?
2 cm per metre of horizontal length.
How many degrees is 100 % slope?
45°. Percent and degrees are not proportional: 10 % ≈ 5.7°, 50 % ≈ 26.6°.