Bra Size Charts and International Conversion: US, UK, and European Sizing Explained

A bra size chart is only useful if the measurements behind it are accurate, and the numbers on it mean the same thing everywhere you shop. This guide covers the BRABAR standard for measuring, plus a full global reference chart for translating a size across US, UK, EU, French/Spanish, Italian, Australian/NZ, and Japanese sizing systems.

The BRABAR Standard

BRABAR uses the U.S. sizing system and recommends measuring your actual rib cage directly as your starting band size. Do not add 4 inches. The reference chart below helps translate sizes used internationally — because every brand fits differently, treat it as a starting point, not a guarantee of fit.

How BRABAR Measures

1. Measure your rib cage snugly, directly under the bust.
2. Round to the nearest even number — this is your band size.
3. Measure your bust at its fullest point.
4. The difference between the two measurements determines your cup size.

Unlike many traditional fitting methods, BRABAR does not add four inches to the rib cage measurement. This rib-cage-first methodology provides a more accurate starting point for modern bra fitting. For the full walkthrough, see BRABAR's rib cage measuring method.

Why European Sizing Already Matches BRABAR's Rib Cage Method

European band sizing isn't a different philosophy from BRABAR's own — it's the same one, expressed in centimeters. European sizing is built on a direct underbust measurement, with nothing added, under a regulation dating to 1975. That's the exact principle behind BRABAR's rib cage method. Converting between BRABAR sizing and European sizing is genuinely straightforward for exactly this reason — both start from the same real number. The US add-inches convention is the outlier internationally, not BRABAR's approach.

Global Bra Size Conversion & Reference Chart

This chart is a general global reference covering the full range of sizes used across major sizing systems worldwide. It is not a list of sizes BRABAR currently stocks — BRABAR's own core product range runs bands 28 to 38 and cups AA through DDD/F, shown in bold below for reference.

Band Size Conversion

Cup Size Reference

Bold rows and letters mark the portion of this chart that overlaps with BRABAR's core current product range (bands 28-38, cups AA through DDD/F).

Hard-to-Find Sizes: Where BRABAR's Stretch Styles Extend Beyond the Core Range

A few specific BRABAR styles are built with stretch-knit construction that genuinely extends beyond the core labeled range shown above — into exactly the territory this reference chart covers on both ends. This isn't true of every style, and it's worth knowing which ones flex the furthest:

• Soft Day Bra with Back Closure — Everyday Basics — the most precisely verified extended range in the lineup, confirmed for G and H cup at the 28, 30, 32, and 34 bands specifically, plus a band closer to 40 inches. Its back closure and wider strap make it a particularly strong choice at this fuller end of the range, since both features are built specifically to support more cup volume.
• Soft V Crop Bra — the widest-flexing style for the smallest sizes, comfortably reaching down to a 24 or 26-inch rib cage, alongside a sister-size equivalent up to a G or H cup on the fuller end.
• Soft Strapless Bra Top — built to comfortably accommodate a sister-size equivalent up to a G or H cup at the fuller end of its range.
• Soft Cami Bra Top — flexes to comfortably serve a sister-size equivalent up to a G cup.

Referencing the chart above, that means these specific styles reach into the 66-71cm / EU 55-60 band range on the small end, and toward the EU G-H, UK F-FF, or AU F-FF cup range on the fuller end — genuinely useful to know for anyone whose measurement falls just outside BRABAR's core labeled sizing. The labeled range is always the right starting point, and BRABAR's Fit Guide and Bra Size Calculator remains the most reliable way to confirm an exact size, but for anyone right at this edge, these specific stretch styles are the ones worth trying first.

Important Regional Notes

United States

BRABAR uses U.S. sizing. DD and E are equivalent. DDD and F are equivalent.

United Kingdom

UK sizing continues beyond D using a different lettering sequence: DD, E, F, FF, G, GG, H, HH, J, JJ, K, KK.

Europe

Most European brands use a single-letter progression: A, B, C, D, E, F, G, H, I, and so on — one letter per step, unlike the doubled letters used in UK sizing at the fuller end.

BRABAR Fit Principle

Your bra size is a starting point, not a destination. Every brand uses different patterns, materials, and cup grading. While this chart provides a comprehensive global reference, the best fit always depends on the individual garment — which is exactly why BRABAR's Fit Guide exists to confirm your accurate starting size, and why trying the specific style matters just as much as the number itself.

Common Bra Size Myths

A few persistent myths are worth clearing up directly. Cup size is not fixed — it's always relative to band size, so a 34C and a 36B represent close to the same actual volume. A tighter band isn't automatically better; it should feel snug enough to stay put without digging in or restricting breathing. And a bra size found today isn't necessarily permanent — weight changes, hormonal shifts, and simply time can all shift the accurate size, which is why re-measuring periodically matters.

How Body Changes Affect Bra Size

Bra size can shift for several genuine reasons beyond initial puberty: weight fluctuation, hormonal changes (including hormonal birth control, pregnancy, or menopause), and simply the passage of time. Re-measuring every 4 to 6 months as a general guideline, or sooner during any period of active change, keeps a size accurate rather than assumed. For teens and tweens specifically, see BRABAR's growth spurts and re-measuring guide.

Shopping With an Accurate Size

Whichever system you're converting from, the most reliable approach is measuring directly with BRABAR's Fit Guide and Bra Size Calculator, rather than relying on a size from a different brand or country as a starting assumption. Explore BRABAR's current range across the full collection.

Frequently Asked Questions

Is a US bra size the same as a UK bra size?

Band sizes are numerically identical between US and UK sizing. Cup letters mostly align through D, then diverge — a US DD/E is a UK DD, and a US DDD/F is a UK E.

How do I convert my US bra size to European sizing?

European band sizes are measured in centimeters using a different number scale (a US 34 band is roughly a EU 75). European cup letters align closely with US letters through D, then use a single-letter progression (E, F, G) where UK sizing doubles letters instead.

Does BRABAR's measuring method already align with European sizing?

Yes. Both are based on a direct underbust measurement with nothing added, unlike some US calculators that add inches, making conversion more straightforward.

What sizes does BRABAR actually carry, versus this reference chart?

BRABAR's core product range covers bands 28 to 38 and cups AA through DDD/F. A few specific stretch styles extend beyond that on both ends; the full conversion chart is provided as a general global reference.

Which BRABAR style has the most verified extended cup range?

The Soft Day Bra with Back Closure, confirmed specifically for G and H cup at the 28, 30, 32, and 34 bands, plus a band closer to 40 inches, making it a strong choice for anyone just outside the core DDD/F cup range.

Which BRABAR styles fit sizes beyond the core labeled range?

The Soft V Crop Bra reaches down to a 24-26 inch rib cage and up to a G-H cup sister-size equivalent. The Soft Day Bra with Back Closure and Soft Strapless Bra Top both reach G-H cup, while the Soft Cami reaches up to a G cup.

Does a 34C mean the same thing at every brand?

Not exactly. Sizing isn't perfectly standardized across brands or even across countries, so a 34C can vary slightly by manufacturer. Measuring directly with the rib cage method gives the most reliable starting point regardless of brand.

How often should I re-measure my bra size?

Every 4 to 6 months as a general guideline, or sooner during a period of active change like weight fluctuation, a growth spurt, or a hormonal shift.

Find your true size with BRABAR's Fit Guide and Bra Size Calculator.