The Math.log10()
function returns the base 10 logarithm of a number, that is
Syntax
Math.log10(x)
Parameters
x
- A number.
Return value
The base 10 logarithm of the given number. If the number is negative, NaN
is returned.
Description
If the value of x
is less than 0, the return value is always NaN
.
Because log10()
is a static method of Math
, you always use it as Math.log10()
, rather than as a method of a Math
object you created (Math
is not a constructor).
This function is the equivalent of Math.log(x) / Math.log(10). For log10(e) use the constant Math.LOG10E
which is 1 / Math.LN10
.
Examples
Using Math.log10()
Math.log10(2); // 0.3010299956639812 Math.log10(1); // 0 Math.log10(0); // -Infinity Math.log10(-2); // NaN Math.log10(100000); // 5
Polyfill
This can be emulated with the following function:
Math.log10 = Math.log10 || function(x) { return Math.log(x) * Math.LOG10E; };
Specifications
Specification | Status | Comment |
---|---|---|
ECMAScript 2015 (6th Edition, ECMA-262) The definition of 'Math.log10' in that specification. |
Standard | Initial definition. |
ECMAScript Latest Draft (ECMA-262) The definition of 'Math.log10' in that specification. |
Draft |
Browser compatibility
The compatibility table in this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.
Feature | Chrome | Firefox | Edge | Internet Explorer | Opera | Safari |
---|---|---|---|---|---|---|
Basic Support | 38 | 25 | (Yes) | (No) | 25 | 7.1 |
Feature | Android | Chrome for Android | Edge mobile | Firefox for Android | IE mobile | Opera Android | iOS Safari |
---|---|---|---|---|---|---|---|
Basic Support | (Yes) | (Yes) | (Yes) | 25 | (No) | (Yes) | 8 |