US Bra Conversion Size Chart: Your Ultimate Guide to International Sizing

Buying bras internationally can be confusing, especially when countries use different sizing systems. As online shopping grows and travel becomes easier, understanding bra size conversions is more important than ever. This guide helps you navigate sizing differences, but choosing the right chart involves tradeoffs between precision, brand consistency, and comfort.

US Bra Conversion Size Chart

USEUUKFRITAUS
3065308008
30AA65AA30AA80AA0AA8AA
30A65A30A80A0A8A
30B65B30B80B0B8B
30C65C30C80C0C8C
30D65D30D80D0D8D
30DD65E30DD80E0E8DD
30DDD
(30E)
65F30E80F0F8E
30F65G30F80G0G8F
30G65H30G80H0H8G
30H65I30H80I0I8H
USEUUKFRITAUS
32703285110
32AA70AA32AA85AA1AA10AA
32A70A32A85A1A10A
32B70B32B85B1B10B
32C70C32C85C1C10C
32D70D32D85D1D10D
32DD70E32DD85E1E10DD
32DDD
(32E)
70F32E85F1F10E
32F70G32F85G1G10F
32G70H32G85H1H32G
32H70I32H85I1I32H
USEUUKFRITAUS
34753490212
34AA75AA34AA90AA2AA12AA
34A75A34A90A2A12A
34B75B34B90B2B12B
34C75C34C90C2C12C
34D75D34D90D2D12D
34DD75E34DD90E2E12DD
34DDD
(34E)
75F34E90F2F12E
34F75G34F90G2G12F
34G75H34G90H2H12G
34H75I34H90I2I12H
USEUUKFRITAUS
36803695314
36AA80AA36AA95AA3AA14AA
36A80A36A95A3A14A
36B80B36B95B3B14B
36C80C36C95C3C14C
36D80D36D95D3D14D
36DD80E36DD95E3E14DD
36DDD
(36E)
80F36E95F3F14E
36F80G36F95G3G14F
36G80H36G95H3H14G
36H80I36H95I3I14H
USEUUKFRITAUS
388538100416
38AA85AA38AA100AA4AA16AA
38A85A38A100A4A16A
38B85B38B100B4B16B
38C85C38C100C4C16C
38D85D38D100D4D16D
38DD85E38DD100E4E16DD
38DDD
(38E)
85F38E100F4F16E
38F85G38F100G4G16F
38G85H38G100H4H16G
38H85I38H100I4I16H
USEUUKFRITAUS
409040105518
40AA90AA40AA105AA5AA18AA
40A90A40A105A5A18A
40B90B40B105B5B18B
40C90C40C105C5C18C
40D90D40D105D5D18D
40DD90E40DD105E5E18DD
40DDD
(40E)
90F40E105F5F18E
40F90G40F105G5G18F
40G90H40G105H5H18G
40H90I40H105I5I18H
USEUUKFRITAUS
429542110620
42AA95AA42AA110AA6AA20AA
42A95A42A110A6A20A
42B95B42B110B6B20B
42C95C42C110C6C20C
42D95D42D110D6D20D
42DD95E42DD110E6E20DD
42DDD
(42E)
95F42E110F6F20E
42F95G42F110G6G20F
42G95H42G110H6H22G
42H95I42H110I6I22H
USEUUKFRITAUS
4410044115822
44AA100AA44AA115AA8AA22AA
44A100A44A115A8A22A
44B100B44B115B8B22B
44C100C44C115C8C22C
44D100D44D115D8D22D
44DD100E44DD115E8E22DD
44DDD
(44E)
100F44E115F8F22E
44F100G44F115G8G22F
44G100H44G115H8H22G
44H100I44H115I8I22H
USEUUKFRITAUS
46105461201024
46AA105AA46AA120AA10AA24AA
46A105A46A120A10A24A
46B105B46B120B10B24B
46C105C46C120C10C24C
46D105D46D120D10D24D
46DD105E46DD120E10E24DD
46DDD
(46E)
105F46E120F10F24E
46F105G46F120G10G24F
46G105H46G120H10H24G
46H105I46H120I10I24H

Why Bra Sizes Vary Between Countries

While the goal of bra sizing is the same worldwide—to ensure a comfortable and supportive fit—the systems used can vary significantly. Different regions, such as the US, UK, EU, AU, and Japan, have developed unique sizing methods based on their own measuring standards and consumer preferences.

For example, the US uses inch-based measurements, while the EU relies on centimeters, leading to differences in how band sizes are calculated. Additionally, cup sizes don’t scale the same way across systems—what’s a DD in the US might be labeled an E in the UK.

These discrepancies stem from both historical garment industry practices and cultural norms around fit and body shape. As a result, choosing a size across systems involves tradeoffs between accuracy, brand reliability, and personal comfort.

Some charts aim for simplicity but sacrifice precision, while others offer detailed conversions that may confuse consumers. When relying on a US Bra Conversion Size Chart, it’s crucial to understand these underlying variations. Doing so helps minimize returns, enhances fit, and empowers buyers to make better decisions across brands and borders.

