Ramp Calculator

Your details

Pick a slope and get the length, or enter the run you have and see the slope it produces and whether it meets the ADA.
Total vertical height the ramp must climb, for example the height of a porch, step or truck bed above the ground.
in
A 1:12 ratio means 12 units of horizontal run for every 1 unit of vertical rise. 1:12 is the steepest the ADA allows for new unassisted construction.
Currency
Horizontal runWithin ADA maximum (1:12)
24 ft
Total ramp length24.08 ft
Slope ratio1:12
Slope8.33%
Angle4.76°
Ramp sections (ADA run cap)1
Level landings needed0
HandrailsRequired (both sides)
8.33 %
1:20 gentle<51:165-6.251:12 ADA max6.25-8.34Assisted only8.34+

A 1:12 ramp: about 24 ft of run, 24.08 ft along the slope.

  • A 1:12 ramp needs about 24 ft of run and 24.08 ft of ramp surface along the slope.
  • The rise is under the 30 in single-run limit, so one straight ramp run is fine.
  • Handrails are required on both sides for this rise; add edge protection so wheels cannot slip off.

Next stepAdd a level landing at the top and bottom (at least 60 in long) and handrails on both sides for any ramp steeper than 1:20.

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