How to convert square miles to hectares
To convert a measurement in square miles to hectares, multiply the value by 258.998811. The conversion factor comes from the relationship between both units and the square meter.
For example, to convert 5 mi² to hectares: 5 × 258.998811 = 1,294.9941 ha.
What is a square mile?
A square mile is an imperial and US customary unit of area equal to the area of a square one mile on each side, or 640 acres, about 2.59 square kilometers. The square mile is the traditional unit for large land areas in the US and UK. In the US Public Land Survey System, a 'section' is exactly one square mile, the building block of the township grid.
Common uses of square miles include: Areas of US and UK cities and counties; Land survey sections (640 acres); Geographic and census area reporting; Property and ranch land in imperial countries.
What is a hectare?
A hectare is a metric unit of area equal to 10,000 square meters, or a square 100 meters on each side, about 2.471 acres. Coined in 1795 from the Greek 'hekaton' (hundred) and 'are', the hectare is the standard unit for land area in agriculture and forestry across most of the world, filling the gap between the square meter and the square kilometer.
Common uses of hectares include: Farmland and agricultural plot size; Forestry and conservation areas; Real estate land parcels; Parks and land-use planning.
Square Miles to hectares worked examples
Here are some common values converted:
1 mi² = 258.998811 ha 5 mi² = 1,294.9941 ha 10 mi² = 2,589.9881 ha 50 mi² = 12,949.9406 ha 100 mi² = 25,899.8811 ha
Frequently asked questions
How many hectares are in one square mile?
One square mile (mi²) equals 258.998811 hectares (ha). Multiply any value in square miles by 258.998811 to convert to hectares.
How do I convert square miles to hectares?
Multiply the value in square miles by 258.998811. For example, 5 mi² × 258.998811 = 1,294.9941 ha.
How do I convert hectares to square miles?
Multiply the value in hectares by 0.003861021585, or divide by 258.998811. Use the swap button on the converter above to reverse the direction.
Is the square mile to hectare conversion exact?
Yes. Area conversions derive from the exact 1959 international definitions of the meter, yard, and foot, so the factors are exact.
What is the formula for square miles to hectares?
The formula is: ha = mi² × 258.998811. This comes from the definition of both units relative to the square meter.