Arctan Calculator
Find inverse tangent angle in degrees and radians
Calculate Clear
Arctan Formula
θ = arctan(x), where tan(θ) = x
Arctan reverses the tangent function on its principal range. It turns a slope or opposite-over-adjacent ratio into an angle.
⚠ Arctan accepts any real input. The result is the principal angle between -90° and 90°.
How Arctan Works
If tan θ equals x, arctan(x) returns the angle θ. This is especially useful when a slope or side ratio is known.
Inverse Tangent
Arctan reverses tangent.
Input Range
Any real number is allowed.
Output Range
Principal angle is -90° to 90°.
Slope Link
Arctan converts slope to angle.
💡 Example: arctan(1)=45°=0.785398 rad.
Applications of Arctan
Slopes Surveying Navigation Physics
Frequently Asked Questions
What is an arctan calculator?▼
It finds the angle whose tangent equals the input value.
What input values can arctan use?▼
Arctan accepts any real number.
How do I use this calculator?▼
Enter a tangent value and click Calculate.
What is the output range of arctan?▼
The principal output is from -90° to 90°, not including the endpoints.
Where is arctan used?▼
Arctan is used to find angles from slopes, ratios, navigation, surveying, and physics.
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