Convert acres to hectares

Precise decimal and fraction answers

The conversion in hectares rounded to six significant decimal places is 1 acre = 0.404686 ha. The precise fraction answer is ³⁸⁰/₉₃₉ ha.

Acres to hectares conversion factor and formulas

The conversion factor between acres and hectares is 2.471. This represents the ratio of acres per one hectare. To calculate the value in hectares, we can either divide by the conversion factor or multiply by its inverse.

Division

To convert from acres to hectares, divide acres by 2.471.
The formula is expressed as:
acre ÷ 2.471 = ha

Multiplication

Alternatively we can multiply by the inverse conversion factor to get the same result.
The inverse of 2.471 is 1/2.471 or 0.405. To convert from acres to hectares, multiply acres by 0.405.
The formula is expressed as:
acre × 0.405 = ha

About this conversion

Converting acres to hectares is a conversion between units from separate unit systems - acres 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 acres 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)