Inverse Cosine Calculator

Trigonometric inverse cosine calculator

Between -1 and 1

What is inverse cosine

The inverse cosine is the multivalued function cos-1(x), also known as arccos(x), it's inverse function of the cosine.

Arccos table

x Deg. Degrees Rad. Radians
arccos(-1.0) 180.00 3.14
π
arccos(-0.9) 154.15 2.69
arccos(-0.8) 143.13 2.49
arccos(-0.7) 134.42 2.34
arccos(-0.6) 126.86 2.21
arccos(-0.5) 120.00 2.09
2π / 3
arccos(-0.4) 113.57 1.98
arccos(-0.3) 107.45 1.87
arccos(-0.2) 101.53 1.77
arccos(-0.1) 95.73 1.67
arccos(0.0) 90.00 1.57
π / 2
arccos(0.1) 84.26 1.47
arccos(0.2) 78.46 1.36
arccos(0.3) 72.54 1.26
arccos(0.4) 66.42 1.15
arccos(0.5) 60.00 1.04
π / 3
arccos(0.6) 53.13 0.92
arccos(0.7) 45.57 0.79
arccos(0.8) 36.86 0.64
arccos(0.9) 25.84 0.45
arccos(1.0) 0.00 0.00