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Square Kilometers to Acres Converter

Convert square kilometers (km²) to acres (ac), with the formula, a conversion table and exact factors.

Change the values and press Calculate to work out your own figures.

Enter an area, choose its unit and the unit you want. The answer is exact until it is shown, and the same value appears in every other unit.

A number, fraction (3/8), mixed number (1 1/2), scientific notation (2.5e6) or a simple sum such as 2*3.
The unit you want the answer in. Swap exchanges the two units.
Result
247.105381467 ac
square miles
0.386102158542 sq mi
square yards
1,195,990.0463 sq yd
square feet
10,763,910.4167 sq ft
square inches
1,550,003,100.01 sq in
hectares
100 ha
ares
10,000 a
square meters
1,000,000 m²
square centimeters
10,000,000,000 cm²
square millimeters
1,000,000,000,000 mm²
square micrometers
1 × 10¹⁸ µm²

1 km² = 247.105381467 ac

Show the working
  1. 1 km² = 247.105381467 ac
  2. 1 × 247.105381467 = 247.105381467 ac

How to convert square kilometers to acres

1 km² = 247.105381467 ac, so multiply by 247.105381467 to go from square kilometers to acres. Going the other way, 1 ac = 0.0040468564224 km².

ac = km² × 247.105381467
km² = ac × 0.0040468564224

Worked example:

1 km² = 247.105381467 ac
5 × 247.105381467 = 1235.52690734 ac

Square Kilometers to acres table

Square KilometersAcres
1 km²247.105381467 ac
2 km²494.210762934 ac
3 km²741.316144401 ac
4 km²988.421525869 ac
5 km²1,235.52690734 ac
6 km²1,482.6322888 ac
7 km²1,729.73767027 ac
8 km²1,976.84305174 ac
9 km²2,223.9484332 ac
10 km²2,471.05381467 ac
15 km²3,706.58072201 ac
20 km²4,942.10762934 ac
25 km²6,177.63453668 ac
30 km²7,413.16144401 ac
40 km²9,884.21525869 ac
50 km²12,355.2690734 ac
75 km²18,532.90361 ac
100 km²24,710.5381467 ac
250 km²61,776.3453668 ac
500 km²123,552.690734 ac
1000 km²247,105.381467 ac

About the units

Square Kilometers (km²)
Square kilometers, a metric unit. Definition: BIPM SI Brochure (SI prefixes).

Formula version 0.1.0Reviewed