Math.log10()

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.

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

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

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Syntax

js
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 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 Math.LOG10E, which is 1 / Math.LN10.

Examples

Using Math.log10()

js
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

Specification
ECMAScript Language Specification
# sec-math.log10

Browser compatibility

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See also