An online calculator to calculate the inverse cosine function arccos(x) in radians and degrees.

How to use the arccos (x) calculator

1 - Enter x as a real number, within the domain of arccos function given by [ -1 , 1 ] and the number of decimal places desired then press "enter". Two answers are displayed: one in radians and the second in degrees.

You may use it to explore the domain and range of arccos(x).