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The Math.tan() function returns the tangent of a number.




A number representing an angle in radians.


The tan method returns a numeric value that represents the tangent of the angle.

Because tan is a static method of Math, you always use it as Math.tan(), rather than as a method of a Math object you created.


Example: Using Math.tan

The following function returns the tangent of the variable x:

function getTan(x) {
   return Math.tan(x);

Because the Math.tan() function accepts radians, but it is often easier to work with degrees, the following function accepts a value in degrees, converts it to radians and returns the tangent.

function getTanDeg(deg) {
   var rad = deg * Math.PI/180;
   return Math.tan(rad);


Specification Status Comment
ECMAScript 1st Edition. Implemented in JavaScript 1.0 Standard Initial definition.
ECMAScript Language Specification 5.1th Edition (ECMA-262) Standard  
ECMAScript Language Specification 6th Edition (ECMA-262) Draft  

Browser compatibility

Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari
Basic support (Yes) (Yes) (Yes) (Yes) (Yes)
Feature Android Chrome for Android Firefox Mobile (Gecko) IE Mobile Opera Mobile Safari Mobile
Basic support (Yes) (Yes) (Yes) (Yes) (Yes) (Yes)


Document Tags and Contributors

 Last updated by: Sheppy,