Elevation Grade Calculator
Calculate slope grade percentage, ratio, and angle from rise and run. Essential for drainage, roads, ADA ramps, and landscaping.
โฐ๏ธ Elevation Grade Calculator
Results
Grade6.00%
Slope Ratio1 : 16.7
Angle3.43ยฐ
Slope Length100.2 ft
๐ก 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 รท run) ร 100. Positive grade = uphill; negative grade = downhill.
Common grade requirements: lawn drainage (1โ2%), driveway maximum (15โ25%), wheelchair ramp (ADA maximum 8.33%, or 1:12), French drain (1%), sanitary sewer (1โ2%), parking lot (1โ5%). 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 = 3.43ยฐ. Slope length = 100.2 ft โ slightly longer than the horizontal run.