How to convert hectares to square miles
Hectares and Square Miles both measure area, so converting is a single multiplication. One ha equals 0.003861 mi², so you multiply your hectares value by 0.003861.
Formula: square miles = hectares × 0.003861. For example, 10 ha = 0.03861 mi².
Hectares to Square Miles conversion table
| Hectares (ha) | Square Miles (mi²) |
|---|---|
| 1 | 0.003861 |
| 2 | 0.007722 |
| 5 | 0.019305 |
| 10 | 0.03861 |
| 25 | 0.096526 |
| 50 | 0.193051 |
| 100 | 0.386102 |
| 1,000 | 3.861022 |
Hectares and Square Miles explained
Hectares (ha): Ten thousand square metres, the metric unit for land area.
Square Miles (mi²): An imperial unit for large areas of land.
When you'd convert hectares to square miles
You'll convert hectares to square miles whenever a measurement is given in one unit but you need it in the other — comparing hectares and square miles figures across regions, following a recipe or spec, or double-checking a number. Because 1 ha is exactly 0.003861 mi², the result is precise every time.
Frequently asked questions
How many square miles are in a hectare?
One ha equals 0.003861 mi². Multiply your hectares figure by 0.003861 to get square miles.
What is the formula to convert hectares to square miles?
square miles = hectares × 0.003861. The factor 0.003861 is exact.
What is 2 hectares in square miles?
2 ha = 0.007722 mi². You can enter any value in the converter above to get an instant result.
Is this Hectares to Square Miles converter accurate?
Yes. It uses the standard conversion factor (1 ha = 0.003861 mi²) defined by BIPM — SI Brochure (derived units), so results are exact to several decimal places.