How to use this calculator
- 01Measure vertical rise and horizontal run with the same unit.
- 02Use a negative rise if the endpoint is lower.
- 03Calculate, then compare the result with project requirements and verified elevations.
Assumptions and limitations
What the estimate assumes
- Run is horizontal distance, not distance along the ground.
- The slope is constant between measurement points.
- Rise and run use the same unit.
What it does not determine
- This is not a survey, drainage design, or code-compliance determination.
- Small measurement errors can materially change short-run results.
- Steep slopes, walls, structures, utilities, and accessible routes require qualified review.
Frequently asked questions
How is percent grade calculated?
Percent grade equals rise divided by horizontal run, multiplied by 100.
Is a 10% slope the same as 10 degrees?
No. A 10% slope is about 5.7 degrees.
What does a negative result mean?
It means the measured endpoint falls relative to the starting point.