Cosine Calculator

Summary

Enter an angle in degrees or radians and instantly get its cosine value with a unit-circle visualization.

How it works

1. Enter an angle value in the input field.
2. Select whether the angle is in degrees or radians.
3. The cosine value is calculated instantly using the built-in Math.cos() function.
4. The unit-circle diagram updates to show the angle and the corresponding x-coordinate (cos value).
5. Copy the result or continue entering different angles.

Use cases

• Verify trig homework answers without a physical calculator.
• Quickly look up cosine values for common angles (0°, 30°, 45°, 60°, 90°).
• Convert between degree and radian representations of an angle.
• Check cosine values needed for physics or engineering formulas.
• Visualize where an angle falls on the unit circle.
• Compute cosine for large or negative angles with automatic normalization.

Frequently Asked Questions