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bra sizes

We all have moments when we struggle with bra sizing while online shopping. Bra sizing can be at times both confusing and stressful, especially when we’re trying to figure out sister sizing and converting our bra sizes. Recently, we spoke about bra sister sizing and included an easy to use bra sister size conversion chart. Our chart uses UK sizing to help you determine your sister size in another UK sized brand.

While UK bra sizing is utilized by most full figured lingerie brands (like Parfait, Panache, Goddess, Fantasie), brands with products that use US bra sizing (like Wacoal, Natori, Felina, Blush) also cater to larger cup and band bra sizes. No matter where you’re buying your bras (whether it’s online or at a specialty store), it’s important to know how to convert your bra cup size from US to UK sizing.

What is one of the most important differences between UK and US sizing?

Many of us might not know that there are differences between US and UK sizing. For example, did you know that a US 36DDDD/G bra is equivalent to a UK 36F? When UK bra sizes get bigger, the cup sizing starts to look different.

A typical UK bra size chart looks something like this:

UK bra sizing can include cup sizes AA, A, B, C, D, DD, E, F, FF, G, GG, H, HH, J, JJ, K…

UK Bra Size Chart

A typical US bra size chart looks something like this:

US bra sizing can include cup sizes AA, B, C, D, DD/E, DDD/F, DDDD/G, H, I, J, K, L, M, N, O…

US Bra Size Chart


Related: Bra Sizing Explained: Here’s How Bra Sizing Works


Converting Your Bra Size From US to UK Sizing

Size conversions are challenging when you’re shopping for DD+ bras. While most brands that use UK sizing produce bra sizes up to a K cup, the majority of lingerie brands in US sizing typically start at an A cup and stop at a DDDD/G cup. Some brands, like Wacoal, go up to a DDDDD/H cup. Converting these sizes into the US size equivalent can be a nightmare if done incorrectly.

Wondering why many lingerie brands that use UK sizing go to up to a K cup and most lingerie brands that use US sizing only go up to a G or H cup (the equivalent of a UK F or FF cup)? It’s not because of a lack of demand. Many UK brands start their sizing in a 26 or 28 band and go up to a 42 or 44 band. Since each new size adds an additional cost for the brand (cost of the pattern, cost to produce the bra, etc), most brands stop at a G or H cup and either slowly add additional sizes (always worth it to come back to a brand you like to see if they’ve increased their size range) or stick with the sizes they have if it’s too expensive for them to expand.

Brands that sell bras in UK sizing typically offer FF, GG, HH, and JJ cup size options. Don’t let the letters fool you – though they use a different lettering system, the cup size equivalent is essentially the same (example: UK K cup and US O cup have the same cup volume).

No matter which brand you’re shopping, bra size conversions can be difficult and confusing. To make conversions easier, we’ve created a simple bra size conversion chart for converting US bra sizes into UK bra sizes or UK bra sizes into US bra sizes.

Ready to begin? Here’s our bra size conversion chart:

us to uk bra size conversion chart

We hope this chart helps you easily convert your bra size into US or UK sizing. Happy bra shopping!


Related: Find Your Bra Sister Size With Our Simple Chart


We Highly Recommend

Whether you’re shopping for new everyday bras or lingerie for a special occasion, it’s always a good idea to seek out a second opinion. We know how hard it is to find bras that fit well and feel good, especially when you’re doing it on your own. If you’ve ever felt unsure about your bra size or you just don’t know where to go to find good bras, it’s time to let a bra fitter help.

Many specialty lingerie boutiques offer bra fittings. Their expert bra fitters will take the pain and frustration out of bra shopping and do all the work for you. Even better, their product knowledge can save you time and money. Plus, they know where all of the best bras are hiding.

If you’ve struggled with finding bras in the right size, it’s time to make a change. Visit our specialty store locator to find a store near you and schedule an appointment.

Happy bra shopping!


Featured image lingerie:
Parfait Ellie Unlined Wire Bra P5082 | Parfait Ellie Hipster P5085 in Pewter/Nude

Published by

Katie Donnelly

Katie Donnelly is a full-time freelance writer, content manager, and founder of Katie Rose Creative. An experienced bra fitter, Katie has helped hundreds of people shop for lingerie. Her favorite bra is the Sandrine Plunge Longline Bra.

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