On this page is a *half angle formula calculator*, which calculates the trigonometric functions for half a given input angle for sine, cosine, tangent, cotangent, secant, and cosecant.

## Half Angle Trig Calculator

**Table of Contents**show ▼

## Using the Half Angle Trigonometry Calculator

To use the tool to find the results of the trigonometric functions for half a given angle, enter the angle, choose how its measured (degrees or radians) and compute.

**Angle:**Enter the angle which you'd like to compute the functions using – the tool will take half**Degrees or Radians:**Choose which units you use to measure the angle

Where results are undefined, you'll see "NaN".

*Next, see the double angle calculator, or the triple angle calculator, or trigonometry functions calculator, or inverse trigonometry calculator.*