Slope Grade Calculator
Grade is rise divided by run as a percentage. 100% equals 45°, and 8.33% (1:12) is the usual accessible-ramp standard.
Your numbers
Grade (%)
8.33%
Angle (°)
4.76°
Distance
12.042m
Formula
Grade (%) = Rise ÷ Run × 100
Grade and angle are not proportional — a 100% grade is 45°, not 90°.
What to enter
| Input | Default | Accepted range |
|---|---|---|
| Rise (m)How far it climbs, straight up. | 1 | 0 and up |
| Run (m)How far it travels horizontally. | 12 | 0 and up |
Step by step
Quick reference table
Results when only Run (m) changes and everything else stays put.
| Run (m) | Grade (%) (%) | Angle (°) (°) | Distance (m) |
|---|---|---|---|
| 6 | 16.67 | 9.46 | 6.083 |
| 9 | 11.11 | 6.34 | 9.055 |
| 12 | 8.33 | 4.76 | 12.042 |
| 18 | 5.56 | 3.18 | 18.028 |
| 24 | 4.17 | 2.39 | 24.021 |
What each result means
| Result | At default values |
|---|---|
| Grade (%) (%)How far you rise over 100 of horizontal run. | 8.33 |
| Angle (°) (°)An angle in degrees; a full turn is 360°. | 4.76 |
| Distance (m)The straight-line distance between two points. | 12.042 |
Common mistakes
Grade and angle are not proportional — a 100% grade is 45°, not 90°.
Glossary
- Rise
- How far it climbs, straight up.
- Run
- How far it travels horizontally.
- Grade (%)
- How far you rise over 100 of horizontal run.
- Angle (°)
- An angle in degrees; a full turn is 360°.
- Distance
- The straight-line distance between two points.
Frequently asked questions
Q. How is Slope Grade Calculator calculated?
Grade (%) = Rise ÷ Run × 100 — Grade is rise divided by run as a percentage. 100% equals 45°, and 8.33% (1:12) is the usual accessible-ramp standard.
Q. Can you walk through an example?
With Rise 1m, Run 12m, the answer is Grade (%) 8.33%.
Q. What do I need to enter?
Enter Rise, Run. The result recalculates as you type, and an empty box counts as zero.
Q. How much does the answer move if I change a number?
Changing only Run (m) moves the answer to Run (m) 6 → Grade (%) (%) 16.67 and Run (m) 24 → Grade (%) (%) 4.17. The table below lays out five steps.
Q. How are the numbers rounded?
Money is shown to the nearest whole unit, percentages to one decimal place and everything else to two. What you see is rounded; the calculation itself carries the unrounded value forward.
Q. Anything to watch out for?
Grade and angle are not proportional — a 100% grade is 45°, not 90°.
Related calculators
Keep your length units consistent across inputs — mixing centimetres and metres throws results far off.