Ramp Slope Calculator — ADA Length & Angle

How the ramp slope calculator works

Ramp length (surface) = √(rise² + run²). ADA requires 1:12 maximum slope, with each ramp run limited to 30 ft (30 in of rise) before a landing.

Maximum 1:12 (8.33% or 4.76°). For 24 in of rise, that's a 24 ft ramp run plus landings.

3 steps ≈ 21 in rise → 21 ft of ramp run at ADA 1:12 slope, plus a 5 ft landing at top and bottom.

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