Wheelchair Ramp Table: Ramp surface length by Rise (height to climb)
Reference table of ramp surface length for Wheelchair Ramp across a range of rise (height to climb) values — exact, engine-computed figures you can read off at a glance.
Wheelchair Ramp Calculator
Verified formula Updated Jun 2026 Private — runs on your device
Verified formula
Private
Ramp surface length
289.00
- Horizontal run needed
- 288.00
For general information only — not financial, tax, legal or medical advice. Verify before you rely on it.
How to use the Wheelchair Ramp Calculator
The Wheelchair Ramp Calculator works out your ramp surface length, along with 1 related figure in an instant. Enter rise (height to climb) and slope ratio (1 in x) and the result updates as you type — it is free, needs no sign-up, and runs entirely in your browser so your figures stay private.
- Enter the rise (height to climb).
- Enter the slope ratio (1 in x).
- Read off your ramp surface length, together with horizontal run needed — the calculator updates automatically, with no button to press.
Formula
The Wheelchair Ramp Calculator uses the formula:
Ramp surface length = √(Rise (height to climb) ^ 2 + (Rise (height to climb) × Slope ratio (1 in X)) ^ 2)
Worked example
For example, with rise (height to climb) of 24 in and slope ratio (1 in x) of 12, the ramp surface length is 289.00.
| Rise (height to climb) | 24 in |
|---|---|
| Slope ratio (1 in X) | 12 |
| Ramp surface length | 289.00 |
|---|---|
| Horizontal run needed | 288.00 |
Results are estimates for educational use, not professional advice.
Key terms explained
- Slope
- The steepness of a line, measured as the change in y divided by the change in x.
- Ratio
- A comparison of two quantities showing how many times one contains the other.
Frequently asked questions
A common accessibility slope is 1 in 12, meaning 12 inches of run for every inch of rise. A 24-inch rise needs 288 inches (24 feet) of run.
The run is the horizontal distance on the ground; the ramp length is the sloped surface itself, which is slightly longer.
1 in 12 is the widely recommended maximum for accessible ramps. Gentler slopes like 1 in 16 or 1 in 20 are easier to use.
Yes, but it is harder and less safe to use. Balance the space available with a slope that remains comfortable and compliant.
The Wheelchair Ramp Calculator uses the formula: Ramp surface length = √(Rise (height to climb) ^ 2 + (Rise (height to climb) × Slope ratio (1 in X)) ^ 2). For example, with rise (height to climb) of 24 in and slope ratio (1 in x) of 12, the ramp surface length is 289.00.
Enter the rise (height to climb). Enter the slope ratio (1 in x). Read off your ramp surface length, together with horizontal run needed — the calculator updates automatically, with no button to press.
Related guides
How to Calculate Wheelchair Ramp: Formula, Steps & Examples
Learn how to calculate Wheelchair Ramp — the formula explained step by step, with worked examples and a free calculator to check your answer.