---
title: "1 km² to mi² = 0.3861 mi²"
description: "1 square kilometer is 0.3861 square miles. The arithmetic, a table of nearby values, and a converter for any other number."
url: https://atoneplace.net/convert/1-square-km-to-square-miles/
site: "At One Place"
---

# 1 km² to mi²

**1 square kilometer in square miles: 1 km² = 0.3861 mi²**

mi² = km² × 0.3861021585

1 square kilometer is 0.3861 square miles. To get there, multiply by 0.3861021585.

## Values either side

*Square kilometers near 1, converted to square miles.*

| Square kilometers | Square miles |
| --- | --- |
| 0.5 km² | 0.19305 |
| 1 km² ← | 0.3861 |
| 1.5 km² | 0.57915 |
| 2 km² | 0.7722 |
| 2.5 km² | 0.96526 |
| 3 km² | 1.158306 |

## How the conversion works

The relationship is mi² = km² × 0.3861021585. Both units measure area, so the conversion is a fixed factor that never changes.

## Common questions

### What is 1 km² in square miles?

1 km² is 0.3861 mi².

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

Multiply by 0.3861021585.

## Related pages

- [Square kilometers to square miles](https://atoneplace.net/convert/square-km-to-square-miles/)
- [1 mi² to km²](https://atoneplace.net/convert/1-square-miles-to-square-km/)
- [0.5 km² to mi²](https://atoneplace.net/convert/0-5-square-km-to-square-miles/)
- [1.5 km² to mi²](https://atoneplace.net/convert/1-5-square-km-to-square-miles/)
- [2 km² to mi²](https://atoneplace.net/convert/2-square-km-to-square-miles/)
- [2.5 km² to mi²](https://atoneplace.net/convert/2-5-square-km-to-square-miles/)
- [3 km² to mi²](https://atoneplace.net/convert/3-square-km-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/)