Angle Converter — Degrees, Radians & Gradians

Convert between degrees, radians, gradians, arcminutes, arcseconds, milliradians, and turns.

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How this conversion works. Angles are converted through the degree; the radian factor uses 180/π per the SI definitions in the BIPM SI Brochure.

How to use

  1. Choose the units to convert from and to.
  2. Enter a value — the converted result updates instantly.
  3. Click Copy to copy the result to your clipboard.

Frequently asked questions

How do I convert degree to radian?

1 degree = 0.0174533 radian. Choose "Degree (°)" as From and "Radian (rad)" as To, type a value, and the result updates instantly.

Why do programming languages use radians?

Math library functions (sin, cos, tan) take radians because calculus identities like d/dx sin(x) = cos(x) only hold in radians. Multiply degrees by π/180 before calling them.

What is a gradian used for?

The gradian (gon) splits a right angle into 100 units, so 400 gon = 360°. Surveying instruments in parts of Europe still use it for decimal-friendly angle math.

Is my data sent to a server?

No. Conversions run entirely in your browser using fixed factors — nothing is uploaded or logged.

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