Shop Bras in Size 18B – Expert Fit Meets Everyday Comfort
Understanding Bra Size 18B
Looking for bras in size 18B? You're in the right place. At The Foundation, we believe that every size deserves comfort, confidence, and style. A size 18B bra means your band size is 18 (equivalent to a 40 in UK and US sizing), and your cup size is B – indicating a moderate bust volume relative to your body shape. This size offers gentle support without overwhelming volume, making it ideal for those with a fuller frame and modest bust.
International Size Equivalents for 18B
| Region | Equivalent Size |
|---|---|
| Australia (AU) | 18B |
| United Kingdom (UK) | 40B |
| United States (US) | 40B |
| Europe (EU) | 90B |
| France (FR) | 105B |
How to Measure – Simple Sizing Guide
Getting your bust measurement right is key to comfort. Here's a quick tape measure guide:
- Step 1 – Band Size: Wrap a tape measure around your ribcage, just under the bust. Make sure it's snug and level. Round to the nearest even number – that's your band size.
- Step 2 – Bust Size: Measure around the fullest part of your bust, keeping the tape loose but level. The difference between this and your band size determines your cup size.
Not sure where to start? Try our bra fitting guide or see our full Size Chart.
Sister Sizes and Alternatives
If 18B isn’t quite hitting the mark, you might find comfort in these sister sizes:
Sister size swaps help when you're between sizes or exploring different lingerie brands.
Best Bra Styles for 18B
Here are the top styles suited for 18B:
- Lightly Padded Bras – Great for shape and comfort
- Wireless Bras / Wire-free bras – All-day ease
- Seamless T-Shirt Bras – Invisible under clothes
- Contour Bras – Defined shape with a smooth finish
- Balconette Bras – Uplift and flattering neckline
- Plunge Bras – Ideal for deep necklines
- Soft Cup Bras – No wires, total comfort
- Push-up Bras – A boost for lift and shape
- Strapless Bras – Versatile and discreet
Explore specialty styles available at The Foundation, such as the Ultimate Lift & Support Wire-Free Bra, Moisture Control Wire-Free Bra, and Seamless Wire-Free Sports Bra – each carefully selected to deliver performance, comfort, and style.
Popular Brands in Size 18B
Choose from expertly crafted pieces by:
Whether you're after a fashion bra, supportive underwire bra, or cotton-lined cups, we’ve got you covered.
The Foundation Experience
Need help with fit or style? Reach out to our customer service team or visit one of our stores. We’re proud to offer expert D-K cup bra-fitters and supportive options for every body size.
Explore by size filters and enjoy easy returns policies. Most items are machine washable and feature adjustable shoulder straps, hook fastening, and thoughtful product features like lace detailing and cotton construction. Please note that specific features may vary by brand and style—check individual product descriptions for full details.
Shop Now or explore our Shop Sale section for more great finds.
FAQs
What does size 18B mean?
It refers to an 18 band size (approx. 40 inches) and a B cup – a moderate bust volume on a fuller frame.
How do I find my exact size?
Use a tape measure and our online size calculator, or check our full size chart.
Can I return my bra if it doesn’t fit?
Yes – view our returns policies for eligibility and conditions.
What styles are best for an 18B bust?
Seamless bras, soft cups, balconette, and lightly padded styles offer both shape and comfort.
Do you offer coordinated sets?
Yes – many of our bras come with matching briefs or knickers. Check product pages for details.