JavaScript (ES2026) reference · Math Methods and Constants

JavaScript Math.round() Method

Round a number to the nearest integer; halves round up towards +Infinity, so Math.round(-2.5) is -2.

JavaScript (ES2026) Since ES1

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Syntax

Math.round(x)

Parameter	Description
`x`	A number.

An integer.

Halves round upTry it yourself

console.log(Math.round(2.5), Math.round(2.4), Math.round(-2.5), Math.round(-2.6));

Output

3 2 -2 -3

Round to two decimalsTry it yourself

const price = 19.996;
console.log(Math.round(price * 100) / 100, price.toFixed(2));

Output

20 20.00

Version	Change
JavaScript ES1	Added

Math.floor() · Round a number down to the integer below it: Math.floor(4.9) is 4 and Math.floor(-4.1) is -5.
Math.ceil() · Round a number up to the next integer: Math.ceil(4.1) is 5 and Math.ceil(-4.1) is -4.
Math.trunc() · Remove the fractional part of a number, rounding towards zero: Math.trunc(-4.7) is -4.
number.toFixed() · Format a number with a fixed number of decimal places, returned as a string. Rounds, but floating-point quirks apply.
JavaScript Math · tutorial
JavaScript Numbers · tutorial