Monday, August 4, 2014

3 Responses to Our Bra Size Calculator Explained

Last week I posted a link to our Bra Size Calculator on Facebook and it was kindly shared by quite a few people. I read some of the comments under the links and realized there are 3 consistent responses to the calculator and they are so telling about bra fitting as a whole. Here are 3 common responses and what they tell us about bra fitting:

1. "The calculator says I'm a 30H! That can't be right!"

When our calculator returns a size that is much smaller in the band than you're used to wearing or a cup letter that much higher in the alphabet it can be a shock. Considering that most stores and online boutiques fit women into bands that are too big for them so that they can sell them a size that they carry it's not surprising that many women don't know sizes like a 30H or 28GG even exist. The key thing that most people still don't know is that cup letters mean NOTHING without the band size. Lots of people still think that all F cups are enormous and all C cups are average. Georgina at Fuller Figure, Fuller Bust explains the myth of cup letters so well. She says "a cup letter without a band size is like saying it's half past without saying an hour" and she's so right. Half past 3 is quite a different time to half past 9, so too, a 30F is quite a different cup volume than a 40F (5 cup volumes different in fact).

Related Article: Not All D Cups Are The Same Size

If you're wearing a band that's too big for you but your cups 'fit' then your cup letter will be lower in the alphabet. For example, a 38DDD (or a 38F in UK sizing, which we use at Butterfly Collection) has the same cup volume as a 36FF, 34G, 32GG, 30H and a 28HH. If you measure 30 inches around your ribcage then our calculator will recommend a 30H and it looks like a big shock but in reality the cup volume is the same, only the band is more proportional to your body.

2. "This is way off for me, it says I'm a 40F and I'm a 42C."

This is rarely talked about but body fat and height make a difference to bra fit for some people. Here are some generalized correlation between body proportions and bra size:
3. "The cup size is way too big for me. It says a 36FF and I wear a 36E."

Taking two measurements can never tell you the whole story about someone's breasts. The most important things it can't tell you are the shape of your breasts or the shape of your torso. If you have a flared torso or have shallow breasts then the results of a calculator are going to be wrong. Very often if the results come back at a larger cup volume than you're wearing then your torso shape or breast shape plays a significant part in your bra size. Calculators are only ever a starting point, they are NEVER gospel, how could they be when women are so infinitely different?

There are lots of bra calculators out there and lots of them are rubbish and some of them are good (I hope ours is still on the whole good!) One thing is for sure; every single bra size calculator will be wrong for lots of women. They are one bra fitting tool that needs to be used in conjunction with other tools to arm you with the knowledge you need to understand your unique breasts and bra fit xx


  1. The bra calculator tells me that I'm a 44FF but I have tried the 40 band and found it too loose on the tightest hooks and prefer 36 and 38 bands which fit much more snug, tight but comfortable once on. If I wore the 44 band it wouldn't give me any support as it would be far too loose on me?

  2. The bra calculator was right on for me. I was wearing a 36D before using this method and never had a good fit , now wearing a 34F or 32G and they fit perfect.

  3. Well I got mine calculated correctly using instructions from this really helpful post from a lifestyle blog - How to Correctly Measure Your Bra Size with very clear and concise instructions.