Arccos Calculator

How to Calculate Arccos

The arccosine function, written as arccos(x) or cos^-1(x), allows us to determine the angle when we know its cosine value. The value of x must be between -1 and 1 since cosine values do not exceed these limits.

• Arccos(x): Calculates the angle whose cosine is x.


• For example, if cos(θ) = 0.5, then arccos(0.5) = 60° (or π/3 radians).

Understanding Your Results

The result of an arccos calculation is an angle, typically given in degrees or radians. This angle represents the position where the cosine of the angle equals the value of x you entered. You can use the dropdown menu to easily convert your result into different units of angle measurement, such as degrees, radians, gradians, or turns, depending on your needs.

How to Use the Arccos Tool

This arccos calculator is very simple to use. Just follow these steps:

1. Enter the value of x, which must be between -1 and 1.


2. Hit the calculate button to get the corresponding angle value.


3. Use the dropdown menu to convert the result to your preferred unit (e.g., degrees, radians, etc.).

Example Calculation

Let’s say you want to find the angle whose cosine value is 0.5. You enter 0.5 into the input field, hit calculate, and the tool will return 60° as the answer (or π/3 radians). You can then change the units using the dropdown menu if desired.