Is reckon British?

English as a Second Language English Vocabulary, Grammar and Idioms
1

I remember being taught at school that ‘to reckon’ is British but I heard it said by Americans too. So how British is ‘to reckon’ really?[YSaerTTEW443543]

TOEFL listening discussions: A conversation between a professor and a university student in the professor’s office[YSaerTTEW443543]

2

To me, reckon sounds like something a small town Midwest or Southern resident would say, but among that demographic it is pretty popular.