Square mile to Hectare Converter
Type a value — the answer appears instantly. 1 mi² = 258.999 ha.
Reviewed by the OmniCalc teamMethod verified 2026-07-01
258.999 hectares
= 2,589,990 m²= 27,878,400 ft²
equals 258.999 hectaresFormula: ha = mi² × 258.99881
Square mile to Hectare formula
ha = mi² × 258.99881
Convert 5 square miles to hectares
- Start with 5 square miles.
- Multiply by the conversion factor: 5 × 258.999 = 1,294.99.
- So 5 mi² = 1,294.99 ha.
Square mile to Hectare conversion table
| Square miles (mi²) | Hectares (ha) |
|---|---|
| 0.01 mi² | 2.58999 ha |
| 0.1 mi² | 25.8999 ha |
| 0.25 mi² | 64.7497 ha |
| 0.5 mi² | 129.499 ha |
| 1 mi² | 258.999 ha |
| 2 mi² | 517.998 ha |
| 3 mi² | 776.996 ha |
| 4 mi² | 1,036 ha |
| 5 mi² | 1,294.99 ha |
| 6 mi² | 1,553.99 ha |
| 7 mi² | 1,812.99 ha |
| 8 mi² | 2,071.99 ha |
| 9 mi² | 2,330.99 ha |
| 10 mi² | 2,589.99 ha |
| 15 mi² | 3,884.98 ha |
| 20 mi² | 5,179.98 ha |
| 25 mi² | 6,474.97 ha |
| 30 mi² | 7,769.96 ha |
| 40 mi² | 10,360 ha |
| 50 mi² | 12,949.9 ha |
| 75 mi² | 19,424.9 ha |
| 100 mi² | 25,899.9 ha |
| 250 mi² | 64,749.7 ha |
| 500 mi² | 129,499 ha |
| 1,000 mi² | 258,999 ha |
| 5,000 mi² | 1,294,990 ha |
| 10,000 mi² | 2,589,990 ha |
Unit definitions
What is a square mile?
The square mile is the area of a one-mile square, containing 640 acres or about 2.59 square kilometres. It is used for large land areas, counties, and statistical regions in the United States. One square mile is roughly 259 hectares.
What is a hectare?
The hectare is exactly 10,000 square metres, the area of a 100-metre square. It is the standard metric unit for measuring land, farms, and forests. One hectare is about 2.471 acres.
Frequently asked questions
How many hectares are in one square mile?
One square mile equals 258.999 hectares (1 mi² = 258.999 ha).
How do I convert square miles to hectares?
Multiply the value in square miles by 258.999. For example, 10 mi² × 258.999 = 2,589.99 ha.
Which is bigger — a square mile or a hectare?
A square mile is bigger: one square mile contains 258.999 hectares.
Is this square mile to hectare converter free?
Yes — the converter is free, works offline once loaded, and computes instantly in your browser without sending your numbers to a server.
Conversion factors follow international definitions (SI / NIST). Last verified 2026-07-01.