---
title: "Hectares to Square miles — ha to mi² converter"
description: "1 hectare = 0.003861 square miles. Convert hectares to square miles with a full conversion table, the exact formula, and a calculator for any value."
url: https://atoneplace.net/convert/hectares-to-square-miles/
site: "At One Place"
---

# Hectares to square miles

**1 hectare in square miles: 1 ha = 0.003861 mi²**

mi² = ha × 0.003861021585

To convert hectares to square miles, multiply by 0.003861021585. The table below gives the values people look up most often, and the converter works for any number.

## Hectares to square miles table

*Common hectare values converted to square miles.*

| Hectares | Square miles |
| --- | --- |
| 1 ha | 0.003861 |
| 2 ha | 0.007722 |
| 3 ha | 0.011583 |
| 4 ha | 0.015444 |
| 5 ha | 0.019305 |
| 10 ha | 0.03861 |
| 15 ha | 0.057915 |
| 20 ha | 0.07722 |
| 25 ha | 0.096526 |
| 30 ha | 0.11583 |
| 40 ha | 0.15444 |
| 50 ha | 0.19305 |
| 75 ha | 0.28958 |
| 100 ha | 0.3861 |
| 250 ha | 0.96526 |
| 500 ha | 1.930511 |
| 1,000 ha | 3.861022 |

## How the conversion works

The relationship is mi² = ha × 0.003861021585. Both units measure area, so the conversion is a fixed factor that never changes.

## Common questions

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

One hectare equals 0.003861 square miles. mi² = ha × 0.003861021585.

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

Use mi² = ha × 0.003861021585. So 10 ha is 0.03861 mi².

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

One square mile equals 258.9988 hectares, which is the reverse of the conversion above.

## Related pages

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