
Bra size calculators are a useful tool for women to determine their correct bra size. Studies have shown that between 70-85% of women wear incorrectly fitted bras, often due to a lack of standardisation in bra sizing. This tool can help women in Australia find their perfect bra size by taking into account two major measurements: the band size (torso circumference) and the bust size (circumference over the fullest part of the breasts). With these measurements, women can use the calculator to determine their band and cup size, ensuring a comfortable and well-fitting bra.
| Characteristics | Values |
|---|---|
| Purpose | To find the correct bra size for Australian women |
| Inputs | Underbust and overbust measurements |
| Method | Measure under the bust and around the fullest part of the bust |
| Notes | Measurements should be taken while standing straight with arms to the side; the tape should be straight all the way around and tight but not uncomfortable |
| Standardization issues | Band and cup sizes vary between countries and manufacturers, making it difficult to use these measures as anything more than an approximate fit |
| Fitting notes | Detailed fitting notes are provided by some brands to help customers find the right bra |
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What You'll Learn

How to measure your bust
To measure your bust, you'll need a measuring tape. Stand with your arms resting by your side and, ideally, get someone else to help take the measurements.
First, measure the band size. This is the firm circumference measured directly underneath your breasts. The tape should be straight all the way around and tight but not uncomfortable. This is how the underband of the bra will fit, so make sure the tape is right under your breasts. If your measurement is an odd number, round up to the next band size. For example, if your rib cage measurement is 32 inches (81 cm), round up to a 34 band size.
Next, measure the bust size. This is the loose circumference measured around the chest at the fullest part of the breasts. Again, stand straight with your arms to the side and wear a properly fitted bra.
The cup size can then be calculated using the difference between the bust and band size. For example, if your rib cage measurement is 31 inches and your bust measurement is 37 inches, your bra size is a 34C: 31+3=34 (band size), and 37-34=3 (cup size).
It's important to note that bra sizes and cuts can vary between countries and manufacturers. A properly fitting bra should provide comfort, support, and enhance your natural shape. The band should be snug but not tight, sitting parallel to the ground. The cups should fully encase the breasts without spillage or gaps, and the straps should stay in place without digging into the shoulders.
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How to measure your band size
To measure your band size, first, take off your bra. Then, use a measuring tape to measure around your torso directly under your bust, where a bra band would normally sit. The tape should be level and snug but not too tight. Stand with your arms resting by your side and, if possible, get someone else to help you take the measurement.
Make sure the tape is straight all the way around your body and sits right under your breasts. This measurement is your underbust. Round this measurement to the nearest whole number. For example, if you measure 32 inches, round up to 36 as your band size. If you measure 33 inches, round up to 38.
It's worth noting that bra sizes can vary between brands and manufacturers, so this measurement should be used as a guide. The band size is the firm circumference measured directly underneath the breasts. It should be fitted but not too tight.
To ensure you're wearing the correct band size, look out for the following signs of an ill-fitting bra: the band digging into your torso, red marks on your skin, shoulder or neck pain, breasts overflowing around the bra's edges, and the bra's centre panel not lying flat against your breasts.
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Signs of an ill-fitting bra
It is estimated that between 70-85% of women wear ill-fitting bras. This is often due to a lack of standardisation in bra sizing, which varies between countries and manufacturers. However, there are several signs that can help you identify if you are wearing the wrong bra size.
One of the most common issues with ill-fitting bras is the band digging into the torso or sliding upwards. This can cause red marks, discomfort, and even skin issues such as folliculitis, dermatitis, heat rash, and hives. If your bra band is too tight, it can also limit your movement and cause pain in your shoulders, neck, and upper body. On the other hand, a loose band can result in a lack of support, causing your breasts to spill out over the cups or under the bra. This can lead to friction and chafing, especially if your cups are too small or your bra has underwires.
Another sign of an ill-fitting bra is the centre panel not lying flat against your breast. This may be due to a band that is too large or cups that are too small. As a result, your breasts may be squished into your armpits or poked by the underwire, causing pain and irritation. Additionally, ill-fitting bras can cause posture problems, leading to back, neck, or shoulder pain.
To ensure a good fit, it is important to focus on the cups, front band, and straps. The band should be tight enough to stay in place without slipping but loose enough to slide a finger between it and your skin. The cups should fully contain your breasts, and the straps should be wide enough to not dig into your shoulders.
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Bra size conversion tables
Bra sizes can vary between countries and manufacturers, making it difficult to find the right fit. To help with this, bra size conversion tables can be used to translate bra sizes from one country to another. These tables are particularly useful when shopping online or when travelling to a different country.
To use a bra size conversion table, you will need to know your bust size and band size. The bust size is measured around the fullest part of the chest, while standing straight with your arms at your sides. The band size, or frame size, is measured directly underneath the breasts, fitted firmly but not tightly. With these measurements, you can refer to a bra size conversion table to find your corresponding size in another country's sizing system.
| UK | US | EUR | ASIA | AU |
|---|---|---|---|---|
| 28 C | 28 C | 60 C | 6C | - |
| 28 D | 28 D | 60 D | 6D | - |
| 28 DD | 28 DDD | 60 E | 6DD | 6E |
| 28 E | 28 DDD | 60 F | 6E | 6F |
| 28 F | 28 G | 60 G | 6FF | 6G |
| 28 FF | 28 H | 60 H | 6G | 6H |
| 28 G | 28 I | 60 I | 6GG | 6GG |
| 28 GG | 28 J | 60 J | 6H | 6J |
| 28 H | 28 K | 60 K | 6HH | 6JJ |
| 28 HH | 28 L | 60 L | 6J | 6K |
| 28 J | 28 M | 60 M | 6JJ | 6N |
| 28 JJ | 28 N | 60 N | 6K | 6O |
It is important to note that while these tables can provide a good starting point for finding the right bra size, they may not always be completely accurate. Bra sizes can vary slightly between different brands and manufacturers, so it is always a good idea to try on bras before purchasing to ensure a comfortable and well-fitting bra.
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How to use a bra size calculator
A bra size calculator can be a useful tool to determine your correct bra size. It can be challenging to find the right bra, especially with the lack of standardisation in bra sizes, which can vary between countries and manufacturers. This means a 34B bra, for example, may not fit the same person across different brands.
To use a bra size calculator, you will first need to take two measurements: your band size and your bust size. To measure your band size, use a measuring tape and measure around your torso directly under your bust, where a bra band would sit. The tape should be level, snug, but not too tight. Round this measurement to the nearest whole number.
To measure your bust size, wrap the measuring tape around the fullest part of your chest, ensuring the tape is parallel to the floor and not too loose. Stand straight with your arms to your side and wear a properly fitted bra while taking this measurement.
Once you have these two measurements, input them into the bra size calculator. The calculator will then estimate your bra size based on these measurements and the sizing standards of your selected brand or region. You can use the results as a starting point and try on different sizes and styles to find the best comfort and support for you.
It is important to note that bra size calculators are just an estimate, and the best way to ensure a perfect fit is to try on different bras and assess their feel and support.
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Frequently asked questions
The bra size calculator estimates your bra size based on your bust and band size. You can use your bust and band measurements to find your bra size using the calculator.
Studies have shown that women often choose a band that is too large and a cup that is too small. This is partly due to the lack of standardisation in bra sizing, which varies between countries and manufacturers.
To measure your bust, measure the fullest part of your chest, usually over the nipple, while wearing a properly fitted bra. For your band size, measure directly underneath your breasts, ensuring the tape is straight and tight but comfortable.
There are several online bra size calculators for Australian bra sizes, including Berlei Australia, Fine Lines Lingerie, and Bras N Things.











































