Math

`Math.log10`

Returns the base 10 logarithm of a number

Syntax

JavaScript

Math.log10(x)

Parameters

Parameter	Type	Description
x	number	A positive number

Return Value

The base 10 logarithm of x

Examples

Basic Usage

console.log(Math.log10(100)); // 2
console.log(Math.log10(1000)); // 3

Practical Example

function digitCount(n: number) {
  return Math.floor(Math.log10(Math.abs(n))) + 1;
}
console.log(digitCount(12345)); // 5

Advanced Usage

console.log(Math.log10(1)); // 0
console.log(Math.log10(10)); // 1

Understanding Math.log10

The Math.log10 method in JavaScript returns the base 10 logarithm of a number. It belongs to the Math object and is one of the most widely used methods for working with math values in modern JavaScript and TypeScript applications.

The method signature is Math.log10(x). It accepts 1 parameter: x. When called, it returns the base 10 logarithm of x. Understanding when and how to use log10() helps you write more expressive, readable code.

Common use cases for Math.log10 include data transformation, input validation, API response processing, and building reusable utility functions. It works well alongside related methods like math-log, math-log2, enabling you to chain operations together for complex data manipulation pipelines.

Browser support for Math.log10 is excellent across all modern browsers including Chrome, Firefox, Safari, and Edge. It is also fully supported in Node.js and Deno. For older environments, transpilation with Babel or a polyfill may be needed.