📏 Square miles to Hectares Converter
Convert square miles (mi²) to hectares (ha) instantly, with the formula, a worked example and a conversion table.
Quick answer: 1 square mile (mi²) = 258.99881 hectares (ha). Formula: ha = mi² × 258.99881.
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Square miles to Hectares Converter inputs
Result
Square miles to Hectares conversion table
| Square miles (mi²) | Hectares (ha) |
|---|---|
| 0.1 mi² | 25.899881 ha |
| 0.5 mi² | 129.49941 ha |
| 1 mi² | 258.99881 ha |
| 2 mi² | 517.99762 ha |
| 3 mi² | 776.99643 ha |
| 5 mi² | 1,294.9941 ha |
| 10 mi² | 2,589.9881 ha |
| 20 mi² | 5,179.9762 ha |
| 25 mi² | 6,474.9703 ha |
| 50 mi² | 12,949.941 ha |
| 100 mi² | 25,899.881 ha |
| 1,000 mi² | 258,998.81 ha |
Other area conversions
How to convert square miles to hectares
Multiply the number of square miles by 258.99881 to get hectares: ha = mi² × 258.99881.
Example: 5 mi² = 1,294.9941 ha.
The square mile (mi²) and the hectare (ha) are both units of area. Need the opposite direction? Use the ha to mi² converter.
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Metric and imperial units
The metric system (SI) is used by almost every country and by science worldwide. Its units scale by powers of ten – 1 kilometer is 1,000 meters, 1 meter is 100 centimeters – which makes conversions inside the system easy. The imperial and US customary systems (inches, feet, pounds, gallons) are still used daily in the United States and partly in the UK.
Since 1959 the inch has been defined as exactly 2.54 centimeters and the pound as exactly 0.45359237 kilograms, so conversions between the two systems are exact. Note that a US gallon (3.785 L) and an imperial gallon (4.546 L) are different – choose the right one above.
This converter covers 10 categories and 66 units: length, weight, temperature, volume, area, speed, time, data, energy, pressure.
Frequently asked questions
How many hectares are in a square mile?
1 square mile = 258.99881 hectares.
How do I convert square miles to hectares?
Use the formula ha = mi² × 258.99881. For example, 5 mi² = 1,294.9941 ha.
How do I convert hectares back to square miles?
1 hectare = 0.0038610216 square miles. Use the ha to mi² converter linked on this page.
Are these conversions exact?
Yes – all factors use the internationally defined values (for example 1 inch = 2.54 cm exactly, 1 pound = 0.45359237 kg exactly). Results are rounded to 8 significant digits for display.