---
title: "Square miles to Acres — mi² to acre converter"
description: "1 square mile = 640 acres. Convert square miles to acres with a full conversion table, the exact formula, and a calculator for any value."
url: https://atoneplace.net/convert/square-miles-to-acres/
site: "At One Place"
---

# Square miles to acres

**1 square mile in acres: 1 mi² = 640 acre**

acre = mi² × 640

To convert square miles to acres, multiply by 640. The table below gives the values people look up most often, and the converter works for any number.

## Square miles to acres table

*Common square mile values converted to acres.*

| Square miles | Acres |
| --- | --- |
| 1 mi² | 640 |
| 2 mi² | 1,280 |
| 3 mi² | 1,920 |
| 4 mi² | 2,560 |
| 5 mi² | 3,200 |
| 10 mi² | 6,400 |
| 15 mi² | 9,600 |
| 20 mi² | 12,800 |
| 25 mi² | 16,000 |
| 30 mi² | 19,200 |
| 40 mi² | 25,600 |
| 50 mi² | 32,000 |
| 75 mi² | 48,000 |
| 100 mi² | 64,000 |
| 250 mi² | 160,000 |
| 500 mi² | 320,000 |
| 1,000 mi² | 640,000 |

## How the conversion works

The relationship is acre = mi² × 640. Both units measure area, so the conversion is a fixed factor that never changes.

## Common questions

### How many acres are in one square mile?

One square mile equals 640 acres. acre = mi² × 640.

### How do you convert square miles to acres?

Use acre = mi² × 640. So 10 mi² is 6,400 acre.

### How many square miles are in one acre?

One acre equals 0.0015625 square miles, which is the reverse of the conversion above.

## Related pages

- [Acres to Square miles](https://atoneplace.net/convert/acres-to-square-miles/)
- [Square miles to Square meters](https://atoneplace.net/convert/square-miles-to-square-meters/)
- [Square miles to Square kilometers](https://atoneplace.net/convert/square-miles-to-square-km/)
- [Square miles to Hectares](https://atoneplace.net/convert/square-miles-to-hectares/)
- [Square miles to Square feet](https://atoneplace.net/convert/square-miles-to-square-feet/)

## Sources

- Guide for the Use of the International System of Units (SP 811) — NIST (https://www.nist.gov/pml/special-publication-811) [Public domain (US Government)]
- The International System of Units (SI Brochure) — Bureau International des Poids et Mesures (https://www.bipm.org/en/publications/si-brochure)
- Calculated on this page — At One Place (/about/)