Developer tools
Angle converter
Type an angle in any unit and the rest update instantly, linked by the fixed chain 1 turn = 360 degrees = 2 pi radians = 400 gradians. Everything runs in your browser - nothing is uploaded.
90°
Common angles (degrees to radians)
| Degrees | Radians |
|---|---|
| 30 | 0.5236 |
| 45 | 0.7854 |
| 60 | 1.0472 |
| 90 | 1.5708 |
| 120 | 2.0944 |
| 180 | 3.1416 |
| 270 | 4.7124 |
| 360 | 6.2832 |
How it works
Type an angle in any unit - degrees, radians, gradians, or turns - and the rest update instantly. Degrees split a full circle into 360, radians measure it as 2 pi (about 6.283), gradians divide it into 400, and one turn is a single full revolution. They all describe the same rotation, just on different scales.
Radians are the natural unit for trigonometry and most programming math functions, degrees are the everyday choice, and CSS accepts all four for gradients and transforms. This converter uses the exact relationships 1 turn = 360deg = 2 pi rad = 400grad, so the numbers line up precisely. Everything runs in your browser, with nothing uploaded.
Example. A right angle is 90 degrees, which is about 1.5708 radians, 100 gradians, or 0.25 of a turn. A half turn is 180 degrees or pi radians.
FAQ
How do I convert degrees to radians?
Multiply degrees by pi divided by 180. So 90 degrees is 90 times pi/180, which is pi/2 or about 1.5708 radians. To go back, multiply radians by 180/pi.
What is a gradian?
A gradian, also called a gon, divides a full circle into 400 units, so a right angle is exactly 100 gradians. It is used in some surveying and engineering contexts because right angles come out as round numbers.
Does CSS support all these units?
Yes. CSS angles accept deg, rad, grad, and turn for things like gradients and transforms. For example 0.25turn, 90deg, and 100grad all describe the same quarter rotation, so you can use whichever reads best.
Is anything uploaded?
No. The conversion is simple math that runs entirely in your browser. Nothing you type is sent to a server, logged, or stored.