Fence on a Slope Calculator
Plan a fence on sloping ground: slope, length and the drop at each post.
Your result
Enter your numbers and press the button. Your result appears here.
On a slope you can step the fence (level sections that drop at each post) or rack it (sections that follow the ground).
How the slope is worked out
Slope = height change ÷ horizontal run. Length along the ground = √(run² + rise²). Step per section = height change ÷ number of sections.
Example: a 80 ft run that drops 6 ft is a 7.5% slope. Stepped in 8 ft sections, each section drops 7.2 in.
Slope by height change at a glance
Worked out with the same settings as the calculator above, changing only the height change.
| Height change | Slope | Along the ground | Step per section |
|---|---|---|---|
| 2 ft | 2.5% | 80.0 ft | 2.4 in |
| 4 ft | 5.0% | 80.1 ft | 4.8 in |
| 6 ft | 7.5% | 80.2 ft | 7.2 in |
| 8 ft | 10.0% | 80.4 ft | 9.6 in |
| 12 ft | 15.0% | 80.9 ft | 14.4 in |
Common questions
Stepped or racked?
Stepped fences have level sections that drop at each post and leave triangular gaps underneath. Racked fences follow the ground but need panels or pickets that can be angled.
Do I need more fence on a slope?
Slightly. The length along the ground is longer than the flat distance, though the difference is small on gentle slopes.