Inverse Trig Calculator

Calculate arcsin, arccos, and arctan. Free online inverse trigonometry calculator.

The Inverse Trig Calculator finds angles from trigonometric values. Enter a sine, cosine, or tangent value to find the corresponding angle. These inverse functions (arcsin, arccos, arctan) are essential for solving triangles, finding angles from coordinates, and many engineering applications. Results in both degrees and radians.

Common use cases

  • Finding angles from side ratios
  • Navigation bearing calculations
  • Coordinate system conversions
  • Projectile angle analysis
  • Robotics arm positioning

How to use

  1. Select the inverse function (arcsin, arccos, arctan)
  2. Enter the trigonometric value
  3. Click calculate for the angle
  4. View result in degrees and radians
  5. Note the valid input ranges

FAQ

What are inverse trig functions?

They return the angle for a given ratio: arcsin finds angle from opposite/hypotenuse, etc.

What are the input ranges?

arcsin and arccos accept -1 to 1; arctan accepts any real number.

What are the output ranges?

arcsin: -90° to 90°, arccos: 0° to 180°, arctan: -90° to 90°.

How do I find all solutions?

Inverse functions give principal values. For all solutions, add multiples of the period based on the quadrant.