Cos Calculator

The cosine function (cos) is the ratio of the adjacent side to the hypotenuse in a right triangle, or the x-coordinate on the unit circle. Cosine is the "horizontal component" of an angle, while sine is the vertical component

The calculator uses the standard published formula for cos calc. Results are accurate to the precision of the inputs you provide. For financial, medical, or legal decisions, always verify with a qualified professional.

This calculator works with inches. You can enter values in the units shown — the calculator handles all conversions internally.

The core formula is: In a right triangle: cos(θ) = adjacent / hypotenuse. Each step in the calculation is shown so you can verify the result manually.