Arccos Calculator
Find inverse cosine angle in degrees and radians
Calculate Clear
Arccos Formula
θ = arccos(x), where cos(θ) = x
Arccos reverses the cosine function on its principal range. It converts a cosine value into the angle whose cosine equals that value.
⚠ Input must be between -1 and 1. The calculator returns the principal angle from 0° to 180°.
How Arccos Works
If cos θ equals x, arccos(x) returns the principal angle θ. The result is useful when a ratio or dot product is known first.
Inverse Cosine
Arccos reverses cosine.
Input Range
x must be from -1 to 1.
Output Range
Principal angle is 0° to 180°.
Angle Units
Result is shown in degrees and radians.
💡 Example: arccos(0.5)=60°=1.047198 rad.
Applications of Arccos
Vectors Triangles Dot Products Physics
Frequently Asked Questions
What is an arccos calculator?▼
It finds the angle whose cosine equals the input value.
What is the arccos input range?▼
The input must be between -1 and 1 because cosine values stay in that range.
How do I use this calculator?▼
Enter a value from -1 to 1 and click Calculate.
What is the output range of arccos?▼
The principal output is from 0° to 180°, or 0 to π radians.
Where is arccos used?▼
Arccos is used in vectors, triangles, dot products, geometry, and physics.
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