# Convert acres to square kilometers

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

acres (acre)
1 acres = 0.004 square kilometers

## Precise decimal and fraction answers

The conversion in square kilometers rounded to six significant decimal places is 1 acre = 0.00404686 km2. The precise fraction answer is 19/4695 km2.

### Decimal Precision

Conversion from one to ten decimal places

• 1 acre = 0.004 km2
• 1 acre = 0.0040 km2
• 1 acre = 0.00405 km2
• 1 acre = 0.004047 km2
• 1 acre = 0.0040469 km2
• 1 acre = 0.00404686 km2
• 1 acre = 0.004046856 km2
• 1 acre = 0.0040468564 km2
• 1 acre = 0.00404685642 km2
• 1 acre = 0.004046856422 km2

## Acres to square kilometers conversion factor and formulas

Formula

The conversion factor between acres and square kilometers is 247.105. This represents the ratio of acres per one square kilometer. To calculate the value in square kilometers, we can either divide by the conversion factor or multiply by its inverse.

### Division

To convert from acres to square kilometers, divide acres by 247.105.
The formula is expressed as:
acre ÷ 247.105 = km2

### Multiplication

Alternatively we can multiply by the inverse conversion factor to get the same result.
The inverse of 247.105 is 1/247.105 or 0.004. To convert from acres to square kilometers, multiply acres by 0.004.
The formula is expressed as:
acre × 0.004 = km2

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

## Reverse this conversion

Convert from square kilometers 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 square kilometers conversion table

acre km2
1 acre 0.004 km2
2 acre 0.008 km2
3 acre 0.012 km2
4 acre 0.016 km2
5 acre 0.02 km2
6 acre 0.024 km2
7 acre 0.028 km2
8 acre 0.032 km2
9 acre 0.036 km2
10 acre 0.04 km2
acre km2
20 acre 0.081 km2
30 acre 0.121 km2
40 acre 0.162 km2
50 acre 0.202 km2
60 acre 0.243 km2
70 acre 0.283 km2
80 acre 0.324 km2
90 acre 0.364 km2
100 acre 0.405 km2
1,000 acre 4.047 km2