Arctan Calculator
When you need to check arctan, the Arctan gives you a useful starting point. Try a known example if you want to verify the answer.
Angle
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Degrees—
Radians—
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How to use the Arctan
Enter the requested values and start with one realistic example. Read the result together with its unit or label, then change one input at a time if you want to compare options.
Review the assumptions on the page and confirm any result that affects money, safety, technical work or another important decision.
Frequently Asked Questions
What does it return?
The angle whose arctan matches your value, shown in both degrees and radians.
What values are allowed?
Any real number is allowed.
Can I use the result as an exact answer?
Treat it as an estimate or check unless the page and the rules that apply to you confirm otherwise. Rounding, fees and personal details can change the final result.