Angle Converter
Fast, accurate angle conversions, right in your browser.
The Angle Converter converts between degrees, radians, gradians, and other angular units used in geometry, trigonometry, engineering, and navigation. Radians are the standard unit in most programming languages' math functions (like JavaScript's Math.sin()), while degrees are more familiar for everyday and CAD work — this tool handles the conversion factor (180° = π radians) instantly.
How to Convert Angles
- Enter your angle value and select the starting unit
- Choose the unit you want to convert to
- The converted result appears instantly
Common Uses
- Converting between radians and degrees for trigonometric calculations in code
- CAD and engineering drawings that mix unit conventions
- Navigation and surveying calculations using gradians
Frequently Asked Questions
What angle units does this converter support?
Common units include degrees, radians, gradians, and sometimes minutes/seconds of arc.
How do I convert degrees to radians?
Multiply the degree value by π/180 (approximately 0.01745) to get radians.
Why do math and physics often use radians instead of degrees?
Radians are the natural unit for angle in calculus and trigonometry, since they directly relate arc length to radius, simplifying many mathematical formulas compared to degrees.
What is a gradian?
A gradian (or gon) divides a full circle into 400 units instead of 360 degrees or 2π radians — used in some surveying and engineering contexts, especially in parts of Europe.
Is this tool free to use?
Yes, completely free with no signup, no limits and no software to install.
Is my data saved anywhere?
No — conversions run in your browser and the values you enter are not stored or sent to a server.
How many radians are in a full circle?
A full circle equals 2π radians (approximately 6.283 radians), equivalent to 360 degrees.
Is this useful for programming or game development?
Yes — many programming languages' math functions (like sin/cos) expect radians, while user-facing angle values are often in degrees, making this a common conversion need for developers.
What is 90 degrees in radians?
90 degrees equals π/2 radians, approximately 1.5708 radians.
Is this useful for navigation or surveying?
Yes — bearings and angles in navigation and land surveying are sometimes expressed in different unit systems, and this tool helps translate between them.
