Angle Converter
Convert angles between degrees, radians and gradians. Useful for math, engineering and graphics.
Grade % = tan(angle) × 100, defined here only for −90° < θ < 90°.
Common angles reference
Land area? Area converter · trig: Scientific calculator · general units: Unit converter.
Convert angles
Type degrees, arcminutes, arcseconds, DMS, radians, gradians, turns or a principal-domain slope grade. Angles outside −90° to 90° still convert normally, but slope displays N/A rather than wrapping through tangent’s period.
FAQ
How many radians is 180 degrees?
180 degrees equals π radians (about 3.14159).
What is a gradian?
A gradian (gon) divides a right angle into 100 parts, so a full circle is 400 gradians.
What is slope grade in percent?
Grade (slope %) is rise ÷ run × 100. It is single-valued only in the principal slope domain −90° < θ < 90°; other angles show N/A.
Can I enter degrees, minutes and seconds?
Yes. Enter DMS such as 12° 34′ 56″ (or -12 34 56), or use the arcminute and arcsecond fields directly.
Does it convert both ways?
Yes — type a value in any field and the others update instantly.
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