THE IDEA BEHIND THE ANSWER
A formula you can follow.
angle = asin(ratio), acos(ratio) or atan(ratio)
Both output units are shown. asin uses −90°…90°, acos uses 0°…180°, and atan uses the open interval (−90°, 90°).
SCIENTIFIC MATH / ONE CLEAR STEP AT A TIME
Inverse trigonometry
Find the principal angle for a sine, cosine or tangent ratio.
01 / YOUR NUMBERS↘
Make it your own.
Start with the example below, or enter your values.
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02 / A LITTLE CLARITYREADY WHEN YOU ARE
Your answer belongs here.
Enter your numbers and we’ll work through the calculation together.
YOUR RESULT
How we got there
GOOD TO KNOW
A few helpful details
How do I use this calculator?
Enter inverse function, input ratio, preferred output unit. Choose any available mode, then select Calculate. The example numbers are a starting point you can change.
What if my input cannot be calculated?
A message explains what to change. Previous results are cleared when you edit an input, so the answer always matches the values you calculated.
Are my values sent anywhere?
No. These tools calculate locally in your browser, without an account. Displayed numeric results are rounded; these tools do not provide arbitrary-precision arithmetic.