Cos Calculator
Calculate the cosine of an angle in degrees or radians. This page also shows the angle converted to radians and indicates common known-angle cases.
Computes:
cos(θ)
| Metric | Value |
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Privacy: calculations run locally in your browser. No inputs are stored or transmitted.
How it works
This calculator converts the angle to radians internally when necessary, then evaluates the cosine function.
Common values:
cos(0°) = 1,
cos(60°) = 0.5,
cos(45°) ≈ 0.7071,
cos(90°) = 0
Examples
- 60° → cos = 0.5
- 45° → cos ≈ 0.7071
- π rad → cos = -1
FAQ
- What does this cos calculator compute?
It computes the cosine of an angle in either degrees or radians.
- Can I switch between degrees and radians?
Yes. The calculator supports both degree mode and radian mode.
- What is cosine?
In right-triangle trigonometry, cosine is adjacent divided by hypotenuse. More generally, it is the x-coordinate on the unit circle.
- Why do some results look like 0 when they should be tiny?
Very small floating-point values are rounded to 0 for readability.
- Are calculations stored?
No. Everything runs locally in your browser.