Angle Converter

Convert an angle between degrees, radians, gradians, and revolutions. Enter the value and its unit.

Radians
— radians
Equivalent angle.

Usage Tip

To convert degrees to radians, multiply by pi and divide by 180; to go back, multiply by 180 and divide by pi.

THE MATH
A full turn = 360 degrees = 2π radians = 400 gradians = 1 revolution
Convert through degrees as the common base
Degrees and radians are the two most common angle units; radians are standard in higher math because they simplify formulas.
Gradians (400 per turn) appear in some surveying.
Pick the input unit; all four equivalents are shown.
Radians use pi, so common angles come out as fractions of pi.
One radian is about 57.3 degrees.
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