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Calculation Machine

Wheelchair Ramp Length Calculator

Ramp length from rise using ADA slope ratios.

Reviewed by James Whitfield · How we check our maths

Your values

ⓘ Live results

Results
Minimum ramp length
24 ft
Slope angle
4.76°
Intermediate landings needed (every 30 ft max)
0

Quick answer

ADA guidance requires at least 12 inches of ramp length for every 1 inch of rise, giving a maximum slope of about 4.8 degrees.

The formula

length = rise x slope ratio

Worked example

Worked example

Using the values the calculator loads with.

Inputs

  • Total rise24 in
  • Slope ratio1:12 (ADA standard)

Result

  • Minimum ramp length24 ft
  • Slope angle4.76°
  • Intermediate landings needed (every 30 ft max)0

How to use the Wheelchair Ramp Length Calculator

  1. 1Measure the total rise the ramp needs to overcome.
  2. 2Use a 1:12 slope ratio for ADA-compliant ramps, or gentler ratios for more comfort.
  3. 3Add a level landing at least every 30 feet of ramp run, and at top and bottom.

Frequently asked questions

What is the max rise between landings?

ADA limits a single ramp run to 30 inches of rise before requiring a landing.

Can a home ramp be steeper than 1:12?

Some residential exceptions allow steeper slopes for very limited rise, but 1:12 remains the safest standard.

About this calculator