Square Kilometer to Acre Converter

Area Converter

20 units available

Decimals:

From

To

247.105381

1 km² = 247.105381 ac

Formula:

ac = km² × 247.1053814672

With your value: 1 km² = 247.10538147 ac

How big is that?

Everyday references on a logarithmic scale, all expressed in square kilometer so you can sanity-check the result.

Parking space (1/8.0e+4 your value)0.0000125 km²

Tennis court (1/3.8e+3 your value)0.000261 km²

Football pitch (1/1.4e+2 your value)0.00714 km²

Hectare (1/1.0e+2 your value)0.0100 km²

Your value1.00 km²

Central Park (3.4× your value)3.41 km²

Other Square Kilometer to Acre conversions

2 km² to ac 3 km² to ac 4 km² to ac 5 km² to ac 6 km² to ac 7 km² to ac 8 km² to ac

Square Kilometer to Acre Conversion Table

Square Kilometer (km²)	Acre (ac)
0.5	123.552691
1	247.105381
2	494.210763
5	1,235.526907
10	2,471.053815
15	3,706.580722
20	4,942.107629
25	6,177.634537
50	12,355.269073
100	24,710.538147
250	61,776.345367
500	123,552.690734
1000	247,105.381467

Acre to Square Kilometer Conversion Table

Acre (ac)	Square Kilometer (km²)
0.5	0.002023
1	0.004047
2	0.008094
5	0.020234
10	0.040469
15	0.060703
20	0.080937
25	0.101171
50	0.202343
100	0.404686
250	1.011714
500	2.023428
1000	4.046856

Where these values come from

Every factor on this page is traced to the document that defines it. See the full provenance dataset or our methodology.

Square Kilometer (km²)

Area

Exact conversion

Derived from the square metre via the length definitions above.

Source: NIST Special Publication 811, Guide for the Use of the International System of Units

National Institute of Standards and Technology (US) · Reviewed 2026-07-01

Acre (ac)

Area

Exact conversion

Derived from the square metre via the length definitions above.

Source: NIST Special Publication 811, Guide for the Use of the International System of Units

National Institute of Standards and Technology (US) · Reviewed 2026-07-01

How to Convert Square Kilometer to Acre

To convert from Square Kilometer (km²) to Acre (ac), multiply the value by 247.1053814672.

Formula: ac = km² × 247.1053814672

Reverse: km² = ac × 0.0040468564

Step-by-Step Example

Start with your value in Square Kilometer. For example: 5 km²
Multiply by the conversion factor: 5 x 247.1053814672
The result is: 1,235.526907 ac

About Square Kilometer

The square kilometer (km²) is a unit of area. One square kilometer equals 1.000000 × 10^+6 square metres. UnitConvertLab converts it against every other area unit using this exact definition, so results are reproducible to full double precision rather than rounded lookup tables.

Common uses: area calculations, engineering and science, education.

About Acre

The acre is a unit of land area equal to 43,560 square feet or about 4,047 square meters. It is used primarily in the US, UK, and former British colonies.

Fun Fact: An acre was originally defined as the amount of land a yoke of oxen could plow in one day.

Common uses: land measurement, agriculture, real estate.

Frequently Asked Questions

How many Acre are in 1 Square Kilometer?

There are exactly 247.1053814672 Acre in 1 Square Kilometer. This means the conversion factor from Square Kilometer to Acre is 247.1053814672.

What is the formula to convert Square Kilometer to Acre?

The formula to convert Square Kilometer to Acre is: ac = km² × 247.1053814672. For example, to convert 10 Square Kilometer to Acre, you would multiply 10 by 247.1053814672.

What is a Square Kilometer?