---
title: "40 ha to km² = 0.4 km²"
description: "40 hectares is 0.4 square kilometers. The arithmetic, a table of nearby values, and a converter for any other number."
url: https://atoneplace.net/convert/40-hectares-to-square-km/
site: "At One Place"
---

# 40 ha to km²

**40 hectares in square kilometers: 40 ha = 0.4 km²**

km² = ha × 0.01

40 hectares is 0.4 square kilometers. To get there, multiply by 0.01.

## Values either side

*Hectares near 40, converted to square kilometers.*

| Hectares | Square kilometers |
| --- | --- |
| 32 ha | 0.32 |
| 35 ha | 0.35 |
| 36 ha | 0.36 |
| 37 ha | 0.37 |
| 40 ha ← | 0.4 |
| 45 ha | 0.45 |
| 50 ha | 0.5 |
| 55 ha | 0.55 |
| 60 ha | 0.6 |

## How the conversion works

The relationship is km² = ha × 0.01. Both units measure area, so the conversion is a fixed factor that never changes.

## Common questions

### What is 40 ha in square kilometers?

40 ha is 0.4 km².

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

Multiply by 0.01.

## Related pages

- [Hectares to square kilometers](https://atoneplace.net/convert/hectares-to-square-km/)
- [40 km² to ha](https://atoneplace.net/convert/40-square-km-to-hectares/)
- [32 ha to km²](https://atoneplace.net/convert/32-hectares-to-square-km/)
- [35 ha to km²](https://atoneplace.net/convert/35-hectares-to-square-km/)
- [36 ha to km²](https://atoneplace.net/convert/36-hectares-to-square-km/)
- [37 ha to km²](https://atoneplace.net/convert/37-hectares-to-square-km/)
- [45 ha to km²](https://atoneplace.net/convert/45-hectares-to-square-km/)
- [50 ha to km²](https://atoneplace.net/convert/50-hectares-to-square-km/)
- [55 ha to km²](https://atoneplace.net/convert/55-hectares-to-square-km/)
- [60 ha to km²](https://atoneplace.net/convert/60-hectares-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/)