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Degrees to Percent Slope Converter

Slope17.63%
Degrees
10°
Percent grade
17.633%
Rise : run
1 : 5.67
Rise per 100 ft
17.63 ft

Percent slope = tan(angle) × 100. A 45° slope is 100%, not 50%. ADA wheelchair ramps are limited to 1:12 (8.33%, 4.76°).

Convert a slope between degrees, percent grade and a rise : run ratio — useful for ramps, driveways, roads, roofs and hiking trails.

How to use the Degrees to Percent Slope Converter

  1. Choose what you know: degrees, percent or a ratio.
  2. Enter the value.
  3. Read the slope in the other forms.

How it works

Percent slope = tan(angle) × 100 = rise ÷ run × 100. A 45° slope rises 1 for every 1 across — 100%, not 50%. Small angles are almost proportional (1° ≈ 1.75%), but the percentage climbs steeply near 90°. The ADA limits wheelchair ramps to 1:12 (8.33%); interstate highways are usually kept under about 6%.

Degrees, percent and ratio

DegreesPercentRise : run
1°1.75%1 : 57.29
2°3.49%1 : 28.64
4.76°8.33%1 : 12.01
5°8.75%1 : 11.43
10°17.63%1 : 5.67
15°26.79%1 : 3.73
20°36.4%1 : 2.75
26.57°50.01%1 : 2
30°57.74%1 : 1.73
45°100%1 : 1

Frequently asked questions

Is a 45° slope 100%?

Yes — rise equals run.

What slope is a 1:12 ramp?

8.33%, or about 4.76°.

What grade is a steep road?

Roads above about 10% are considered steep; some streets exceed 30%.

How do I convert roof pitch?

A 6/12 roof pitch rises 6 in per 12 in: 50% or 26.57°.

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