FREE TOOL
Slope Calculator (Percent, 1:n, Degrees)
Enter the height difference and horizontal distance to get the slope as a percentage, 1:n and degrees, plus the sloped length.
How to use this tool
- Enter the height difference in metres between the start and end of the line.
- Enter the horizontal distance between them in metres, not the sloped length.
- Press Calculate to see the result in percent, 1:n and degrees.
FAQ
How do I calculate slope as a percentage?
Divide the height difference by the horizontal distance, then multiply by 100. For example, 1 m over 20 m is 5%.
Is 100% the same as 90 degrees?
No. A 100% slope is 45 degrees, because the height difference equals the horizontal distance.
What slope suits a drain or road?
It depends on the size, design and applicable code. This tool only does the calculation; the design engineer sets the required value.