---
title: "1 acre to km² = 0.0040469 km²"
description: "1 acre is 0.0040469 square kilometers. The arithmetic, a table of nearby values, and a converter for any other number."
url: https://atoneplace.net/convert/1-acres-to-square-km/
site: "At One Place"
---

# 1 acre to km²

**1 acre in square kilometers: 1 acre = 0.0040469 km²**

km² = acre × 0.004046856422

1 acre is 0.0040469 square kilometers. To get there, multiply by 0.004046856422.

## Values either side

*Acres near 1, converted to square kilometers.*

| Acres | Square kilometers |
| --- | --- |
| 0.5 acre | 0.0020234 |
| 1 acre ← | 0.0040469 |
| 1.5 acre | 0.0060703 |
| 2 acre | 0.0080937 |
| 2.5 acre | 0.010117 |
| 3 acre | 0.012141 |

## How the conversion works

The relationship is km² = acre × 0.004046856422. Both units measure area, so the conversion is a fixed factor that never changes.

## Common questions

### What is 1 acre in square kilometers?

1 acre is 0.0040469 km².

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

Multiply by 0.004046856422.

## Related pages

- [Acres to square kilometers](https://atoneplace.net/convert/acres-to-square-km/)
- [1 km² to acre](https://atoneplace.net/convert/1-square-km-to-acres/)
- [0.5 acre to km²](https://atoneplace.net/convert/0-5-acres-to-square-km/)
- [1.5 acre to km²](https://atoneplace.net/convert/1-5-acres-to-square-km/)
- [2 acre to km²](https://atoneplace.net/convert/2-acres-to-square-km/)
- [2.5 acre to km²](https://atoneplace.net/convert/2-5-acres-to-square-km/)
- [3 acre to km²](https://atoneplace.net/convert/3-acres-to-square-km/)

## 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/)