Math.round()
Returns the value of a number rounded to the nearest integer.
Syntax
Math.round(x)Parameters
| Name | Type | Required | Description |
|---|---|---|---|
x | number | Yes | The number to round. |
Returns
number — The value of x rounded to the nearest integer.
Examples
console.log(Math.round(2.5), Math.round(2.4));
Output
3 2
console.log(Math.round(-2.5));
Output
-2
Notes
Ties round toward positive infinity (half-up), so `Math.round(-2.5)` is -2,
not -3. This asymmetry can surprise; for banker's rounding implement it
manually.
Browser & runtime support
| Environment | Since version |
|---|---|
| chrome | 1.0 |
| firefox | 1.0 |
| safari | 1.0 |
| edge | 12 |
| node | 0.10 |