Inverse Cosine Calculator

Calculate the inverse cosine of a number

The calculator will find the inverse cosine of the given value in radians and degrees.

The inverse cosine $$$y=\cos^{-1}(x)$$$ or $$$y=\operatorname{acos}(x)$$$ or $$$y=\operatorname{arccos}(x)$$$ is such a function that $$$\cos(y)=x$$$.

The domain of the inverse cosine is $$$[-1,1]$$$, the range is $$$[0,\pi]$$$.

It is an even function.

Related calculator: Cosine Calculator

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Your Input

Find $$$\operatorname{acos}{\left(\frac{1}{2} \right)}$$$.


$$$\operatorname{acos}{\left(\frac{1}{2} \right)} = \frac{\pi}{3}\approx 1.047197551196598$$$A

$$$\operatorname{acos}{\left(\frac{1}{2} \right)} = 60^{\circ}$$$A

For graph, see the graphing calculator.