How many acres are in a square kilometer?

1 Square Kilometer = 247.105381467165 Acres
One square kilometre is one million square metres. (one kilometre is one thousand metres, square kilometre is 1 000 times 1 000 metres)

One acre (an old fashioned unit of area) is 4 046.9 square metres.

So 16 square kilometres is 16 000 000 square metres.

16 000 000 divided by 4 046.9 equals 3953.6 acres.