Arccos Calculator
Enter a value in the defined domain and choose whether the result should use degrees or radians.
A QUICK WALKTHROUGH
How to use this tool
- Enter a finite value from −1 to 1.
- Choose degrees or radians.
- Calculate and review the inverse cosine locally.
Defined domain
Inverse cosine accepts values from −1 through 1 inclusive. Values outside that range are rejected.
Angle units
The calculation uses Math.acos in radians, then converts to degrees when selected.
Local calculation
The value stays in this browser and is not sent to a server.
GOOD TO KNOW
Common questions
What is arccos?
Arccos, or inverse cosine, returns the angle whose cosine equals the input value.
Which values are accepted?
Only finite values from −1 to 1 are accepted.