US Bra Sizing Basics

Before you can convert sizes accurately, it’s important to understand how US bra sizing works. The system relies on two key measurements: band size and cup size. Band size is measured around the ribcage, just under the bust, and typically rounded to the nearest even number.

Cup size is calculated by the difference in inches between the bust and band measurements—each inch of difference equals one cup size (A, B, C, etc.). For example, a 34C means a 34-inch band and a 3-inch difference between the bust and band.

Despite its simplicity, this approach presents challenges. Many consumers assume cup size alone indicates volume, overlooking that it’s relative to band size—a D cup in a 32 band is smaller than a D in a 38 band.

Additionally, inconsistencies across brands complicate sizing. When using a US Bra Conversion Size Chart, it’s essential to consider these nuances to avoid poor fit, discomfort, or unnecessary returns.

US to UK Bra Size Conversion Chart

The UK uses a similar system to the US, but there are crucial differences in cup sizing beyond a D cup. Both countries measure band sizes in inches, so converting bands is relatively straightforward—32 in the US is generally a 32 in the UK.

However, the major distinction lies in the cup sizing structure. While the US moves from D to DD and then DDD (or E), the UK goes from D to DD, then E, F, FF, and so on, introducing double letters more frequently.

This variation can create confusion, especially for those shopping online or across brands. For instance, a US DDD is not equal to a UK E, which often leads to inaccurate size selection.

Below is a quick reference chart to simplify the process. When relying on a US Bra Conversion Size Chart, it’s vital to account for these structural differences to ensure a proper fit and avoid discomfort or returns.

US to European (EU) Bra Size Conversion Chart

European sizing differs significantly from US sizing, particularly in the way band sizes are measured. EU bands use centimeters, not inches, typically referring to the under-bust measurement directly. For example, a US 34 band is roughly an EU 75.

While cup letters appear similar, sizing progression and volume can differ, especially beyond a D cup. This can lead to challenges when converting sizes, as a simple letter match doesn’t always guarantee an identical fit.
Therefore, relying solely on labels can be misleading. A precise US Bra Conversion Size Chart must consider these differences to minimize fitting errors and enhance comfort.

US to Australian (AU) Bra Size Conversion Chart

Australian bra sizes can be easily confused with UK sizes, but subtle variations make it essential to consult a proper chart. While band sizes often align, cup labeling can differ slightly, especially in larger sizes.

This overlap creates the illusion of compatibility, yet inconsistencies across brands introduce fitting challenges. Therefore, blindly assuming sizes are interchangeable can lead to poor support and discomfort. A well-designed US Bra Conversion Size Chart must factor in these nuances to help wearers achieve both accuracy and comfort.

International Bra Size Conversion Chart (All-in-One)

To simplify your shopping experience, here’s a comprehensive chart comparing US, UK, EU, AU, and JP sizes. Although international conversions can streamline cross-border purchases, interpreting them correctly requires caution.


Band sizes and cup volumes don’t always match perfectly, even if labels appear similar. Therefore, use the chart as a starting point, not a guarantee. When shopping online, always check brand-specific guides and reviews.

A reliable US Bra Conversion Size Chart should balance simplicity with accuracy to reduce sizing errors and improve overall fit.

Tips for Getting the Best Fit When Shopping Internationally

Even with a conversion chart, there are a few tricks to ensure you find a bra that truly fits. First, always refer to brand-specific size guides, as sizing can vary widely. Additionally, try on multiple sizes whenever possible to account for these differences.

Moreover, knowing your exact measurements in both inches and centimeters helps navigate international sizing more accurately. Balancing these factors can be challenging, but doing so minimizes returns and discomfort, making a US Bra Conversion Size Chart a helpful, though not infallible, tool.

Conclusion

Understanding bra size conversions can save you frustration and ensure a comfortable fit wherever you shop. Accurate conversions are essential, so use this guide and chart as reliable tools. However, for the best results, consider a professional fitting before buying internationally to balance fit, comfort, and sizing variations.

FAQs

Why do bra sizes differ between countries?
Bra sizes differ because countries use various measurement systems and sizing standards. For example, the US uses inches while Europe uses centimeters, and cup sizes scale differently. These variations stem from historical, cultural, and manufacturing differences, which can make international sizing confusing without a proper conversion chart.

Can I rely solely on a bra size conversion chart when buying bras online?
While conversion charts provide a helpful starting point, they aren’t foolproof. Brand sizing can vary, and fit depends on individual body shape. It’s best to combine charts with brand-specific guides, customer reviews, and, if possible, professional fittings for the most accurate results.

What is “sister sizing” in bra fitting?
Sister sizing refers to the relationship between band and cup sizes that hold the same cup volume but differ in band length. For example, a 34C and a 32D have similar cup volumes but different band sizes. Understanding this concept helps when exact sizes aren’t available.