About this tool
Angle Converter is a free, in-browser tool that expresses a single angle in four units at once — degrees, radians, gradians (also called gons), and turns. Enter a value, choose the unit it is currently in, and every equivalent is shown side by side.
Internally it converts your input to a common base of degrees — one radian is 180/π degrees, one gradian is 0.9 degrees, and one turn is 360 degrees — then derives the other units from that base. Results refresh as you type and are rounded to nine decimal places; click any result to copy it to the clipboard. The value field accepts any real number, so negative and decimal angles work too.
Everything runs entirely in your browser: no uploads, no accounts, no tracking, and it keeps working offline once the page has loaded. A typical use is checking that an angle in radians from code matches the degrees you expect, or reading a gradian survey figure back in familiar units.