Grade / Slope Converter
Percent, degrees, ratio, or rise/run, all at once.
Percent
5.00%
Degrees
2.86°
Ratio
1:20.0
Common reference grades
- Wheelchair ramp: max 8.33% (1:12)
- Highway max: 6%
- Steepest interstate (I-70): 7%
- Lombard Street: 27%
- Steepest road in the world (Baldwin Street, NZ): 35%
Slope, grade, and angle all describe the same thing in different units. Percent grade is rise/run × 100. Degrees use the arctangent. The 1:X ratio is the run for one unit of rise (the steeper the slope, the smaller X).
About
Enter slope in any of four forms (rise/run, percent, degrees, or 1:X ratio) and the others are computed. Includes a reference list of real-world grades so you know whether 8% is steep or normal.
How to use
- Pick an input mode.
- Enter the value.
- Read all four representations.
FAQ
How steep is a wheelchair ramp?+
ADA caps at 1:12, which is 8.33% or 4.76°. Most ramps you've used are at or below that.