Convert Hectares to Square Miles
Hectares to square miles is the conversion you need when a land area given in hectares has to be read against the much larger square mile. One hectare is only about 0.00386102 square miles, so the number gets far smaller when you switch from hectares to square miles.
Hectares to Square miles conversion table
| Hectares (ha) | Square miles (mi²) |
|---|---|
| 1 | 0.003861 |
| 2 | 0.007722 |
| 3 | 0.011583 |
| 5 | 0.019305 |
| 10 | 0.03861 |
| 20 | 0.07722 |
| 50 | 0.193051 |
| 100 | 0.386102 |
| 500 | 1.930511 |
| 1,000 | 3.861022 |
The formula
To convert hectares to square miles, multiply the area in hectares by approximately 0.00386102:
square miles = hectares × 0.00386102
A worked example
Say you have a 100-hectare tract and want that area in square miles:
100 × 0.00386102 = 0.38610216 mi²
So 100 hectares is about 0.38610216 square miles (the full value is 0.38610215854244584). For a metric anchor, 100 hectares is also exactly 1 square kilometer.
Why it's an approximation
The hectare is a metric area and the square mile is an imperial one, and the two are linked through a conversion that never resolves to a round number. One hectare comes out to 0.003861021585424458 square miles, a value with digits that keep going, so you always round it somewhere. That rounding is why the hectare-to-square-miles conversion is an approximation rather than an exact figure.
When you'll use it
Sizing up large tracts of land, farms, or nature reserves against square miles, comparing metric area data with US maps and reports, and getting a sense of how a hectare figure stacks up on the much bigger square-mile scale.
Frequently asked questions
How many square miles are in a hectare?
About 0.00386102 square miles. A hectare is a small slice of a square mile, so the number comes out tiny.
Is the hectare to square mile conversion exact?
No. The factor is 0.003861021585424458 square miles per hectare, a value whose digits keep running, so any number you use is rounded. Multiplying by about 0.00386102 is close enough for most work.
How many hectares are in a square mile?
About 259 hectares make up a square mile. It's a handy check: 100 hectares equals exactly 1 square kilometer, and a square mile is a good deal bigger than a square kilometer.