An American football field is 120 yards long by 53 1/3 yards wide. == ==
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100 by 50 yards (if you mean soccer) but there is some flexibility in the rules.
NFL
length: 360 feet(120 yards)
width: 160 feet(53 1/3 yards)
end zone: 10 yards deep
If you're talking about American football, 100 yards. If you're talking about soccer, well, I don't know.