10J Bra Size – Support, Style, and Confidence
What Does 10J Actually Mean?
The 10J bra size is a combination of a band size of 10 and a cup size of J in Australian sizing. In the Australian sizing system, the band size refers to the underbust measurement in centimetres, typically between 68–72cm for a size 10. The cup size represents the volume of the bust in relation to the band. Australian sizing differs from other systems by using even-numbered band sizes (e.g., 8, 10, 12) and lettered cup sizes, where the cup progression can vary compared to UK or US charts.
The J cup means your bust is roughly 34cm larger than your underbust measurement—so there’s generous volume to support! This is ideal for curvy women with a smaller body size who need more bust support.
This size is designed for women with a small frame and fuller bust, offering a tailored fit without compromising on comfort or style. Choosing the right bra band size and cup size means better posture, less back pain, and all-day comfort.
International Bra Size Equivalents
If you're shopping globally or comparing size charts, here’s how a 10J Australian size matches up internationally. This handy size conversion chart is a great reference:
| Region | Equivalent Size |
|---|---|
| Australia (AU) | 10J |
| United Kingdom (UK) | 32J |
| United States (US) | 32M |
| Europe (EU) | 70M |
| France (FR) | 85M |
This international bra size chart helps navigate brand-specific sizing differences, especially when dealing with cup size discrepancies.
How to Measure for the Right Fit
Getting your ideal bra size right is all about the numbers. Grab a tape measure and follow these steps:
- Measure your band size: Wrap the tape snugly under your bust (around your ribcage). Make sure it’s level and straight. Round to the nearest whole number. This gives you your bra band size—typically 10 if you're between 68–72cm.
- Measure your bust: Measure around the fullest part of your bust while wearing a non-padded bra. Again, keep the tape level to determine your bust size.
- Calculate the difference: Subtract your underbust size from your bust measurement. A difference of 34cm? That lands you in J cup territory!
Understanding Sister Sizes
If your favourite style is out of stock or you're between sizes, you might consider a sister size. These maintain cup volume but vary in band width. Also called sister sizing, they offer more flexibility in fit:
If you usually wear a 10J but need a slightly larger band size, 12H is a great sister size to consider. This is especially handy when exploring new type of bra styles or fabrics.
Best Bra Styles for 10J
With the right construction, you can feel supported, stylish, and confident. These types of bras are ideal for a 10J:
- Lightly padded: Gives shape without bulk and suits most cup types.
- Wireless: Great for comfort without compromising support.
- Full cup: Covers and supports a fuller bust beautifully.
- Seamless: Ideal for everyday wear, especially under T-shirts.
- Sports bras: Designed for high activity level, perfect for fit women needing secure support.
- Nursing bras: Available in some 10J options—look for adjustable shoulder strap types and soft fabrics.
Renowned Brands in 10J
We stock premium brands that understand fuller cup needs. For 10J sizes, explore our collection from:
- PrimaDonna – Expertly engineered for support and elegance.
- Samanta– Beautifully crafted for full-bust comfort and European style.
- Panache – Renowned for supportive structure and everyday wearability.
- Elomi – Designed specifically for fuller figures with modern comfort and flair.
These brands provide tailored solutions for a wide size range and deliver on fit, comfort, and confidence—including matching briefs and seasonal options. Availability may vary depending on style or season—including swimwear for size 10J and bikini tops suited to bikini bands and bikini styles.
Your Perfect Fit Awaits
Finding the right bra size can transform how you feel—whether it’s your first properly fitted bra or a long-overdue refresh of your lingerie drawer. At The Foundation, we’re here to support your journey with a curated selection, Expert Bra-fitting service, and personalised customer service. Whether you’re after lingerie, sleepwear, or clothing sizes to suit, we’ve got your fit covered. Refresh your lingerie drawer with pieces that feel as good as they look.
Shop Now and experience lingerie that finally feels like it was made for you.
FAQs
How do I know if 10J is the right size for me?
Use a tape measure to check your underbust size and bust. If you’re around 68–72cm underbust with a 34cm difference, 10J is likely a great fit.
What’s the difference between 10J and 12H?
They’re sister sizes—same cup volume, but 12H has a larger bra band.
Is 10J a common size?
It’s less common but absolutely valid. We cater to the majority of bra sizes, including fuller busts with smaller bands.
Which brands carry 10J at The Foundation?
Brands like PrimaDonna, Samanta and Panache frequently offer this size in select styles, including cup-size sports bras. Availability may vary depending on style and season.
Can I return bras if the size isn’t quite right?
Yes—if unworn, unwashed, and with tags on, within 30 days. Check our returns policy.