Cosine Calculator
Calculate the cosine of an angle in degrees, radians or gradians. Precise result with up to 10 significant digits.
What is Cosine?
The cosine of an angle θ in a right triangle is the ratio of the adjacent side to the hypotenuse: cos(θ) = adjacent / hypotenuse. Cosine values always range between −1 and 1.
Notable values: cos(0°) = 1, cos(30°) ≈ 0.8660, cos(45°) ≈ 0.7071, cos(60°) = 0.5, cos(90°) = 0.
Unit conversions: 1° = π/180 rad ≈ 0.01745 rad. 1 rad = 180°/π ≈ 57.296°. 400 gradians = 360°.
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