# Convert square miles to hectares

Enter the number of square miles you want to convert to hectares in the text box below. The conversion to area in hectares will update as you type.

square miles (sq mi)
1 square miles = 258.999 hectares

## Precise decimal and fraction answers

The conversion in hectares rounded to six significant decimal places is 1 sq mi = 258.998811 ha. The precise fraction answer is 258 840/841 ha.

### Decimal Precision

Conversion from one to ten decimal places

• 1 sq mi = 259.0 ha
• 1 sq mi = 259.00 ha
• 1 sq mi = 258.999 ha
• 1 sq mi = 258.9988 ha
• 1 sq mi = 258.99881 ha
• 1 sq mi = 258.998811 ha
• 1 sq mi = 258.9988110 ha
• 1 sq mi = 258.99881103 ha
• 1 sq mi = 258.998811034 ha
• 1 sq mi = 258.9988110336 ha

## Square miles to hectares conversion factor and formulas

Formula

The conversion factor between square miles and hectares is 258.999. This represents the ratio of hectares per one square mile. To calculate the value in hectares, we can either multiply by the conversion factor or divide by its inverse.

### Multiplication

To convert from square miles to hectares, multiply square miles by 258.999.
The formula is expressed as:
sq mi × 258.999 = ha

### Division

Alternatively we can divide by the inverse conversion factor to get the same result.
The inverse of 258.999 is 1/258.999 or 0.004. To convert from square miles to hectares, divide square miles by 0.004.
The formula is expressed as:
sq mi ÷ 0.004 = ha

Converting square miles to hectares is a conversion between units from separate unit systems - square miles are US Customary / UK Imperial defined units while hectares are metric (SI) .

SI Unit

The hectare is a metric measure of area defined by a square with sides 100 meters in length. One hundred hectares equal a square kilometer. The unit is widely used in the measure of large areas of land. While it is not an official SI unit, the hectare is fully compatible with the metric system and used in most countries which have adopted metric units.

## Reverse this conversion

Convert from hectares to square miles instead.

## 1 square miles to other area units

### Metric

• 1 sq mi = 258.999 ha
• 1 sq mi = 2.59 km2
• 1 sq mi = 2,589,988.11 m2
• 1 sq mi = 2.59×108 dm2
• 1 sq mi = 2.59×1010 cm2
• 1 sq mi = 2.59×1012 mm2
• 1 sq mi = 2.59×1018 µ2
• 1 sq mi = 2.59×1024 nm2

### Imperial/U.S.

• 1 sq mi = 640 acre
• 1 sq mi = 1 sq mi
• 1 sq mi = 3,097,600 sq yd
• 1 sq mi = 2.788×107 sq ft
• 1 sq mi = 4.014×109 sq in

## References and Citations

1. National Institute of Standards and Technology (NIST) General Tables of Units of Measurement
2. International Bureau of Weights and Measures (BIPM) The International System of Units (SI)

## Square miles to hectares conversion table

sq mi ha
1 sq mi 258.999 ha
2 sq mi 517.998 ha
3 sq mi 776.996 ha
4 sq mi 1,035.995 ha
5 sq mi 1,294.994 ha
6 sq mi 1,553.993 ha
7 sq mi 1,812.992 ha
8 sq mi 2,071.99 ha
9 sq mi 2,330.989 ha
10 sq mi 2,589.988 ha
sq mi ha
20 sq mi 5,179.976 ha
30 sq mi 7,769.964 ha
40 sq mi 10,359.952 ha
50 sq mi 12,949.941 ha
60 sq mi 15,539.929 ha
70 sq mi 18,129.917 ha
80 sq mi 20,719.905 ha
90 sq mi 23,309.893 ha
100 sq mi 25,899.881 ha
1,000 sq mi 258,998.811 ha