How to convert square miles to hectares
Square Miles and Hectares both measure area, so converting is a single multiplication. One mi² equals 258.998811 ha, so you multiply your square miles value by 258.998811.
Formula: hectares = square miles × 258.998811. For example, 10 mi² = 2,589.98811 ha.
Square Miles to Hectares conversion table
| Square Miles (mi²) | Hectares (ha) |
|---|---|
| 1 | 258.998811 |
| 2 | 517.997622 |
| 5 | 1,294.994055 |
| 10 | 2,589.98811 |
| 25 | 6,474.970275 |
| 50 | 12,949.94055 |
| 100 | 25,899.8811 |
| 1,000 | 258,998.811 |
Square Miles and Hectares explained
Square Miles (mi²): An imperial unit for large areas of land.
Hectares (ha): Ten thousand square metres, the metric unit for land area.
When you'd convert square miles to hectares
You'll convert square miles to hectares whenever a measurement is given in one unit but you need it in the other — comparing square miles and hectares figures across regions, following a recipe or spec, or double-checking a number. Because 1 mi² is exactly 258.998811 ha, the result is precise every time.
Frequently asked questions
How many hectares are in a square mile?
One mi² equals 258.998811 ha. Multiply your square miles figure by 258.998811 to get hectares.
What is the formula to convert square miles to hectares?
hectares = square miles × 258.998811. The factor 258.998811 is exact.
What is 2 square miles in hectares?
2 mi² = 517.997622 ha. You can enter any value in the converter above to get an instant result.
Is this Square Miles to Hectares converter accurate?
Yes. It uses the standard conversion factor (1 mi² = 258.998811 ha) defined by BIPM — SI Brochure (derived units), so results are exact to several decimal places.