Slope calculator
Calculate the slope of a ramp, roof, drain pipe or terrain and convert it between units.
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How it is calculated
slope (%) = rise / run × 100
angle = arctan(slope / 100)
A 100 % slope equals 45°. A 2 % drain slope means 2 cm of fall per metre, about ¼ in per foot.
Frequently asked questions
How many degrees is a 10 % slope?
5.71°.
What is the maximum ADA ramp slope?
1:12, which is 8.33 % or 4.76°.