12J Bra Size – Find Your Perfect Fit
What Does 12J Mean in Bra Sizes?
The Australian 12J bra size is tailored for curvy women with a smaller ribcage—specifically, a band measurement of approximately 70–74cm (equivalent to 28–29 inches)—and a full bust that needs generous cup size space. The band size "12" corresponds to this underbust range, while the cup size "J" denotes a larger bust volume. Together, they form a supportive, balanced fit for fuller busts and petite frames.
International Size Conversion
| Region | Size Equivalent |
|---|---|
| Australia (AU) | 12J |
| United Kingdom (UK) | 34J |
| United States (US) | 34M |
| Europe (EU) | 75M |
| France (FR) | 90M |
Quick Sizing Guide Using a Tape Measure
Use this easy method to confirm your size at home, following our Fit Guide:
- Band Size: Wrap a tape measure snugly around your ribcage, right under your bust. Round to the nearest whole number in centimetres. If it's around 70–74cm, you're a band size 12.
- Bust Measurement: Measure the fullest part of your bust while standing straight. Subtract your band measurement from your bust measurement. The difference in centimetres translates to your cup size.
Need help? Visit our size chart.
Common Sister Sizes for 12J
Not every bra size fits the same across brands. If 12J isn’t quite right, try these sister sizes that share a similar cup volume but different band fit:
Keep in mind: Always check the size chart for each brand before buying.
Best Bra Styles for 12J
- Lightly Padded Bras: Shape and support without bulk
- Wireless Bras: For everyday comfort and flexibility
- Seamless Bras: Invisible under clothing
- Full-Cup/ Balcony Bras: For secure support
- Sports Bras: Built for active support
- Nursing Bras: May be available in select 12J options
Brands Available in Size 12J
At The Foundation, we proudly stock premium international brands known for comfort and quality in larger cup sizes. Browse 12J options from:
- PrimaDonna – Sophisticated support with elegant lace details
- Samanta – Polish-crafted bras designed for fuller busts
- Panache – UK-based brand focused on D+ cup innovation
- Elomi– Designed to celebrate curves with confidence
Looking for something beyond lingerie? Our swimwear range is always evolving, and while 12J options may be available, we recommend filtering by size on our swimwear collection page to view the most accurate selection currently in stock.
Why Shop at The Foundation
- Expert Bra-fitting service in-store and online
- Personalised customer service tailored to your fit
- Wider size range curated for every body
- Competitive pricing across select ranges
Shop Now and discover comfort that finally fits.
FAQs
How do I know if 12J is the right bra size for me?
Measure both your underbust and bust using our tape measure guide. If your measurements align with size 12 and a J cup size difference, it's likely your best fit.
Can I find wireless bras in size 12J?
Absolutely! We offer wireless and lightly structured bras in 12J that still provide excellent support and everyday comfort.
Are returns available if it doesn’t fit?
Yes! Refer to our Orders and Returns page for full details on returns and exchanges.
Do sizes vary across brands?
Yes. While 12J is a standard bra size, fit can vary slightly between brands. Always check the individual brand’s size chart.
Where can I try these on?
Visit our store locations or get in touch with our fitting experts for a personalised customer service experience.