Degrees & Radians Converter
Switch between degrees and radians, both directions.
Angles both ways
Maths and programming use radians, while everyday angles come in degrees. Converting between them is essential for trigonometry and any code that uses angle functions.
Ninety degrees is π/2 radians, about 1.5708. This tool converts either direction and expresses radian results as a clean multiple of pi where possible.
Precise and private
The conversion runs in your browser, so nothing you enter is uploaded.
Frequently Asked Questions
What is a radian?
The angle where the arc length equals the radius. A full circle is 2π radians, or 360 degrees.
What is the conversion?
Multiply degrees by pi over 180 to get radians, or radians by 180 over pi to get degrees.
Why show multiples of pi?
Angles in radians are often cleaner as fractions of pi, like π/2 for a right angle.
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