Arctan Calculator
Enter a finite value and choose whether the result should use degrees or radians.
A QUICK WALKTHROUGH
How to use this tool
- Enter a finite value.
- Choose degrees or radians.
- Calculate and review the inverse tangent locally.
All finite inputs
Inverse tangent accepts any finite real number and returns a principal angle between −π/2 and π/2 radians.
Angle units
The calculation uses Math.atan in radians, then converts to degrees when selected.
Local calculation
The value stays in this browser and is not sent to a server.
GOOD TO KNOW
Common questions
What is arctan?
Arctan, or inverse tangent, returns the angle whose tangent equals the input value.
Which values are accepted?
Any finite real value is accepted; empty, non-numeric, Infinity, and NaN values are rejected.