None.
A kilometre is a measure of length or distance while a football field needs to be measures in terms of its area. According to basic principles of dimensional analysis, conversion from one to the other is not valid.
A strip of land that is 12 km long and only as wide as a human hair will be far smaller than even one football field.
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12 kilometers = 13,123.36 yards (rounded)
Probably 12. (Most tracks around football fields are 440 meters = 1/4 mile).
39,370.1 feet
12,000 meters in 12 kilometers
Answer: 12 km = 7.45645 mi.