Ramp Calculator

How long does a ramp need to be?

in
Slope
ft

Plan on

18 ft 0 3/4 inof ramp

For carts, loading and sheds. For a wheelchair route, use the wheelchair ramp calculator, which adds landings.

1 in 12, 4.8 degrees18 in rise, 4 ft wide18 ft 0 3/4 in ramp
Level run18 ft 0 in
Angle4.8 degrees
Decking area72.2 sq ft
Grade8.3%

Find the length for a loading, shed or mower ramp at the slope you choose.

How it works

Rise × the slope number gives level run. The ramp surface is the hypotenuse of rise and run.

Before you order

  • Gentler slopes are far safer for heavy carts and mowers.
  • Use a grip surface where boots or wheels will be wet.
  • Check your load and the deck capacity before crossing a ramp with a machine.

Common questions

What slope is good for a shed ramp?

About 1 in 8 is workable for hand carts, and gentler is easier with a mower.

How do I convert slope to degrees?

Take the arctangent of rise over run. A 1 in 12 slope is about 4.8 degrees.