Understandable, with how many there are to pick from, and the wiggle room in the longest ones -

https://upload.wikimedia.org/wikipedia/commons/thumb/8/8b/As...

OP is talking about a football field, not a soccer field. It’s a common joke in America that things have to be measured in football terms.

In the “for what it’s worth” department, Brits called it soccer too. I have no idea why they swapped to football recently.