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Slope & gradient calculator
Compare gradient percentage, angle and rise-to-run ratio.
A clear answer. Here’s how.
Gradient = rise ÷ horizontal run × 100. Angle = atan(rise/run), converted to degrees. A non-zero rise is also shown as 1 vertical to |run/rise| horizontal. Negative rise indicates a fall. This does not assess accessibility or drainage compliance.
See a worked example
Worked example
A fixed demonstration, separate from the values you enter above.
- Vertical rise (signed)
- 1
- Horizontal run
- 20
Example result
- Gradient
- 5%
- Angle
- 2.86240522611°
- Vertical to horizontal
- 1 : 20
- Direction
- Rise