Cosine Calculator
Compute cos(x) for any angle.
Result
General calculation reads
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How to use this calculator
- Enter angle and unit.
- Read cosine plus matching sin/tan.
About this calculator
cos(x) is the x-coordinate of the unit-circle point at angle x. Range [−1, 1], period 2π. Key values: cos(0°) = 1, cos(60°) = ½, cos(90°) = 0, cos(180°) = −1.
Frequently asked
How does cos relate to sin?+
cos(90°) is exactly 0?+
Why is cos(180°) = −1?+
What is cos used for?+
How is cos different from arccos?+
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