# Convert hectares to square miles

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

hectares (ha)
1 hectares = 0.004 square miles

## Precise decimal and fraction answers

The conversion in square miles rounded to six significant decimal places is 1 ha = 0.00386102 sq mi. The precise fraction answer is 841/217818 sq mi.

### Decimal Precision

Conversion from one to ten decimal places

• 1 ha = 0.004 sq mi
• 1 ha = 0.0039 sq mi
• 1 ha = 0.00386 sq mi
• 1 ha = 0.003861 sq mi
• 1 ha = 0.0038610 sq mi
• 1 ha = 0.00386102 sq mi
• 1 ha = 0.003861022 sq mi
• 1 ha = 0.0038610216 sq mi
• 1 ha = 0.00386102159 sq mi
• 1 ha = 0.003861021585 sq mi

## Hectares to square miles conversion factor and formulas

Formula

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

### Division

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

### Multiplication

Alternatively we can multiply 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 hectares to square miles, multiply hectares by 0.004.
The formula is expressed as:
ha × 0.004 = sq mi

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

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 square miles to hectares instead.

## 1 hectares to other area units

### Metric

• 1 ha = 1 ha
• 1 ha = 0.01 km2
• 1 ha = 10,000 m2
• 1 ha = 1,000,000 dm2
• 1 ha = 1×108 cm2
• 1 ha = 1×1010 mm2
• 1 ha = 1×1016 µ2
• 1 ha = 1×1022 nm2

### Imperial/U.S.

• 1 ha = 2.471 acre
• 1 ha = 0.004 sq mi
• 1 ha = 11,959.9 sq yd
• 1 ha = 107,639.104 sq ft
• 1 ha = 1.55×107 sq in

## References and Citations

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

## Hectares to square miles conversion table

ha sq mi
1 ha 0.004 sq mi
2 ha 0.008 sq mi
3 ha 0.012 sq mi
4 ha 0.015 sq mi
5 ha 0.019 sq mi
6 ha 0.023 sq mi
7 ha 0.027 sq mi
8 ha 0.031 sq mi
9 ha 0.035 sq mi
10 ha 0.039 sq mi
ha sq mi
20 ha 0.077 sq mi
30 ha 0.116 sq mi
40 ha 0.154 sq mi
50 ha 0.193 sq mi
60 ha 0.232 sq mi
70 ha 0.27 sq mi
80 ha 0.309 sq mi
90 ha 0.347 sq mi
100 ha 0.386 sq mi
1,000 ha 3.861 sq mi