Convert square miles to hectares
1 mi² = 258.998811034 ha — exactly. Both units are defined against the SI, so this factor is a fraction, not an approximation.
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Show this value in all 25 area units
- Square kilometers km² 2.589 988 110 34
- Square hectometers hm² 258.998 811 034
- Square decameters dam² 25 899.881 103 4
- Square meters m² 2 589 988.110 34
- Square decimeters dm² 258 998 811.034
- Square centimeters cm² 25 899 881 103.4
- Square millimeters mm² 2 589 988 110 340
- Square micrometers µm² 2.58998811034e+18
- Square nanometers nm² 2.58998811034e+24
- Hectares ha 258.998 811 034
- Ares a 25 899.881 103 4
- Decares daa 2589.988 110 34
- Square inches in² 4 014 489 600
- Square feet ft² 27 878 400
- Square yards yd² 3 097 600
- Square miles mi² 1
- Acres ac 640
- Roods ro 2560
- Square rods rd² 102 400
- Sections section 1
- Townships twp 0.027 777 777 777 8
- Roofing squares sq 278 784
- Circular mils cmil 5 111 406 910 650 000
- Barns b 2.58998811034e+34
- Tsubos 坪 783 471.403 377
Every row is Square mile (mi²) converted through the square meter, in exact rational arithmetic.
How to convert square miles to hectares
Multiply the number of square miles by 258.998811034 to get hectares.
The exact factor is 258.9988110336 — as a fraction, 2529285264/9765625.
Hectare: The standard land-area unit almost everywhere outside the US.
Square mile to Hectare conversion table
| Square miles (mi²) | Hectares (ha) |
|---|---|
| 1 mi² | 258.998 81 |
| 2 mi² | 517.997 62 |
| 3 mi² | 776.996 43 |
| 5 mi² | 1294.9941 |
| 10 mi² | 2589.9881 |
| 20 mi² | 5179.9762 |
| 25 mi² | 6474.9703 |
| 50 mi² | 12 949.941 |
| 100 mi² | 25 899.881 |
| 250 mi² | 64 749.703 |
| 500 mi² | 129 499.41 |
| 1000 mi² | 258 998.81 |
Hectare to Square mile conversion table
| Hectares (ha) | Square miles (mi²) |
|---|---|
| 1 ha | 0.003 861 021 6 |
| 2 ha | 0.007 722 043 2 |
| 3 ha | 0.011 583 065 |
| 5 ha | 0.019 305 108 |
| 10 ha | 0.038 610 216 |
| 20 ha | 0.077 220 432 |
| 25 ha | 0.096 525 54 |
| 50 ha | 0.193 051 08 |
| 100 ha | 0.386 102 16 |
| 250 ha | 0.965 255 4 |
| 500 ha | 1.930 510 8 |
| 1000 ha | 3.861 021 6 |
Frequently asked
How many hectares are in a square mile?
One square mile equals 258.998811 hectares (mi² → ha). That figure is exact, not rounded.
How do you convert square miles to hectares?
Multiply the number of square miles by 258.998811034 to get hectares.
What is 1 ha in square miles?
One hectare is 0.003861021585 square miles.
What is 10 mi² in ha?
10 mi² = 2589.9881 ha.
What exactly is a hectare?
The standard land-area unit almost everywhere outside the US.