How to use the angle converter
This angle converter lets you switch between degrees, radians, and gradians in one place. Choose the unit you are converting from and the unit you want to convert to, enter a value, and click "Convert" to see the result. A "Swap" button reverses the from and to units so you can check conversions in both directions without retyping. All conversions use degrees as an intermediate step: input is converted to degrees, then to the target unit, so the tool stays consistent and accurate.
Angle conversion is useful in many situations. In mathematics and physics, radians are the standard because they simplify calculus and trigonometry (for example, the derivative of sin x is cos x only when x is in radians). In everyday life and navigation, degrees are more intuitive—a full turn is 360°. Gradians divide a circle into 400 parts and appear in some surveying and engineering work. Whether you are solving a calculus problem, programming with trig functions (which usually expect radians), or reading a protractor in degrees, having a single tool that handles degrees, radians, and gradians saves time and reduces errors.
The converter runs entirely in your browser. There is no sign-up, no download, and no delay. It is designed to be mobile-friendly: the two-column layout stacks on small screens, inputs have a comfortable touch size, and the result appears next to your input so you can compare at a glance. Results are shown with up to six decimal places when needed. Key relationships: 180° = π radians, 90° = π/2 radians, and 400 gradians = 360°.
Bookmark this page for quick access whenever you need to convert angles between degrees, radians, and gradians. Whether you are a student, engineer, or developer, this free angle converter provides fast, accurate, and easy-to-read results on any device.