The Rise Over Run Calculator finds the slope of a line or surface as a ratio, percentage, and angle, from a rise and run measurement. It works for stairs, ramps, roads, roofs, or any incline. Simply fill in the fields above and click Calculate to get an instant result.
This calculator is part of Calculate Wiki’s Construction Calculators collection.
What You’ll Need
- Rise — the vertical change
- Run — the horizontal change (same units as Rise)
- Total Horizontal Distance — optional, to find total rise over a longer stretch
Formula Used
Slope (%) = (Rise ÷ Run) × 100
Angle = arctan(Rise ÷ Run)
Example Calculation
Using example inputs — Rise = 4; Run = 12 — the Rise Over Run Calculator returns:
| Value | Result |
|---|---|
| Slope ratio | 1 : 3 |
| Slope percentage | 33.33% |
| Angle | 18.43° |
33.33% slope, 18.43° angle.
Helpful Information
Results from the Rise Over Run Calculator are estimates based on standard formulas used in the construction calculators field. For projects with significant cost, safety, or structural implications, consider verifying results with a qualified professional.