Um, I think last time I measured I was 33-34 inches. I wear size 36 or 34... depends on the bra. Half the time I don't wear one. I need some more. The 36 band size I have now is on the smallest it can go, and it's still a bit loose. I find the material the band is made of and also the brand depends on what I get. I always try the bra on before I buy it. My cup size is usually B, but sometimes A, again, depending on how it's made and the brand.
I don't get or understand where ppl measure their chest and then add five -- that's way too big for me! That would be something like 38? Every 38 I've tried doesn't fit me and is way too loose.