Inverse Tangent Calculator
Calculate the inverse tangent (arctan) of a given number in degrees or radians.
Published by:
isCalculator Editorial Team
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How to use this tool?
This calculator computes the inverse tangent (arctan) of a given number. The result is the angle whose tangent equals your input.
- Enter a value – Type any real number (e.g.,
1,-0.5,3.14) into the Value field. - Choose output unit – Select either Degrees or Radians from the dropdown.
- Click Calculate – The result appears below, showing the angle with 6 decimal places.
Example: For input 1 in degrees, the result is 45.000000° (since tan(45°) = 1).
Note: The calculator uses standard mathematical arctan, returning values between -90° and +90° (or -π/2 to π/2 radians). No special formatting is required – just enter any number.
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Frequently Asked Questions
Inverse tangent (arctan) is the angle whose tangent is a given number. It returns an angle in radians or degrees.
The output of arctan is between -90° and 90° (or -π/2 and π/2 radians) for real inputs.
Multiply radians by 180/π to get degrees. Our calculator does this automatically if you select 'Degrees'.
