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Slope Angle Calculator

Find the slope and angle of an incline.

How to use

  1. Enter your values in the fields above.
  2. Press Calculate to see your result instantly.
  3. 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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