A square mile is 640 acres.
Square mile to Hectare
Convert Square mile to Hectare instantly. Free online agriculture unit converter with exact formula, conversion table and FAQ.
Reserved for a responsive leaderboard above the conversion details.
Professional calculator style
World-scale conversion engine
30+ categories
6,500+ units
Instant results
Offline ready
Converter
Length Converter
Convert metric, imperial, and nautical distance units.
Context values
Some unit families need one extra value for a physically accurate result.
A hectare is 10,000 square meters.
1 mi2 = 258.998811 ha
Results update instantly for Square mile to Hectare conversions.
Reserved above the conversion cards and below the converter.
Formula
1 mi2 = 258.998811 ha
value in ha = value in mi2 × 258.998811
value in mi2 = value in ha × 0.003861021585
Conversion table
| 1 mi2 | 258.998811 ha |
| 2 mi2 | 517.9976221 ha |
| 5 mi2 | 1294.994055 ha |
| 10 mi2 | 2589.98811 ha |
| 20 mi2 | 5179.976221 ha |
| 50 mi2 | 12949.94055 ha |
| 100 mi2 | 25899.8811 ha |
Related conversions
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How do I convert square mile to hectare?
Multiply the square mile value by 258.998811 to get hectare. For example, 1 mi2 = 258.998811 ha.
What is the formula for square mile to hectare?
Use the formula: value in ha = value in mi2 × 258.998811. To convert back, value in mi2 = value in ha ÷ 258.998811.
Is the square mile to hectare conversion exact?
Yes. Both units belong to the same area family, so the factor 258.998811 gives an exact, direct conversion.
Where is the square mile unit commonly used?
It is commonly used in agriculture and agronomy for area calculations such as field records, fertilizer and seed planning, or irrigation and yield tracking.
Reserved between the FAQ and the article so the page stays balanced.
About this conversion
Square mile and Hectare are units used in the Universal Converter agriculture category. Square mile (mi2): A square mile is 640 acres. Hectare (ha): A hectare is 10,000 square meters.
Both units belong to the area family, so the conversion factor above is a direct, exact scale relationship between square mile and hectare.