Inverse Trig Calculator

Find the angle whose sine, cosine or tangent is a given value.

What Do You Want to Find?
Fractions and decimals both work.
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Angle
In radians
All angles from 0° to 360°
Principal range
Work

Saved Calculations

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Inverse Trig Functions

arcsin: −90° to 90°   arccos: 0° to 180°   arctan: −90° to 90°   atan2(y, x): −180° to 180°

Because trig functions repeat, each inverse returns one "principal" angle; the page also lists every solution between 0° and 360°.

Worked Example

Tips

atan2 uses the signs of both x and y to put the angle in the correct quadrant, which is what you want for directions and bearings.