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
| US | EU | UK | FR | IT | AUS |
| 30 | 65 | 30 | 80 | 0 | 8 |
| 30AA | 65AA | 30AA | 80AA | 0AA | 8AA |
| 30A | 65A | 30A | 80A | 0A | 8A |
| 30B | 65B | 30B | 80B | 0B | 8B |
| 30C | 65C | 30C | 80C | 0C | 8C |
| 30D | 65D | 30D | 80D | 0D | 8D |
| 30DD | 65E | 30DD | 80E | 0E | 8DD |
| 30DDD (30E) | 65F | 30E | 80F | 0F | 8E |
| 30F | 65G | 30F | 80G | 0G | 8F |
| 30G | 65H | 30G | 80H | 0H | 8G |
| 30H | 65I | 30H | 80I | 0I | 8H |
| US | EU | UK | FR | IT | AUS |
| 32 | 70 | 32 | 85 | 1 | 10 |
| 32AA | 70AA | 32AA | 85AA | 1AA | 10AA |
| 32A | 70A | 32A | 85A | 1A | 10A |
| 32B | 70B | 32B | 85B | 1B | 10B |
| 32C | 70C | 32C | 85C | 1C | 10C |
| 32D | 70D | 32D | 85D | 1D | 10D |
| 32DD | 70E | 32DD | 85E | 1E | 10DD |
| 32DDD (32E) | 70F | 32E | 85F | 1F | 10E |
| 32F | 70G | 32F | 85G | 1G | 10F |
| 32G | 70H | 32G | 85H | 1H | 32G |
| 32H | 70I | 32H | 85I | 1I | 32H |
| US | EU | UK | FR | IT | AUS |
| 34 | 75 | 34 | 90 | 2 | 12 |
| 34AA | 75AA | 34AA | 90AA | 2AA | 12AA |
| 34A | 75A | 34A | 90A | 2A | 12A |
| 34B | 75B | 34B | 90B | 2B | 12B |
| 34C | 75C | 34C | 90C | 2C | 12C |
| 34D | 75D | 34D | 90D | 2D | 12D |
| 34DD | 75E | 34DD | 90E | 2E | 12DD |
| 34DDD (34E) | 75F | 34E | 90F | 2F | 12E |
| 34F | 75G | 34F | 90G | 2G | 12F |
| 34G | 75H | 34G | 90H | 2H | 12G |
| 34H | 75I | 34H | 90I | 2I | 12H |
| US | EU | UK | FR | IT | AUS |
| 36 | 80 | 36 | 95 | 3 | 14 |
| 36AA | 80AA | 36AA | 95AA | 3AA | 14AA |
| 36A | 80A | 36A | 95A | 3A | 14A |
| 36B | 80B | 36B | 95B | 3B | 14B |
| 36C | 80C | 36C | 95C | 3C | 14C |
| 36D | 80D | 36D | 95D | 3D | 14D |
| 36DD | 80E | 36DD | 95E | 3E | 14DD |
| 36DDD (36E) | 80F | 36E | 95F | 3F | 14E |
| 36F | 80G | 36F | 95G | 3G | 14F |
| 36G | 80H | 36G | 95H | 3H | 14G |
| 36H | 80I | 36H | 95I | 3I | 14H |
| US | EU | UK | FR | IT | AUS |
| 38 | 85 | 38 | 100 | 4 | 16 |
| 38AA | 85AA | 38AA | 100AA | 4AA | 16AA |
| 38A | 85A | 38A | 100A | 4A | 16A |
| 38B | 85B | 38B | 100B | 4B | 16B |
| 38C | 85C | 38C | 100C | 4C | 16C |
| 38D | 85D | 38D | 100D | 4D | 16D |
| 38DD | 85E | 38DD | 100E | 4E | 16DD |
| 38DDD (38E) | 85F | 38E | 100F | 4F | 16E |
| 38F | 85G | 38F | 100G | 4G | 16F |
| 38G | 85H | 38G | 100H | 4H | 16G |
| 38H | 85I | 38H | 100I | 4I | 16H |
| US | EU | UK | FR | IT | AUS |
| 40 | 90 | 40 | 105 | 5 | 18 |
| 40AA | 90AA | 40AA | 105AA | 5AA | 18AA |
| 40A | 90A | 40A | 105A | 5A | 18A |
| 40B | 90B | 40B | 105B | 5B | 18B |
| 40C | 90C | 40C | 105C | 5C | 18C |
| 40D | 90D | 40D | 105D | 5D | 18D |
| 40DD | 90E | 40DD | 105E | 5E | 18DD |
| 40DDD (40E) | 90F | 40E | 105F | 5F | 18E |
| 40F | 90G | 40F | 105G | 5G | 18F |
| 40G | 90H | 40G | 105H | 5H | 18G |
| 40H | 90I | 40H | 105I | 5I | 18H |
| US | EU | UK | FR | IT | AUS |
| 42 | 95 | 42 | 110 | 6 | 20 |
| 42AA | 95AA | 42AA | 110AA | 6AA | 20AA |
| 42A | 95A | 42A | 110A | 6A | 20A |
| 42B | 95B | 42B | 110B | 6B | 20B |
| 42C | 95C | 42C | 110C | 6C | 20C |
| 42D | 95D | 42D | 110D | 6D | 20D |
| 42DD | 95E | 42DD | 110E | 6E | 20DD |
| 42DDD (42E) | 95F | 42E | 110F | 6F | 20E |
| 42F | 95G | 42F | 110G | 6G | 20F |
| 42G | 95H | 42G | 110H | 6H | 22G |
| 42H | 95I | 42H | 110I | 6I | 22H |
| US | EU | UK | FR | IT | AUS |
| 44 | 100 | 44 | 115 | 8 | 22 |
| 44AA | 100AA | 44AA | 115AA | 8AA | 22AA |
| 44A | 100A | 44A | 115A | 8A | 22A |
| 44B | 100B | 44B | 115B | 8B | 22B |
| 44C | 100C | 44C | 115C | 8C | 22C |
| 44D | 100D | 44D | 115D | 8D | 22D |
| 44DD | 100E | 44DD | 115E | 8E | 22DD |
| 44DDD (44E) | 100F | 44E | 115F | 8F | 22E |
| 44F | 100G | 44F | 115G | 8G | 22F |
| 44G | 100H | 44G | 115H | 8H | 22G |
| 44H | 100I | 44H | 115I | 8I | 22H |
| US | EU | UK | FR | IT | AUS |
| 46 | 105 | 46 | 120 | 10 | 24 |
| 46AA | 105AA | 46AA | 120AA | 10AA | 24AA |
| 46A | 105A | 46A | 120A | 10A | 24A |
| 46B | 105B | 46B | 120B | 10B | 24B |
| 46C | 105C | 46C | 120C | 10C | 24C |
| 46D | 105D | 46D | 120D | 10D | 24D |
| 46DD | 105E | 46DD | 120E | 10E | 24DD |
| 46DDD (46E) | 105F | 46E | 120F | 10F | 24E |
| 46F | 105G | 46F | 120G | 10G | 24F |
| 46G | 105H | 46G | 120H | 10H | 24G |
| 46H | 105I | 46H | 120I | 10I | 24H |
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.