---
title: "40 acre to mi² = 0.0625 mi²"
description: "40 acres is 0.0625 square miles. The arithmetic, a table of nearby values, and a converter for any other number."
url: https://atoneplace.net/convert/40-acres-to-square-miles/
site: "At One Place"
---

# 40 acre to mi²

**40 acres in square miles: 40 acre = 0.0625 mi²**

mi² = acre × 0.0015625

40 acres is 0.0625 square miles. To get there, multiply by 0.0015625.

## Values either side

*Acres near 40, converted to square miles.*

| Acres | Square miles |
| --- | --- |
| 32 acre | 0.05 |
| 35 acre | 0.054688 |
| 36 acre | 0.05625 |
| 37 acre | 0.057813 |
| 40 acre ← | 0.0625 |
| 45 acre | 0.070313 |
| 50 acre | 0.078125 |
| 55 acre | 0.085938 |
| 60 acre | 0.09375 |

## 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

### What is 40 acre in square miles?

40 acre is 0.0625 mi².

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

Multiply by 0.0015625.

## Related pages

- [Acres to square miles](https://atoneplace.net/convert/acres-to-square-miles/)
- [40 mi² to acre](https://atoneplace.net/convert/40-square-miles-to-acres/)
- [32 acre to mi²](https://atoneplace.net/convert/32-acres-to-square-miles/)
- [35 acre to mi²](https://atoneplace.net/convert/35-acres-to-square-miles/)
- [36 acre to mi²](https://atoneplace.net/convert/36-acres-to-square-miles/)
- [37 acre to mi²](https://atoneplace.net/convert/37-acres-to-square-miles/)
- [45 acre to mi²](https://atoneplace.net/convert/45-acres-to-square-miles/)
- [50 acre to mi²](https://atoneplace.net/convert/50-acres-to-square-miles/)
- [55 acre to mi²](https://atoneplace.net/convert/55-acres-to-square-miles/)
- [60 acre to mi²](https://atoneplace.net/convert/60-acres-to-square-miles/)

## 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/)