# Calculate the midpoint of a given range

Average the two ends of a [from, to] range.

Canonical: https://1loc.dev/math/calculate-the-midpoint-of-a-given-range/
Version: 1.0.0
Runtime: JavaScript · Node.js 22 / modern browsers
Verification: Local fixtures; no external services
Updated: 2026-10-28

## Implementation

```javascript
function rangeMidpoint([from, to]) { return (from + to) / 2; }
```

## Input

```json
[
  10,
  20
]
```

## Expected output

```json
15
```

## Edge case

Input:
```json
[
  -5,
  5
]
```
Output:
```json
0
```

## Limits

- The order of the ends does not matter.

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/calculate-the-midpoint-of-a-given-range.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.