
Bra sizes vary across the globe, and finding the perfect-fitting bra can be a challenge. Bra sizes don't work like clothing sizes; the band size varies with the cup size, so if you go up a band size, you go down a cup size and vice versa. If you're wondering what a 34B bra size is in Australia, it corresponds to a size 12B.
| Characteristics | Values |
|---|---|
| Australian Bra Size Equivalent | 12B |
| Band Size | 34 |
| Cup Size | B |
| Sister Sizes | 10DD, 14C |
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What You'll Learn

Bra size conversion
Bra sizes can vary across different countries and brands, and even within the same brand's range of products. This makes finding the perfect-fitting bra a complicated task. However, understanding the bra size conversion can help.
Band and Cup Sizes
The first step in determining your bra size is to find your band size, which is based on your 'under bust' measurement. The second step is to determine your cup size, which is based on your 'over bust' size and how it 'fits' with your body size.
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Band and cup size
Bra sizes can vary slightly across different brands and countries. To find your correct bra size, you need to determine your band and cup size. The band size is based on your 'under bust' measurement, while the cup size is based on your 'over bust' measurement. If you go up a band size, you go down a cup size, and vice versa. This is because the cup size varies with the band size in a ratio. For example, if you wear a 12D, you could also fit into a 10DD (a smaller band size with a larger cup) or a 14C (a larger band with a smaller cup).
In Australia, a size 34B bra is equivalent to a size 12B. This means that if you usually wear a 34B bra size in another country, you would need to look for a 12B size when buying bras in Australia. However, it's important to keep in mind that sizing can vary slightly between different brands and styles, so it's always a good idea to try on the bra to ensure a proper fit.
To ensure the best fit, it is recommended to review the fitting notes provided by the brand or retailer. These notes are usually based on extensive in-store bra fittings and can help you navigate the slight variations in sizing that may occur across different brands or even within a brand's range. Additionally, taking your own bust, waist, and hip measurements can help you determine your correct band and cup size.
While finding the perfect bra size can be a challenge due to the variations in sizing across brands and countries, understanding your band and cup size is a great first step. By knowing your band and cup size, you can utilise size conversion charts and international bra size converters to navigate the differences in sizing and find your ideal fit.
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Sister sizes
Bra sister sizes are groups of bra-size equivalents that are related by cup volume. This means that if you find your perfect bra size, but the band feels too tight or too loose, you can try a sister size to get a better fit. Sister sizes are meant to keep cup volumes roughly the same, so if your band fits but the cups don't, you'll need a whole new size.
If you're wearing a 34B and the band feels too snug, a sister size up would be 36A, which offers a bit more room around the band while keeping the same cup volume. Conversely, if the band is too loose, a sister size down would be 32C, which will give you a firmer band while maintaining the same cup fit.
If you've got a 34B bra and it's too large in the cups, then a 34A may be a better fit. If the 34B is too small in the cups, then a 34C may be a better option.
It's important to note that sister sizes usually work best if you only go one step up or down from your current size. Once beyond that threshold, the bra will change its overall proportion and either be ill-fitted or not provide enough support.
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International bra size charts
Bra sizes can vary between different countries and brands, so it's important to consult international bra size charts when purchasing lingerie. These charts can help you convert your bra size from one country to another, ensuring that you find the perfect fit.
To determine your bra size, you need to know your band size and cup size. The band size is based on your 'under bust' measurement, while the cup size is based on your 'over bust' measurement. It's worth noting that bra sizes don't work exactly like clothing sizes. As the band size increases, the cup size may decrease, and vice versa. For example, if you're a 34B, you could also fit a 32C or a 36A.
It's important to note that even within the same country or region, different brands may interpret sizing differently. Therefore, it's always a good idea to review the fitting notes provided by each brand. These notes are often based on extensive in-store bra fittings and can help you navigate the slight variations in sizes across brands. By taking the time to understand your measurements and consulting international bra size charts, you can confidently shop for lingerie from anywhere in the world.
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Bra fitting services
While I wasn't able to find information on what a 34B is in Australian sizing, I did find several websites that offer conversion tables and fitting guides to help you find the right bra size for you.
Finding the right bra can be a challenge, but many companies offer fitting services to help you find your perfect fit. Brava Lingerie, for example, is Australia's only D Cup & Up lingerie specialist chain with expert bra fitters. They have fitted thousands of women with an exclusive range of D-K bras in Melbourne, Sydney, Brisbane, and online. They also offer a 30-minute wear-with-tags policy, allowing customers to try on their purchases for 30 minutes with the tags still attached, and return them if they don't fit comfortably.
She Science is another company that offers detailed fitting notes based on their 30,000+ in-store bra fittings. They emphasize that bra sizes can vary across different brands and styles, and their fitting notes help customers navigate these variations to find their ideal bra.
Some websites, like Bras N Things, offer online guides and conversion charts to help you determine your band and cup size. They recommend measuring your bust, waist, and hips to find the right size. MYER also provides a comprehensive bra fitting guide on their website, instructing customers to use a tape measure to find their over-bust and under-bust measurements, which can then be used to determine their band and cup size using a conversion chart.
These online resources and fitting services aim to make it easier for women to find their correct bra size and choose the most suitable bras for their body shape.
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Frequently asked questions
A size 34B bra is equivalent to a size 12B bra in Australian sizing.
To find your Australian bra size, you need to determine your band and cup size. First, you need to obtain your 'under bust' measurement, which will determine your body size. Then, you need to measure your 'over bust' size to determine your cup size.
Yes, bra sizes may vary slightly across different brands and even within a brand's range. It is recommended to review the fitting notes for each product to ensure the correct size.











































