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Degrees to radians
Degrees to radians: type a value and read the result as you type, free and without signing up. The page also shows the value in every other angle unit. Nothing is uploaded: the maths runs in your browser.
How to convert angle units online
- 1Type the number you want to convert
- 2Check the units in From and To, or press Swap
- 3Read the result under the fields
- The converted value, plus every other unit.
What happens to your numbers
- Nothing is uploaded.The sum is done by your browser. The number you type never leaves your device.
- Exact: 180 degrees = π.180 degrees equal π radians, so 1 radian is about 57.29578 degrees.
- Works offline.Once the tool has been opened, it needs no connection.
What you can do
- Convert any angle, including negative angles and angles over 360 degrees. The result changes as you type.
- A worked example: 10 degrees = 0.174533 radians.
- Press Swap to turn the conversion around without retyping the number.
- Use it for trigonometry, programming and CAD, where sine and cosine functions expect radians.
Good to know
- A degree is 1/360 of a full turn. It is the everyday unit for angles, from compass bearings to slopes, and 1 degree is about 0.01745 radians.
- A radian is the angle at which the arc length equals the radius. A full turn is 2π radians, and 1 radian is about 57.2958 degrees.
- Results show up to 10 significant digits. Very large or very small values appear in exponent form, such as 1.500000e-7.
- A full turn is 360 degrees or 2π radians (about 6.28319). A right angle is 90 degrees or π/2 radians (about 1.5708).
Questions
Is this angle converter free?
Yes. It is free and needs no account or sign-up. Nothing you type is uploaded.
How exact is the result?
The factor is exact: 180 degrees equal π radians, so 1 degree is π/180, about 0.0174533 radians. The result shows up to 10 significant digits.
When do I need radians?
Radians are the standard angle unit in maths and physics and in most programming languages, where sin, cos and tan expect radians, not degrees.
Which units does it convert?
Degrees and radians, in both directions. Press Swap to change direction, or pick the units in the From and To fields.