---
title: "Acres to Square miles — acre to mi² converter"
description: "1 acre = 0.0015625 square miles. Convert acres to square miles with a full conversion table, the exact formula, and a calculator for any value."
url: https://atoneplace.net/convert/acres-to-square-miles/
site: "At One Place"
---

# Acres to square miles

**1 acre in square miles: 1 acre = 0.0015625 mi²**

mi² = acre × 0.0015625

To convert acres to square miles, multiply by 0.0015625. The table below gives the values people look up most often, and the converter works for any number.

## Acres to square miles table

*Common acre values converted to square miles.*

| Acres | Square miles |
| --- | --- |
| 1 acre | 0.0015625 |
| 2 acre | 0.003125 |
| 3 acre | 0.0046875 |
| 4 acre | 0.00625 |
| 5 acre | 0.0078125 |
| 10 acre | 0.015625 |
| 15 acre | 0.023438 |
| 20 acre | 0.03125 |
| 25 acre | 0.039063 |
| 30 acre | 0.046875 |
| 40 acre | 0.0625 |
| 50 acre | 0.078125 |
| 75 acre | 0.11719 |
| 100 acre | 0.15625 |
| 250 acre | 0.39063 |
| 500 acre | 0.78125 |
| 1,000 acre | 1.5625 |

## How the conversion works

The relationship is mi² = acre × 0.0015625. Both units measure area, so the conversion is a fixed factor that never changes.

## Common questions

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

One acre equals 0.0015625 square miles. mi² = acre × 0.0015625.

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

Use mi² = acre × 0.0015625. So 10 acre is 0.015625 mi².

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

One square mile equals 640 acres, which is the reverse of the conversion above.

## Related pages

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