Calculators
Accessible Ramp Calculator
Calculate wheelchair ramp length, intermediate landings and total length from the rise and slope, with key clearance figures.
- Runs in your browser
- Nothing uploaded
The tool
Enter your numbers below. Results update as you type, and nothing leaves your browser.
Everything you enter stays on your own machine. Nothing is sent to us or to anyone else, which you can confirm in your browser network tab.
What people use it for
- Planning a wheelchair ramp
- Checking a design against accessibility standards
- Estimating ramp materials
- Accessibility audits
About this tool
What the Accessible Ramp Calculator does
Accessible ramps limit how steep and how long each run can be. Under the US ADA Standards, the steepest slope allowed is 1:12, with a maximum rise of 30 inches per run before a level landing at least 60 inches long. This calculator lays out the ramp for your rise.
It also works as a accessibility clearance calculator or a ADA ramp calculator.
Formula
- Ramp length = rise × slope ratio (12 for 1:12)
- Runs = rise ÷ maximum rise per run (rounded up)
- Total = ramp length + landings × landing length + top and bottom landings
Worked example
Using the starting values in the calculator above:
| Input | Value |
|---|---|
| Total rise | 24 in |
| Slope | 1:12 (steepest allowed) |
| Maximum rise per run | 30 in |
| Landing length | 60 in |
| Result | Value |
|---|---|
| Ramp length (sloped sections) | 24.0 |
| Total length with top, bottom and intermediate landings | 34.0 |
| Ramp runs | 1 |
| Intermediate landings | 0 |
| Slope angle | 4.76 |
How to read the result
A gentler 1:16 or 1:20 slope is much easier for many users, at the cost of a longer ramp.
Handrails, edge protection and landing size at turns also have requirements; check the standards that apply in your jurisdiction.
Based on the 2010 US ADA Standards. Check the accessibility rules that apply to your project.
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Questions
Questions about this tool
The things clients actually want to know — costs, timelines, ownership and what happens after launch.
At a 1:12 slope, one foot of ramp for every inch of rise, so a 24 inch rise needs a 24 foot ramp.
Under the ADA Standards, at the top and bottom and after every 30 inches of rise.
Other countries have their own standards with similar but not identical figures.
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