18F Bra Size – Expert Fit, Everyday Comfort
What is a Size 18F Bra?
A size 18F bra combines a band size of 18 (AU) with an F cup, offering generous support for fuller busts and broader body frames. In Australian sizing, the number (18) refers to the body size under the bust, while the letter (F) represents the cup volume based on bust measurement. If you’re wearing an 18F, it means your bust measurement is roughly 6 inches more than your band measurement.
Looking for the perfect fit? Explore our expert Bra Fit Guide, packed with tips on measuring correctly, choosing the right style, and understanding how bras should fit. Or book a fitting appointment with our friendly team.
International Size Chart – 18F Bra Equivalents
| Region | Size Equivalent |
|---|---|
| Australia (AU) | 18F |
| United Kingdom (UK) | 40E |
| United States (US) | 40DDD/F |
| Europe (EU) | 90F |
| France (FR) | 105F |
How to Measure Your Bra Size with a Tape Measure
- Step 1: Measure snugly under your bust to find your band size.
- Step 2: Measure around the fullest part of your bust without squashing the breast tissue.
- Step 3: Subtract the band measurement from the bust measurement. The difference in inches gives you your cup size.
Use a tape measure and refer to our detailed Bra Fit Guide to discover your ideal size. We also offer virtual bra fitting services for your convenience.
Sister Sizes & Fit Alternatives
If you’re struggling with tightness or gaping, sister sizes can help. For an 18F, consider:
Every lingerie brand fits a little differently, so trying a few can help achieve your perfect fit.
Best Bra Styles for Size 18F
- Lightly Padded Bras – for subtle shaping and everyday support.
- Wireless Bras – perfect for comfort without compromising lift.
- Seamless Bras – ideal for a smooth silhouette under clothing.
- Full Cup Plunge Bra – combines support with a flattering neckline.
- Full Cup Control Bra – maximum support for daily wear.
- Sports Bras – like the Triaction Performance Sports Bra for active days.
- Strapless Bras – reliable options with side panels for special outfits.
- Maternity and Nursing Bras – such as the Gorgeous Mama Lace Wirefree Bra for new mums.
Look for breathable linings and full cup designs that give you lift, shape, and comfort all day long.
Brands That Stock Size 18F
We proudly stock 18F bras from some of the world’s leading lingerie brands:
Find Your Perfect Fit
Feeling supported isn’t just about your bra – it’s about how it makes you feel. At The Foundation, we believe confidence starts beneath the surface. That’s why we curate bras that embrace your natural shape, elevate your comfort, and empower you to move through the world with ease.
Our curated range of 18F bras is designed for comfort, confidence, and everyday wearability. Whether you're after something seamless, supportive, or stylish, you'll find it here. Don’t forget to check out our Best Selling styles and special offers.
We ship Australia-wide with a tracked service and offer Easy returns—you can return full-priced bras within 30 days for a refund or exchange, as long as they're unworn with tags attached.
Shop Now and experience the difference a well-fitted bra makes.
FAQs
How do I know if 18F is my correct bra size?
Use a tape measure, try our bra finder quiz, or book a virtual fitting.
What if I’m between sizes?
Try a sister size like 16FF or 20E for a better fit.
Can I return a bra if it doesn’t fit?
Yes, see our returns policy for full details on our Easy returns process.
Are wireless bras supportive enough for size 18F?
Absolutely – look for styles like the Kiss of Cotton Wirefree Bra for support and comfort.
What’s the best bra for everyday comfort in size 18F?
The Gorgeous T-Shirt Bra is one of the fantastic options.
Need more help? Contact our expert team or visit our privacy policy and terms & conditions for more info.