
Bra sizing in Australia is a complex process that involves taking measurements of your band (or rib cage) size and cup (or overbust) size. The band size is the firm circumference measured directly underneath the breasts, while the cup size is the difference between the rib cage and bust measurements. To calculate your band size, you should wrap a measuring tape around your torso, directly under your bust, ensuring it is snug but not too tight. For the cup size, you measure across the fullest part of your bust, usually over the nipple, with the tape measure straight across your back and parallel to the floor. These two measurements can then be used to determine your bra size using a sizing chart or calculator. It is important to note that bra sizes can vary between countries and manufacturers, so finding the perfect fit may require trying on different sizes and styles.
| Characteristics | Values |
|---|---|
| Band size | Measurement directly under the bust |
| Cup size | Difference between rib cage and bust |
| Bust size | Measurement across the fullest part of the bust |
| Frame size | Firm circumference measured underneath the breasts |
| Bra size | Double-digit number followed by one or two letters |
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What You'll Learn

Measuring underbust and overbust
To calculate your bra size in Australia, you need to measure your underbust and overbust. These measurements will help you determine your band size, cup size, and overall bra size. Here is a step-by-step guide to measuring your underbust and overbust accurately:
Preparing for Measurement:
- It is recommended to have someone assist you in taking these measurements for more accurate results.
- Stand with your arms resting by your side.
- Ensure the tape measure is straight and parallel to the floor for both underbust and overbust measurements.
- The tape measure should be held gently and comfortably for overbust measurement and firmly for underbust.
Measuring Underbust:
The underbust measurement refers to the circumference directly under your bust.
- Measure around your body, directly under the bust.
- Ensure the tape is straight all the way around and firm but comfortable.
- It is best to take this measurement without wearing a bra, or you can wear a strapless, non-padded bra. Just ensure the tape is not placed over the bra or underwire.
- This underbust measurement is used to determine your band size and back size.
Measuring Overbust:
The overbust measurement refers to the circumference around the fullest part of your bust, usually over the nipple.
- Measure across the fullest part of your bust.
- Hold the tape measure gently so that it rests lightly on your body.
- Ensure the tape is straight across your back and parallel to the floor.
- This overbust measurement, in combination with the underbust measurement, will help determine your cup size.
By following these steps, you can accurately measure your underbust and overbust to calculate your bra size using an Australian bra size calculator.
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Band and cup sizing
Bra sizing in Australia is determined by two key measurements: the band (also known as rib cage or underbust) and the cup (also known as overbust or bust). The band refers to the size of the bra band that wraps around your torso, and the cup size is the difference between the rib cage and the bust.
To measure your band size, wrap a measuring tape across your back and under your bust, where the bra band would sit. Ensure that the tape is snug, parallel to the ground, and straight all the way around. If your measurement falls between two sizes, round down to the nearest even number to find your band size.
The cup size is calculated by measuring the fullest part of your bust, usually over the nipple. Stand with your arms by your side and, if possible, have someone else take the measurement. Ensure that the tape measure is straight across your back and parallel to the floor. If your measurement falls between two sizes, round up to the nearest whole number.
It is important to note that bra sizing can vary between different countries and even manufacturers, so these measurements should be used as a guide. A well-fitted bra should feel firm but comfortable, with the breasts fully filling the cups and the band secure but not digging into the torso.
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Finding the right band size
It's important to note that band and cup sizes vary between countries and manufacturers, so your band size may differ depending on the brand. For example, a 34B bra from two different companies may not fit the same person due to this lack of standardisation. Therefore, it's a good idea to measure yourself rather than relying solely on your usual size.
There are also some signs that your band size may be incorrect, such as the band digging into your torso or sliding up, red marks, shoulder or neck pain, and the bra's centre panel not lying flat against your chest. If you experience any of these issues, you may need to adjust your band size to find a better fit.
Additionally, keep in mind that your bra size can change over time as your body shape changes due to life events such as pregnancy, breastfeeding, weight gain, or weight loss. Therefore, it's important to reassess your bra size periodically to ensure you're still wearing the correct size. By taking these steps to find the right band size, you'll be well on your way to achieving a comfortable and supportive fit.
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Calculating cup size
To calculate your bra size in Australia, you need to take two measurements: your band size (also known as underbust) and your bust size (also known as overbust). The difference between these two measurements will determine your cup size.
Band size
To find your band size, wrap a soft measuring tape across your back and under your bust, where the bra band would sit. Ensure that the tape is parallel to the ground and snug but not too tight. Take the measurement while standing up, with your arms by your side, and exhale to get the most accurate result. If your measurement falls between two sizes, round down to the nearest even number. This will be your band size.
Bust size
To find your bust size, wrap the measuring tape around the fullest part of your bust, usually over the nipple. Again, ensure that the tape is straight across your back and parallel to the floor. It should be snug but not squishing your chest. As with the band size, if your measurement falls between two sizes, round up this time.
Cup size
Now that you have your band and bust measurements, you can calculate your cup size. The difference between these two measurements will correspond to a specific cup size. For example, if your bust measurement is 10 cm larger than your band measurement, you would be a C cup. It's important to note that cup sizes are proportional to band sizes, so a C cup on a smaller band will be smaller in volume than a C cup on a larger band.
While this method provides a good estimate of your bra size, it's worth noting that bra sizes can vary between brands and manufacturers, so you may still need to try on different sizes to find the perfect fit. Additionally, breast shape and other factors such as fabric, style, and strap width can also impact the fit of a bra.
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Using a bra size calculator
Many women wear incorrectly fitted bras, and this can be due to a lack of standardisation in bra sizing. To ensure you get the right fit, you can use a bra size calculator. This will estimate your bra size based on your bust size, frame size, and common measurement standards.
To use a bra size calculator, you will need to take two measurements: your underbust and overbust. To measure your underbust, stand up straight with your arms at your sides and measure directly under your bust, where the band of the bra would sit. Ensure the tape is snug, parallel to the ground, and straight all the way around. This measurement will determine your band size.
To measure your overbust, again stand with your arms at your sides and measure across the fullest part of your bust. Ensure the tape is straight and parallel to the ground, and pull it firmly but not too tight. This measurement will determine your cup size.
Once you have these two measurements, you can input them into the bra size calculator, which will calculate your recommended bra size. It is important to remember that bra sizes can vary between countries and manufacturers, so your recommended size may not be exact. However, using a bra size calculator can help you get a better idea of the size and style of bra that will fit you best.
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Frequently asked questions
Wrap a measuring tape across your back and measure directly under your bust where the band would sit. Make sure it’s not loose but also not too tight and that the tape is parallel to the ground. If your measurement falls between two sizes, round down to the nearest even number.
With your elbows down, wrap a measuring tape around your back and measure the fullest part of your bust. Ensure the tape is straight across your back and parallel to the floor. If your measurement falls between two sizes, round up.
Some signs of an ill-fitting bra include the band digging into your torso or sliding up, red marks, shoulder or neck pain, the breasts overflowing around the edges, and the centre panel not lying flat against the breast.











































