# Convert acres to hectares

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

acres (acre)
1 acres = 0.405 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.

### Decimal Precision

Conversion from one to ten decimal places

• 1 acre = 0.4 ha
• 1 acre = 0.40 ha
• 1 acre = 0.405 ha
• 1 acre = 0.4047 ha
• 1 acre = 0.40469 ha
• 1 acre = 0.404686 ha
• 1 acre = 0.4046856 ha
• 1 acre = 0.40468564 ha
• 1 acre = 0.404685642 ha
• 1 acre = 0.4046856422 ha

## Acres to hectares conversion factor and formulas

Formula

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

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) .

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 acres instead.

## 1 acres to other area units

### Metric

• 1 acre = 0.405 ha
• 1 acre = 0.004 km2
• 1 acre = 4,046.856 m2
• 1 acre = 404,685.642 dm2
• 1 acre = 4.047×107 cm2
• 1 acre = 4.047×109 mm2
• 1 acre = 4.047×1015 µ2
• 1 acre = 4.047×1021 nm2

### Imperial/U.S.

• 1 acre = 1 acre
• 1 acre = 0.002 sq mi
• 1 acre = 4,840 sq yd
• 1 acre = 43,560 sq ft
• 1 acre = 6,272,640 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)

## Acres to hectares conversion table

acre ha
1 acre 0.405 ha
2 acre 0.809 ha
3 acre 1.214 ha
4 acre 1.619 ha
5 acre 2.023 ha
6 acre 2.428 ha
7 acre 2.833 ha
8 acre 3.237 ha
9 acre 3.642 ha
10 acre 4.047 ha
acre ha
20 acre 8.094 ha
30 acre 12.141 ha
40 acre 16.187 ha
50 acre 20.234 ha
60 acre 24.281 ha
70 acre 28.328 ha
80 acre 32.375 ha
90 acre 36.422 ha
100 acre 40.469 ha
1,000 acre 404.686 ha