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Cos Inverse Calculator
Find the angle whose cosine is a given value (arccos).
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arccos(x)
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Find the angle whose cosine is a given value (arccos).
Cos Inverse Estimator
Enter your numbers below for an instant estimate.
0
💡 Tip: theta = arccos(x).
How It Works
Key concepts behind this calculator
1
Enter Values
Fill in each field with your own numbers.
2
Calculate
Results update as you change the inputs.
3
Review
Read the breakdown and the explanation.
4
Adjust
Change values to compare scenarios.
Quick Reference Guide
Cos Quick Guide
Typical values for reference.
| cos value | Degrees | Radians | In pi |
|---|---|---|---|
| 1 | 0.00 deg | 0.0000 rad | 0.000 pi |
| 0.5 | 60.00 deg | 1.0472 rad | 0.333 pi |
| 0 | 90.00 deg | 1.5708 rad | 0.500 pi |
| -1 | 180.00 deg | 3.1416 rad | 1.000 pi |
| Rule of Thumb | Check inputs | Use as a guide | Round sensibly |
Common Questions
Cos Inverse Calculator FAQ
Answers to common questions about this calculator.
The angle whose cosine is x.
-1 to 1.
Yes, 360 minus the principal angle also works.
60 degrees.