Hectares to Square Miles
Convert hectares to square miles instantly. 1 ha = 0.0038610216 mi². Includes the exact factor, a conversion table of common values and the definition of both units.
How to convert hectares to square miles
To convert hectares to square miles, divide by 258.9988110336 (multiply by 0.0038610216). The relationship is fixed, so the same factor works for any quantity — there is nothing to look up and nothing that changes with temperature, location or context.
mi² = ha × 0.0038610216
Hectares to Square Miles conversion table
The values people look up most often, rounded for reading. Use the calculator above for anything in between.
| Hectares | Square Miles |
|---|---|
| 1 ha | 0.003861 mi² |
| 2 ha | 0.007722 mi² |
| 3 ha | 0.011583 mi² |
| 5 ha | 0.019305 mi² |
| 10 ha | 0.03861 mi² |
| 20 ha | 0.07722 mi² |
| 25 ha | 0.096526 mi² |
| 50 ha | 0.193051 mi² |
| 100 ha | 0.386102 mi² |
| 500 ha | 1.930511 mi² |
| 1,000 ha | 3.861022 mi² |
What is a hectare?
10,000 square metres, or about 2.471 acres. The global standard for farmland.
What is a square mile?
640 acres. Used for counties, states and weather-warning areas.
The formula
mi² = ha × 0.0038610216
Every result on this page comes from this formula. Nothing is rounded until the final display, so figures match a spreadsheet to the cent.
How to use the Hectares to Square Miles
- Type the number of hectares you want to convert.
- Read the result in square miles straight away — there is no button to press.
- Check the table below for the values that come up most often, or reverse the conversion with the linked square miles to hectares page.
Hectares to Square Miles — frequently asked questions
How many square miles are in a hectare?
One hectare equals 0.0038610216 mi². mi² = ha × 0.0038610216
What is the formula to convert hectares to square miles?
The formula is mi² = ha × 0.0038610216. It is an exact definition rather than an approximation, so the conversion never drifts no matter how large the number.
How do I convert square miles back to hectares?
Divide instead of multiplying: one square mile is 258.9988110336 ha. The reverse converter is linked in the related tools list.
Is this conversion exact?
Yes. Both units are defined against the same base unit by international agreement, so the factor is exact — any rounding you see is only in the display, which you can widen by entering more decimal places.
Is this hectares to square miles free to use?
Yes. Every calculator on the site is free, needs no sign-up, and runs entirely in your browser, so your figures never leave your device.
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About this calculator
Written and reviewed by The Samsung Calculator editorial team. Every calculator is written against a published formula, reviewed against at least one independent reference implementation, and dated when it changes.
Last reviewed August 15, 2026 · Calculation runs client-side · No data collected · Report an error