Convert square miles to 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.

Square miles to hectares conversion factor and formulas

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

About this conversion

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) .

About Hectares

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.

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)