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Compute the cosine of any angle in degrees or radians. Cosine gives the adjacent/hypotenuse ratio and the x-coordinate on the unit circle.
cos(θ) = adjacent / hypotenuse — enter degrees or radians, undefined cases flagged.
cos(θ) = adjacent / hypotenuse
On the unit circle, cos(θ) is the x-coordinate of the angle's point.
| Symbol | Meaning |
|---|---|
| θ | Angle (degrees or radians) |
cos(60°) = 0.5, cos(0°) = 1, cos(180°) = −1.
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Content updated: September 2026