20J
20J Bra Size
Understanding the 20J Bra Size
Finding a bra that fits just right starts with understanding your size — and the 20J is a beautifully supportive option designed for fuller busts and broader backs. In Australian bra sizing, the "20" represents the band size (measured around your ribcage), while the "J" reflects the cup volume. This size falls under our D–K cup range, crafted for those who need both width and depth in their support. At The Foundation, we’re experts in bra fitting, ensuring that your 20J bras offer a perfect balance of comfort and shape — without compromise.
International Size Equivalents
| Region | Size Equivalent |
|---|---|
| Australia (AU) | 20J |
| UK | 42GG |
| USA | 42J |
| EU | 95M |
| France (FR) | 110M |
How to Measure Your Bra Size
Using a tape measure at home is simple and can help you double-check if you're wearing the right fit.
- Band Size: Measure snugly around your ribcage, just under the bust. Round to the nearest whole number in centimetres. If it's even, add 4cm; if it's odd, add 5cm.
- Bust Measurement: Measure around the fullest part of your bust. Keep the tape straight and comfortable, not tight.
- Find the Cup: Subtract the band size from the bust measurement. Each 2.5cm difference is roughly one cup size.
What Are Sister Sizes?
If 20J feels slightly off, try exploring sister sizes — these are alternative sizes with the same cup volume but a different band fit.
Whether you're shopping for maternity and nursing bras or everyday comfort, the right sister size could be the key to finding your perfect bra.
Best Bra Styles for 20J
Supportive, stylish and size-inclusive — these are our top picks for 20J bras:
- Wirefree styles: All-day comfort without compromising support
- Lightly padded: Subtle shaping that flatters naturally
- Full coverage: Secure support with higher-cut cups and C-shaped wires for forward lift
- Sports bras: Ideal for low impact, medium impact, and high impact activity levels
- Strapless bras: For those trickier outfits — yes, even in 20J!
- Lace bras: Elegant, supportive, and made for the fuller bust
Looking for a complete set? Explore our plus size lingerie sets for coordinated style and fit.
Featured Brands in 20J
Need Help?
From our virtual fittings to in-store fitting appointments, we’re here to make your experience easy. Reach out via our Contact Us page, or drop by any of our stores.
Find Your Fit Today
Explore our collection of 20J bras designed for shape, support and confidence. Want help choosing the right style? Check out our guide to How to Choose a Bra for a Fuller Bust. Whether you're after everyday comfort, nursing bras or fuller bust lingerie, we've got your back — literally. Your perfect bra is just a few clicks away.
FAQs
What does 20J mean in bra sizes?
"20" refers to the band size, while "J" is the cup volume — together, they suit a fuller bust on a broader frame.
Do you have sports bras in 20J?
Yes! We stock sports bras suitable for various impact levels, designed to keep you supported and secure.
What if I’m between sizes?
Try a sister size, like 18K or 22H, or book a virtual fitting for help from our expert team.
Can I find lace or strapless bras in this size?
Absolutely! Our lace bras and strapless styles are available in selected 20J designs.
How does your returns process work?
We offer Free Exchanges and a relaxed policy. Read about our returns process for full details.