Elevation Grade Calculator

Calculate slope grade percentage, ratio, and angle from rise and run. Essential for drainage, roads, ADA ramps, and landscaping.

⛰️ Elevation Grade Calculator

Results

Grade6.00%
Slope Ratio1 : 16.7
Angle3.43Β°
Slope Length100.2 ft

πŸ’‘ How to Calculate Elevation Grade

Grade (slope) is the ratio of vertical rise to horizontal run, expressed as a percentage. A 6% grade means 6 feet of rise over 100 feet of horizontal run. Grade = (rise Γ· run) Γ— 100. Positive grade = uphill; negative grade = downhill.

Common grade requirements: lawn drainage (1–2%), driveway maximum (15–25%), wheelchair ramp (ADA maximum 8.33%, or 1:12), French drain (1%), sanitary sewer (1–2%), parking lot (1–5%). Steeper grades increase erosion, stormwater runoff, and construction difficulty.

A 6 ft rise over 100 ft run: grade = 6%, slope ratio = 1:16.7, angle = 3.43Β°. Slope length = 100.2 ft β€” slightly longer than the horizontal run.

Elevation Grade Calculator FAQ

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