10K Bra Size – Find Your Perfect Fit
Understanding the 10K Bra Size
The 10K bra size is designed for curvy women with a larger bust and smaller band size. In Australian sizing, the "10" refers to your band size—fitting a body that measures around 70cm under the bust. The "K" represents a full cup size designed to comfortably support larger busts and dense breast tissue.
Wearing the correct bra size isn’t just about comfort. It’s also essential for maintaining good posture, ensuring support during intense activities, and protecting your overall breast health. A well-fitting 10K bra supports your everyday life and workout routine, from daily wear to high-impact activities like netball, horse riding, and gym training. It also helps reduce breast movement and long-term strain on the body.
International Size Chart
Here's how the 10K bra size translates internationally:
| Region | Size Equivalent |
|---|---|
| Australia (AU) | 10K |
| United Kingdom (UK) | 32K |
| United States (US) | 32O |
| Europe (EU) | 70P |
| France (FR) | 85P |
Check out our full Size Chart for detailed guidance, and consider bookmarking it for easy access whenever you need sizing support.
How to Measure – A Quick Guide
To measure your bra size accurately, grab a soft tape measure:
- Band Size: Measure around your ribcage, just under the bust. If you measure around 70cm, you're likely a size 10 band. This is your calculated band size.
- Bust Measurement: Measure around the fullest part of your bust to determine the correct cup size.
- Cup Size: Subtract your band size from the bust measurement. A difference of 25cm or more may indicate a K cup.
Refer to our detailed Bra Fitting Guide for visual steps and extra tips.
Sister Sizes and Alternatives
Can’t find your favourite 10K style? Sister sizes provide the same cup volume with a slightly different band:
- 8L (smaller band)
- 12J (larger band)
Sister sizes are also a great fit option if you're adjusting for comfort preferences or browsing our entire bra range.
Best Bra Styles for 10K Cups
Fuller busts require exceptional support, especially for active lifestyles. Our top recommended styles include:
- Lightly Padded Bras – Soft shaping without adding bulk, perfect for everyday wear.
- Wirefree Bras – Designed for comfort without underwire; great for moderate-intensity movement.
- Seamless Bras – Invisible under clothing, ideal for daily wear.
- Full Cup Bras – Offer extra coverage and maximum support.
- Balconette Bras – Flattering lift with wide straps for added comfort.
- Wirefree Sports Bras – For active women who need flexibility and support.
- Non-Padded Sports Bras – Lightweight and breathable for high-intensity workouts.
Featured Brands Available in Size 10K
At The Foundation, we proudly carry inclusive, premium lingerie brands that cater to fuller bust needs:
- Elomi – Designed specifically for fuller figures with modern comfort and flair.
- Samanta – European-crafted bras offering tailored support and comfort for curvy women.
Whether you’re after a comfortable sports bra, something with wide or gel-cushioned straps, or stylish fuller bust lingerie—you’ll find it here, especially with trusted brands like Elomi and Samanta leading the way.
Active & Sports Options in 10K
- Plus-Size Sports Bras for long-term, extended wear
- Non-Padded Sports Bras for breathability during intense workouts
- High-Quality, High-Impact Sports Bras for AFL, cricket, netball, and more
- Dance Sports Bras and Teenage Sports Bras for targeted support
- All-Day Sports Bras to keep you comfortable from morning to night
- Wirefree Sports Bras for lightweight flexibility
- Horse Riding Sports Bras and Basketball Sports Bras for movement control
We support women across Australia with bras made for everything from high-impact workouts to everyday comfort. For example, the Elomi Energise Sports Bra is a popular choice—offering wirefree structure, wide straps, and bounce-reducing support perfect for gym workouts or weekend errands alike. Designed to minimise breast movement and maximise performance.
Ready to Find Your Fit?
Our expertly curated 10K bra collection is made for women who want style, structure, and true support—backed by years of bra-fitting experience and excellent customer reviews that reflect our dedication to fit and comfort. Whether you’re hitting the gym, heading to work, or chasing after the kids — we’ve got your fit.
Shop Now and feel the difference a truly supportive bra can make.
Frequently Asked Questions
How do I know if I’m really a 10K?
Use a tape measure to check your band and bust size. If your underbust measures around 70cm and your bust is 25cm+ larger, you’re likely a 10K.
Are 10K bras hard to find?
Not at The Foundation! We stock a wide variety of fuller bust bras, including quality sports bras and plus-size options across a range of styles.
Can I wear wirefree or sports bras in 10K?
Definitely. We offer wirefree sports bras, non-padded styles, and high-impact bras designed for larger busts.
What if I’m between sizes?
Try a sister size like 8L or 12J. Look for adjustable straps and flexible designs that offer a custom fit.
Do you offer sports bras with extra coverage for active women?
Yes! From horse riding and soccer to gym sessions and field sports, our collection includes sports bras with extra coverage and excellent support.