Arctan Calculator
Online arctan(x) calculator. Inverse tangent calculator.
Arctangent calculator
In order to calculate arctan(x) with the online calculator:
- Enter the input value.
- Select result type of degrees (º)
or radians (rad) in the right combo box.
- Press the = button
to calculate the result.
Arctangent definition
The arctangent function is the inverse function of y = tan(x).
arctan(y) = tan-1(y) = x
+ kπ
For every
k = {...,-2,-1,0,1,2,...}
For example, If the tangent of 45º is 1:
tan(45º) = 1
Then the arctangent of 1 is 45º:
arctan(1) = tan-1(1) = 45º
Arctangent table
| y |
x = arctan(y) |
| degrees |
radians |
| not defined |
-90º |
-π/2 |
| -1.732050808 |
-60º |
-π/3 |
| -1.000000000 |
-45º |
-π/4 |
| -0.577350269 |
-30º |
-π/6 |
| 0 |
0º |
0 |
| 0.577350269 |
30º |
π/6 |
| 1.000000000 |
45º |
π/4 |
| 1.732050808 |
60º |
π/3 |
| not defined |
90º |
π/2 |
Arctan on calculator
In order to calculate arctan(y) on a calculator:
- Press shift+tan buttons.
- Enter the angle.
- Press the = button.
Tangent calculator
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See also