Frequently Asked Questions
Everything you need to know about the Degrees to Radians Converter.
How do I convert degrees to radians?
Multiply degrees by π/180. Enter your value in degrees and the calculator shows the radian equivalent instantly, both as a decimal and an exact π fraction.
What is a gradian?
A unit where a full circle is 400 gradians instead of 360 degrees or 2π radians. It's occasionally used in surveying.
What does the π fraction form show?
The exact radian value as a reduced fraction of π, e.g. 90° = π/2, rather than the rounded decimal 1.5708.
Can I enter a negative angle?
Yes, negative angles are converted correctly and shown on the unit circle diagram in the clockwise direction.
Can I enter an angle greater than 360°?
Yes, the conversion works for any value; the unit circle diagram shows the equivalent position after wrapping around.
How do I convert radians to degrees?
Multiply radians by 180/π. Switch the unit selector to Radians and enter your value.
Why use radians instead of degrees?
Radians relate arc length directly to radius (arc = radius × angle in radians), which simplifies calculus and many physics formulas.
Does the unit circle diagram update live?
Yes, it redraws immediately as you type.
Is my data stored?
No; all conversion happens locally in your browser.
Is it free?
Completely free, no sign-up or limits.