# Round a number to the nearest multiple of a given value

Divide, round and multiply back.

Canonical: https://1loc.dev/math/round-a-number-to-the-nearest-multiple-of-a-given-value/
Version: 1.0.0
Runtime: JavaScript · Node.js 22 / modern browsers
Verification: Local fixtures; no external services
Updated: 2026-10-28

## Implementation

```javascript
function roundNearest({ value, nearest }) { return Math.round(value / nearest) * nearest; }
```

## Input

```json
{
  "value": 102,
  "nearest": 5
}
```

## Expected output

```json
100
```

## Edge case

Input:
```json
{
  "value": 1.25,
  "nearest": 0.1
}
```
Output:
```json
1.3
```

## Limits

- Math.round rounds .5 up, toward +∞. Fractional steps can produce floating-point noise.

The lab validates types and size before calling this function. Add equivalent validation at your own trust boundary.

## Source and license

Original: https://github.com/phuocng/1loc/blob/14b481cf60dff1620ab1bb99a43b1f68068cdd9b/contents/round-a-number-to-the-nearest-multiple-of-a-given-value.mdx
Author: Nguyen Huu Phuoc and original contributors
Contributors: See original repository history
Source commit: 14b481cf60dff1620ab1bb99a43b1f68068cdd9b
Copyright (c) 2020 phuoc-ng
License: MIT — https://1loc.dev/licenses/
Maintainer: Oveyon
Modifications: Curated implementation; explicit input contract, edge case and limits. Original MDX retained as inert source evidence.