About Cup Size Guide
Cup Size Guide is a free resource dedicated to helping women find their correct bra size. We build practical tools — calculators, converters, comparison charts — because we believe that accurate sizing information should be accessible to everyone, not locked behind a brand's checkout page.
Who's Behind This
Kimmay started fitting bras in 2005 at a small lingerie shop in Soho, New York City. What began as a way to pay for school turned into a two-decade career — she went on to fit at Saks Fifth Avenue and Bergdorf Goodman while working with La Perla, completing thousands of fittings across cup sizes AA to N and beyond.
She founded Cup Size Guide because she saw the same problem in every fitting room: women walking in wearing the wrong size because the information available online was outdated, confusing, or biased toward selling a specific brand. She has been featured on the Today Show, Good Morning America, The Rachael Ray Show, The Drew Barrymore Show, and in O Magazine, Women's Health, and Real Simple.
LinkedIn ProfileWhy We Built This
Fitting experts estimate that up to 80% of women wear the wrong bra size. Much of this comes from outdated fitting methods (like the +4 rule), inconsistent sizing across brands, and the sheer confusion of navigating US, UK, and EU systems. We wanted to create a single, clear place where anyone can measure themselves accurately and understand what their size actually means — across any brand, in any country.
Our Writer
Jenny is a health and wellness journalist with over a decade of experience writing about women's bodies, intimate apparel, and fit education. She has written for women's health and lifestyle publications, covering everything from sizing standards to body confidence — and became increasingly frustrated by how much bad bra sizing advice exists online, even from sources people trust.
At Cup Size Guide, Jenny writes and fact-checks all sizing content. She cross-references every recommendation against ASTM D6240 and EN 13402 standards, and stress-tests our calculator logic against fitting data from the r/ABraThatFits community and independent fitters. Her philosophy: if a sizing guide makes you more confused than when you started, it's failed.
Our Approach
Every tool on this site uses modern sizing standards. Our calculator supports both the standard 2-measurement method and the more precise 6-measurement method popularized by the bra fitting community. We show results in US, UK, EU, and AU systems simultaneously, because no one should have to guess when ordering internationally.
Every page on Cup Size Guide is written to be direct and useful. We don't pad articles to hit word counts or bury answers in walls of text. If you need to know the difference between a C and a D cup, we tell you in one sentence. If you need the full picture, our cup size guide provides it — but we never make you scroll past ten paragraphs to find it.
Our Standards
All sizing data on this site is verified against published industry standards and cross-referenced with fitting community consensus. Here's exactly what we use:
Editorial Independence
We do not accept payment from bra brands in exchange for sizing recommendations. Our calculator does not steer users toward any specific retailer. The tools work the same regardless of where you plan to shop. We have no affiliate relationships with lingerie brands.
Content on this site is reviewed quarterly for accuracy. When sizing standards change or community consensus shifts, we update our tools and articles to reflect the latest data.
Contact
Questions, corrections, or feedback? Reach us through our contact page. We take factual corrections seriously — if you spot an error in our sizing data, we'll investigate and update within 48 hours.