Cosine Calculator
Calculate the cosine of an angle
About this calculator
A cosine calculator determines the cosine value of any angle, which represents the ratio of the adjacent side to the hypotenuse in a right triangle. This trigonometric function is essential in mathematics, physics, engineering, and computer graphics for solving problems involving periodic phenomena, wave functions, and geometric calculations. The calculator provides accurate results for angles measured in degrees or radians, making it invaluable for students, professionals, and anyone working with trigonometric equations or analyzing oscillatory motion.
How to use
Enter the angle value in the input field and select whether it's measured in degrees or radians using the unit selector. Click the calculate button to instantly get the cosine value. The result will display as a decimal number between -1 and 1, representing the cosine of your specified angle.
Frequently asked questions
What is the range of cosine values?
Cosine values always range from -1 to 1, regardless of the input angle. This represents the horizontal coordinate on the unit circle.
Can I use degrees or radians?
Yes, most cosine calculators accept both degrees and radians. Simply select your preferred unit before calculating the cosine value.
What angles have cosine equal to zero?
Cosine equals zero at 90°, 270° (or π/2, 3π/2 radians) and their equivalent angles like 450°, -90°, etc.