📐

Slope & Grade Calculator

Percent Slope · Angle · Ratio · ADA Compliance

When to use: Convert between rise/run, percent slope, slope angle, and ratio for walkways, ramps, and graded surfaces. % slope = rise / run × 100. The ADA check adapts to the selected mode: running slope of an accessible route must be ≤ 5% (1:20), with ramps permitted up to 8.33% (1:12) when handrails and landings are provided; cross slope must not exceed 2% (1:48).

Geometry

Rise (vertical)

Run (horizontal)

ADA Check Mode

Slope Type

Slope

5.00%

✓ Accessible route (no ramp needed)

Results

Percent Slope5.00 %

Slope Angle2.86 °

Ratio1 : 20

Rise1.00 ft

Run20.00 ft

Slope0.0500 ft/ft

References

ADA accessible route ≤ 5% (1:20)

ADA ramp max 8.33% (1:12) w/ handrails

ADA cross-slope max 2% (1:48)

% slope = rise/run × 100