Convert Square Miles to Hectares
Convert Square Miles to Hectares instantly. 1 Square Mile (mi²) equals 258.9988 Hectares (ha).
Square Miles to Hectares conversion table
| Square Miles (mi²) | Hectares (ha) |
|---|---|
| 1 mi² | 258.9988 ha |
| 2 mi² | 517.9976 ha |
| 3 mi² | 776.9964 ha |
| 5 mi² | 1,294.99 ha |
| 10 mi² | 2,589.99 ha |
| 20 mi² | 5,179.98 ha |
| 50 mi² | 12,949.94 ha |
| 100 mi² | 25,899.88 ha |
| 500 mi² | 129,499.41 ha |
| 1,000 mi² | 258,998.81 ha |
1 Square Mile = 258.9988 Hectares · multiply Square Miles by 258.9988
About converting Square Miles to Hectares
Square Miles (mi²) and Hectares (ha) are both units of area, so converting between them is a single multiplication: multiply your Square Miles figure by 258.9988. Ten Square Miles comes to 2,589.99 Hectares, and a hundred works out at 25,899.88 Hectares.
Rule of thumb: going from Square Miles to Hectares multiplies, so the figure always grows — one Square Mile is already 258.9988 Hectares. If your answer came out smaller, you have the conversion the wrong way round.
What is a Square Mile?
A square mile is the area of a square one mile on a side, and in the United States it is the standard way to state the size of anything large: counties, states, metropolitan areas, wildfires and watersheds are all reported in square miles, along with population density in people per square mile. Elsewhere the same figure is given in square kilometers, which is why one lake can carry two very different-looking numbers depending on the source. The unit is literally built into the American landscape — the Public Land Survey System carved much of the country into square-mile sections, which is why the Midwest is a grid of mile-spaced roads.
What is a Hectare?
The hectare is the metric answer to the acre: a square 100 meters on a side, or 10,000 square meters. It is what farmland, forestry, plantation, conservation and deforestation figures are reported in almost everywhere outside the United States. A subtlety worth knowing is that the hectare is not actually an SI unit — like the liter, it is merely accepted for use alongside SI. The coherent unit for land really is the square meter, but nobody wants to state a country’s forest cover with that many zeroes, so the hectare was tolerated into permanence.
To put both in perspective: Manhattan is roughly 23 square miles, while a hectare is a square 100 meters on a side.
The converter above updates as you type, and the table lists common values for quick reference. Need the opposite direction? Use the Hectares to Square Miles converter, or browse all Area converters.
Frequently asked questions
How many Hectares are in one Square Mile?
There are 258.9988 Hectares in one Square Mile.
How do I convert Square Miles to Hectares?
Multiply the number of Square Miles by 258.9988. For example, 10 Square Miles = 2,589.99 Hectares.
What is 100 Square Miles in Hectares?
100 Square Miles is equal to 25,899.88 Hectares.
How do I convert Hectares to Square Miles?
Multiply the Hectares value by 0.003861 (or divide by 258.9988).
Is this Square Miles to Hectares conversion exact?
The definition is exact — Square Miles and Hectares are both fixed against the same base by international agreement — but the decimal shown here is rounded for readability, because the true ratio does not terminate. For engineering or scientific work, carry more decimal places than this page displays.
What is a Square Mile?
A square mile is the area of a square one mile on a side, and in the United States it is the standard way to state the size of anything large: counties, states, metropolitan areas, wildfires and watersheds are all reported in square miles, along with population density in people per square mile. Elsewhere the same figure is given in square kilometers, which is why one lake can carry two very different-looking numbers depending on the source. The unit is literally built into the American landscape — the Public Land Survey System carved much of the country into square-mile sections, which is why the Midwest is a grid of mile-spaced roads.
What is a Hectare?
The hectare is the metric answer to the acre: a square 100 meters on a side, or 10,000 square meters. It is what farmland, forestry, plantation, conservation and deforestation figures are reported in almost everywhere outside the United States. A subtlety worth knowing is that the hectare is not actually an SI unit — like the liter, it is merely accepted for use alongside SI. The coherent unit for land really is the square meter, but nobody wants to state a country’s forest cover with that many zeroes, so the hectare was tolerated into permanence.