files/en-us/web/javascript/reference/global_objects/math/log10/index.md

metadata

title: Math.log10()
short-title: log10()
slug: Web/JavaScript/Reference/Global_Objects/Math/log10
page-type: javascript-static-method
browser-compat: javascript.builtins.Math.log10
sidebar: jsref

The Math.log10() static method returns the base 10 logarithm of a number. That is

$$\forall x>0,𝙼𝚊𝚝𝚑.𝚕𝚘𝚐𝟷𝟶(𝚡)={log}_{10}(x)=\text{the unique }y\text{ such that }{10}^y=x\backslash forall\; x\; >\; 0,\backslash ;\backslash mathtt\{\backslash operatorname\{Math.log10\}(x)\}\; =\; \backslash log\_\{10\}(x)\; =\; \backslash text\{the\; unique\; \}\; y\; \backslash text\{\; such\; that\; \}\; 10^y\; =\; x$$

{{InteractiveExample("JavaScript Demo: Math.log10()")}}

console.log(Math.log10(100000));
// Expected output: 5

console.log(Math.log10(2));
// Expected output: 0.3010299956639812

console.log(Math.log10(1));
// Expected output: 0

console.log(Math.log10(0));
// Expected output: -Infinity

Syntax

Math.log10(x)

Parameters

• x
  • : A number greater than or equal to 0.

Return value

The base 10 logarithm of x. If x < 0, returns {{jsxref("NaN")}}.

Description

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 {{jsxref("Math.LOG10E")}}, which is 1 / {{jsxref("Math.LN10")}}.

Examples

Using Math.log10()

Math.log10(-2); // NaN
Math.log10(-0); // -Infinity
Math.log10(0); // -Infinity
Math.log10(1); // 0
Math.log10(2); // 0.3010299956639812
Math.log10(100000); // 5
Math.log10(Infinity); // Infinity

Specifications

{{Specifications}}

Browser compatibility

{{Compat}}

See also

• Polyfill of Math.log10 in core-js
• es-shims polyfill of Math.log10
• {{jsxref("Math.exp()")}}
• {{jsxref("Math.log()")}}
• {{jsxref("Math.log1p()")}}
• {{jsxref("Math.log2()")}}
• {{jsxref("Math.pow()")}}