Angle converter
Convert between degrees, radians, gradians, turns, arcmin and arcsec.
Angle converter
Convert angles between degrees (deg), radians (rad), gradians (grad), turns, arcminutes (arcmin) and arcseconds (arcsec). Useful for geometry, trigonometry, navigation and CAD. It all runs in your browser.
Useful equivalents
360° = 2π rad = 400 grad = 1 turn. So 180° = π rad and 90° = π/2 rad. 1 rad ≈ 57.2958°. 1° = 60 arcmin = 3,600 arcsec.
Degrees vs radians
Most everyday measurements use degrees; mathematics and programming languages’ trig functions (sin, cos, tan) almost always expect radians. Convert before you compute.
Frequently asked questions
How many radians is 180 degrees? π radians (about 3.1416 rad).
What is a gradian? A unit where a right angle is 100 grad (so a full circle is 400 grad), used in surveying.