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Use our ADA Ramp Calculator to estimate ramp run, slope, and rise. Plan ramp space and review key ADA dimensions with a simple example.
| Provision | Requirement | Section |
|---|---|---|
| Max Running Slope (standard) | 1:12 (8.33%) | 405.2 |
| Max Rise per Run | 30 in (760 mm) | 405.6 |
| Min Landing Length | 60 in (1,525 mm) | 405.7 |
| Max Cross Slope | 1:48 (~2.08%) | 405.3 |
| Min Clear Width | 36 in (915 mm) | 405.5 |
| Existing-Site Exception | 1:10 for max 6 in rise; 1:8 for max 3 in rise | 405.2 Exception |
Need a ramp for a home, shop, or public space? An ADA Ramp Calculator can help you find the ramp run from the height you need to cover. Enter the rise, choose a unit, and check the result. You’ll get a clear estimate of the ramp length and slope.
The tool helps with early planning. It does not prove that a ramp meets every ADA rule.
For a standard ADA ramp, the steepest allowed slope is 1:12. This means each inch of rise needs 12 inches of horizontal run.
ADA ramp run = vertical rise × 12
For example, a 24-inch rise needs 288 inches of run, or 24 feet.
Ramp slope (%) = (vertical rise ÷ horizontal run) × 100
A 1:12 slope is about 8.33%. Keep the rise and run in the same unit before you divide.
The standard max rise for one ramp run is 30 inches. A ramp also needs landings at the top and bottom. Each landing must be at least 60 inches long. The clear ramp width must be at least 36 inches. The max cross slope is 1:48, or about 2.08%.
Some existing sites may qualify for a steeper slope. A 1:10 slope may be allowed for a rise up to 6 inches. A 1:8 slope may be allowed for a rise up to 3 inches. These are limited cases, not the rule for new work. Check the ADA rules before you use an exception.
Enter the total rise from the lower floor to the upper floor.
Pick the unit, such as inches, feet, mm, or meters.
Choose standard slope unless your site meets an allowed exception.
Add the space you have and the ramp width, if you know them.
Select Calculate. Review the ramp run, slope, run count, and any warnings.
Say your doorway is 24 inches above the ground. Use the standard 1:12 slope.
Ramp run = 24 × 12 = 288 inches.
Convert inches to feet: 288 ÷ 12 = 24 feet.
Slope = (24 ÷ 288) × 100 = 8.33%.
So, the sloped ramp run is 24 feet. This length does not include the top and bottom landings. The final layout may need more space for landings and turns.
An ADA Ramp Calculator gives you a fast way to estimate ramp length and slope. Use it to plan your space before work begins. Then check the full layout, landings, width, handrails, edge protection, and local rules. A good estimate is a useful start, not a promise of full compliance.
At a 1:12 slope, each inch of rise needs 12 inches of run. A 24-inch rise needs 24 feet of run.
The standard maximum running slope is 1:12, or about 8.33%.
No. The ramp run is the sloped part. Landings are separate and add to the space you need.
Only in limited cases allowed by the ADA rules. Check the rise limit and site conditions first.
No. It estimates key dimensions. A full check must cover all rules that apply to the site.