Slope Angle Calculator
Find the slope and angle of an incline.
Result
How to use
- Enter your values in the fields above.
- Press Calculate to see your result instantly.
- Use the Share button to copy a link to your result.
About this calculator
This calculator converts rise and run (vertical change over horizontal distance) into both a slope percentage (rise/run × 100) and an angle in degrees (arctan(rise/run)) — two different ways of describing the same incline that aren't proportional to each other (a 100% slope is a 45° angle, not 100°).
Road and trail signage uses percentage grade (a "10% grade" warning sign), while construction and engineering drawings more often specify angle in degrees, so contractors building a wheelchair ramp (which must meet a maximum percentage grade under accessibility codes), hikers reading a trail's elevation profile, and roofers calculating a roof pitch all need to convert between the two.
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