Slope & Grade Calculator

Formula

slope% = (rise / run) × 100angle = atan(rise / run) × 180/πratio = run / rise (as X:1)slopeDistance = √(rise² + run²)

Parameters

Rise

Vertical change. Enter either rise or slope %.

Slope %

If set, calculates rise from run and percentage.

Results

Slope %

Grade as a percentage.

Angle

Slope angle in degrees.

Ratio

Run per 1 unit of rise (e.g., 12:1).

Slope Distance

Actual distance along the slope.

Rise

Calculated or input vertical change.

Example

slope = (1/12) × 100 = 8.3%angle = 4.8°ratio = 12:1 (ADA compliant)slopeDistance = √(1 + 144) = 12.0 ft

Common Use Cases

• ADA ramp compliance (max 1:12)
• Drainage grade checking
• Driveway slope estimation
• Road and parking lot grading

Notes

• ADA ramp max: 1:12 (8.33%). Sidewalk cross-slope max: 1:48 (2%).
• Residential drain minimum: 1-2% away from foundation.
• Driveway maximum: ~25%.