Free Road Gradient Calculator
Calculate road gradient (slope) as a percentage and angle from the rise and run distance.
m
m
Gradient
5.00 %
Slope Ratio (1 in N)20.0
Slope Distance100.12 m
Gradient vs Vertical Rise
Road Gradient Calculation
Gradient expresses how steep a road is.
Formulas
Gradient (%) = (Rise / Run) x 100
Slope ratio = 1 in (Run / Rise) (e.g., 1 in 20)
Slope distance = sqrt(Rise^2 + Run^2)
Design guidelines typically limit residential roads to 8-12% and highways to 3-6% depending on terrain and design speed.
Example Calculation
A road rises 5 m over a horizontal distance of 100 m.
- 01Gradient = 5/100 x 100 = 5%
- 02Slope ratio = 1 in 100/5 = 1 in 20
- 03Slope distance = sqrt(25 + 10000) = sqrt(10025) = 100.12 m
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