Ramp Length Calculator
Enter the rise, the slope you want and the greatest rise of one run, and get the ramp length, the slope length, the angle, the runs and landings and the total length, set beside the values the 2010 ADA Standards quote.
Estimates for planning, not professional advice. Read the full notice.
Example: a thirty inch rise
1 ramp runs
- Run for the whole rise 30 ft
- Slope length 361.25 in
- Angle 4.76 degrees
- Slope as a percent 8.33 percent
- Landings 0 landings
Estimate for planning, from what you entered and the product data shown. Check product labels and your supplier before you buy.
Your project
Enter a size to see your total.
Each product is rounded up once for the whole project, so the total can be less than the items bought alone added together. A line counted from a cut layout (sheets, boards or tiles laid out piece by piece) is counted for each item and added.
Run, length, angle and runs
These numbers follow the sizes above for every item in the list. The comparisons are with the values quoted from the 2010 ADA Standards below; check local requirements.
Shopping list
| Item | Size | Buy |
|---|---|---|
| Ramp runs | ramp runs | 1 |
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Worked example: a thirty inch rise
Show the working
- Run: the rise times the run for each unit of rise 30 in × 12 = 360 in
- Slope length: the square root of the rise squared plus the run squared 30 in + 360 in = 361.25 in
- Runs: the rise over the greatest rise of one run, rounded up 30 in ÷ 30 in = 1 ramp run
Assumptions
The figures behind the example. Sourced figures link to their source below; a default is a starting value to check against your label or supplier.
| Assumption | Value | Details and changes |
|---|---|---|
| Running slope, 2010 ADA Standards section 405.2: run for each unit of rise | 12 to 1[1] | |
| The 2010 ADA Standards, section 405: a ramp run has a running slope not steeper than 1:12, a rise of 30 inches maximum, a clear width of 36 inches minimum and a landing clear length of 60 inches minimum. | ||
| Rise of one run, 2010 ADA Standards section 405.6, maximum | 30 in[1] | |
| The 2010 ADA Standards, section 405: a ramp run has a running slope not steeper than 1:12, a rise of 30 inches maximum, a clear width of 36 inches minimum and a landing clear length of 60 inches minimum. | ||
| Clear width, 2010 ADA Standards section 405.5, minimum | 36 in[1] | |
| The 2010 ADA Standards, section 405: a ramp run has a running slope not steeper than 1:12, a rise of 30 inches maximum, a clear width of 36 inches minimum and a landing clear length of 60 inches minimum. | ||
| Landing length, 2010 ADA Standards section 405.7.3, minimum | 60 in[1] | |
| The 2010 ADA Standards, section 405: a ramp run has a running slope not steeper than 1:12, a rise of 30 inches maximum, a clear width of 36 inches minimum and a landing clear length of 60 inches minimum. | ||
Feet and inches, like 12' 6"
Run and length by rise
Run, slope length, runs, landings and total length for six rises at the starting slope, greatest rise and landing length
| Rise | Run | Slope length | Runs | Landings | Total length with landings |
|---|---|---|---|---|---|
| 6 in | 6 ft | 72.2 in | 1 runs | 0 landings | 6 ft |
| 12 in | 12 ft | 144.5 in | 1 runs | 0 landings | 12 ft |
| 18 in | 18 ft | 216.7 in | 1 runs | 0 landings | 18 ft |
| 24 in | 24 ft | 289 in | 1 runs | 0 landings | 24 ft |
| 30 in | 30 ft | 361.2 in | 1 runs | 0 landings | 30 ft |
| 36 in | 36 ft | 433.5 in | 2 runs | 1 landings | 41 ft |
Each row is worked out on its own. The total length is the runs and the landings laid end to end, level distance.
Questions
What slope does a ramp have?
The 2010 ADA Standards, section 405.2, says "Ramp runs shall have a running slope not steeper than 1:12." The calculator takes the slope you choose and compares it with that value. Check local requirements.
How long is a ramp for a 24 inch rise?
At a slope of 1:12 a rise of 24 inches has a run of 24 feet. The slope you choose may differ, and the calculator works out the run for it; the 2010 ADA Standards value is quoted in the assumptions. Check local requirements.
How many runs and landings does a higher ramp take?
The 2010 ADA Standards, section 405.6, says "The rise for any ramp run shall be 30 inches (760 mm) maximum." and section 405.7.3 says "The landing clear length shall be 60 inches (1525 mm) long minimum." A higher rise is split into equal runs with a landing between each pair. Check local requirements.
Sources (1)
-
2010 ADA Standards for Accessible Design, section 405 Ramps (opens in new tab), U.S. Access Board, 2010 ADA Standards.
Code or government.
“Ramp runs shall have a running slope not steeper than 1:12.”
“The rise for any ramp run shall be 30 inches (760 mm) maximum.”
“The clear width of a ramp run and, where handrails are provided, the clear width between handrails shall be 36 inches (915 mm) minimum.”
“The landing clear length shall be 60 inches (1525 mm) long minimum.”
Checked November 12, 2026. Figures and codes change; verify with the source. Back to where this is used (Source 1)
These are summaries of what the sources say, not professional advice. Codes and product data change. Check with your building department and the product label about your own project.
Sources
- [1] U.S. Access Board, 2010 ADA Standards for Accessible Design, section 405 Ramps. Checked November 12, 2026. https://www.access-board.gov/ada/