Ramp Calculator

Find ramp length for a rise at a given slope.

Ramp length 1

Ramp run 12

Formula: run = rise × slope ratio

Step-by-step with your numbers:

1. Values used:

2. Rise (height) = 1

3. Slope ratio (1 : X) = 12

5. Ramp length = 1

6. Ramp run = Rise (height) x Slope ratio (1 : X) = 1 x 12 = 12

Did we solve your problem today?

Find the ramp length for a step or threshold at a chosen slope.

The math behind it

horizontal run = rise × slope ratio. ADA accessibility requires at most 1:12 (1 in rise per 12 in run).

24 in rise at 1:12 → 24 ft run.

ADA slope?

Maximum 1:12 for wheelchair ramps; gentler is better.