A full circle is 360 degrees, 2π radians, 400 gradians or one turn. Radians are the natural unit in calculus and programming, since functions like Math.sin in JavaScript expect radians, while degrees are used on protractors, maps and CAD tools. One radian is about 57.2958 degrees and one degree is about 0.0174533 radians. This converter also handles arcminutes and arcseconds (1° = 60′ = 3,600″), used in astronomy and GPS coordinates, and gradians, found on surveying instruments and many scientific calculators.
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