Shop 12A Bra Size Collection
What Does 12A Bra Size Mean?
Let’s break it down: the number (12) is your band size, which refers to the measurement around your ribcage, just under your bust. In the Australian sizing system, this is equivalent to a UK/US 34 band. The letter (A) is your cup size, which measures the volume of your bust, and an A cup is the same across Australian, UK, and US size systems. This makes it easier to compare your size across brands globally., which refers to the measurement around your ribcage, just under your bust. The letter (A) is your cup size, which measures the volume of your bust. So, a 12A bra is made for someone with an underbust of approximately 77–82cm and a smaller bust projection. It’s a common Australian size, ideal for those with a petite or lean frame who still need proper support. Curious about how this compares internationally? Keep reading.
International Bra Size Conversion Chart
Here’s a handy size conversion chart showing how 12A lines up across global size systems:
| Region | Equivalent Size |
|---|---|
| UK | 34A |
| US | 34A |
| EU | 75A |
| FR | 90A |
Need more conversion help? Visit our size chart.
How to Measure Your Bra Size Using a Tape Measure
Use a soft measuring tape and follow these steps for an accurate fit:
- Measure Your Band Size: Wrap the tape level just under your bust. Ensure it's snug and horizontal. Round to the nearest whole number. For example, 78–82cm typically corresponds to a 12 band size.
- Measure Your Bust Size: Measure around the fullest part of your bust. Keep the tape firm but not tight.
- Calculate Cup Size: Subtract your band size from your bust measurement. A 10–12cm difference equals an A cup.
Need help finding your true bra size? While measuring at home with a tape measure is a great starting point, nothing beats the accuracy and confidence that comes with a professional fitting. Our expert team is trained to assess your unique shape, lifestyle, and preferences, ensuring your fit is both precise and personalised. Book an in-store personalised fitting—it’s the best way to get it right.
Understanding Sister Sizes
If you’re in between sizes or switching brands, try a sister size. For 12A, possible alternate sizes include:
- 10B – Tighter band, same cup volume
- 14AA – Looser band, same volume
Sister sizing helps adjust for brand differences and bra size systems.
Recommended Bra Styles for 12A
Smaller bust? No worries. You deserve comfort and shape that suits your frame. Our top picks:
- Lightly Padded Bras: Natural shape, soft finish
- Wireless Bras: All-day comfort, zero digging
- Seamless Bras: Invisible under clothing
- Balconette Bras: Subtle lift, chic design
Featured Brands Stocked in Size 12A
Explore styles in 12A from these renowned brands, like Chantelle’s soft t-shirt bras for a seamless silhouette or Marie Jo’s elegant balconettes for a touch of European flair available at The Foundation:
- Chantelle
- Calvin Klein
- Susa
- Triumph
- Marie Jo
- Prima Donna
- Berlei
- Lingadore
- Anita
- Simone Perele
Our comfortable lingerie brands bring you high-end design, everyday wearability, and premium quality.
Still Unsure About Your Size?
Whether you're new to lingerie shopping or just updating your wardrobe, our detailed size chart and fitting guide makes things easier. Your bust measurement, body size, and lifestyle all matter. If you're shifting between standard bra sizes or looking for a larger size, our guide helps you find the right fit with confidence.
Shop Now and discover bras that feel as good as they look.
FAQs
Is 12A a common bra size?
Yes, 12A is fairly common in the Australian sizing system, especially among younger women and those with petite frames.
What if my bra rides up at the back?
That usually means the band size is too loose. Consider your sister size 10B for a snugger fit.
Can I wear a push-up bra in 12A?
Absolutely. Look for light push-ups or subtle lifts that maintain natural proportions.
Should I measure myself or get fitted?
Both work. Use a tape measure at home or drop by for a personalised fitting in-store. We’re here to help!
Do different brands fit the same in 12A?
Not always. That’s why exploring sister sizing and trying a few styles can make all the difference. We offer support across sizes across brands to ensure the best fit.