---
title: "Acres to Square kilometers — acre to km² converter"
description: "1 acre = 0.0040469 square kilometers. Convert acres to square kilometers with a full conversion table, the exact formula, and a calculator for any value."
url: https://atoneplace.net/convert/acres-to-square-km/
site: "At One Place"
---

# Acres to square kilometers

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

km² = acre × 0.004046856422

To convert acres to square kilometers, multiply by 0.004046856422. The table below gives the values people look up most often, and the converter works for any number.

## Acres to square kilometers table

*Common acre values converted to square kilometers.*

| Acres | Square kilometers |
| --- | --- |
| 1 acre | 0.0040469 |
| 2 acre | 0.0080937 |
| 3 acre | 0.012141 |
| 4 acre | 0.016187 |
| 5 acre | 0.020234 |
| 10 acre | 0.040469 |
| 15 acre | 0.060703 |
| 20 acre | 0.080937 |
| 25 acre | 0.10117 |
| 30 acre | 0.12141 |
| 40 acre | 0.16187 |
| 50 acre | 0.20234 |
| 75 acre | 0.30351 |
| 100 acre | 0.40469 |
| 250 acre | 1.011714 |
| 500 acre | 2.023428 |
| 1,000 acre | 4.046856 |

## 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

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

One acre equals 0.0040469 square kilometers. km² = acre × 0.004046856422.

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

Use km² = acre × 0.004046856422. So 10 acre is 0.040469 km².

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

One square kilometer equals 247.1054 acres, which is the reverse of the conversion above.

## Related pages

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