What is my bra size? 😅

My band around ribcage measurement is 28 inch and around breast is 34 inch. I looked on online calculator and it keeps giving me something crazy like 28 F. But I know I am not f cup and it is not practical since many places (in US at least) carry 30-38 aa-dd. I never have worn cup bras before only sports bras and bralettes in small medium or large depending on the brand so this does not help much to determine it. Anyone know? Thanks.