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Angle converter
Angle converter: convert between degrees and radians online, free and without signing up. Pick the From and To units, type a value and read the result as you type. Nothing is uploaded: the maths runs in your browser.
How to convert angle units online
- 1Type the number you want to convert
- 2Pick the From and To units
- 3Read the result, or look it up in the table
- The value in your unit, 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 between degrees and radians, including negative angles and angles over 360 degrees. The result changes as you type.
- Example: 180 degrees = 3.14159 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
- The page opens with degrees as the From unit, radians as the To unit and a value of 1. Change either unit at any time.
- 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.