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Degrees to Radians
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// about this tool

Degrees to Radians Online

Updated 2026-07-26

Convert degrees to radians online for free. Enter an angle in degrees and SnapTools shows the exact value in radians instantly, in your browser — nothing is uploaded.

Degrees are how people describe angles, but code doesn't — Math.sin(), cos(), and every trig function in JavaScript, Python, and nearly every other language take radians, and passing a raw degree value gives a silently wrong answer with no error thrown. This converter does the ×(π/180) math for you with full floating-point precision. For the full family of angle units — gradians, arcminutes, turns — use the Angle Converter.

// how to use

  1. 1 Type or paste an angle in degrees into the input.
  2. 2 SnapTools converts it to radians as you type.
  3. 3 Copy the result, or use the slider for a quick scrub across a full 360° turn.

// examples

A right angle
Input
90
Output
1.5708 rad
A half turn
Input
180
Output
3.14159 rad

// common uses

Converting a degree value before calling Math.sin()/cos() in code Preparing angles for trigonometry, physics, or engineering calculations Checking a CSS rotate() or canvas arc() value that expects radians Checking a manual angle conversion

// faq

Is my input uploaded to a server?
No. The conversion runs entirely in your browser, so nothing you enter leaves your machine.
Why do programming languages want radians, not degrees?
Functions like Math.sin(), cos(), and atan2() in JavaScript, Python, and most languages expect radians, not degrees — passing 90 (meaning 90°) instead of 1.5708 gives a wrong result silently.
What's the exact conversion factor?
Degrees to radians is degrees × (π / 180). This tool computes it with full floating-point precision, not a rounded π.
Why is 180° equal to π radians?
A radian is defined by arc length equal to the radius; a half-circle's arc is exactly π times the radius, so 180° — half a full turn — is exactly π radians.
What about converting radians back to degrees?
Use Radians to Degrees, or the full Angle Converter for gradians, arcminutes, and turns.

// works with your data

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Use this via API

Get a free API key → 
curl -X POST https://thesnaptools.com/api/v1/tools/degrees-to-radians \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"value":"90"}'
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