18C Bra Size – Find Your Perfect Fit
Understanding 18C: A Perfect Fit Explained
Wearing the right bra size isn’t just about comfort—it’s about confidence. A proper 18C fit provides reliable support, shapes your silhouette beautifully, and helps you move through your day feeling secure and empowered. The 18C bra size is designed for those with a band size of 18 (measured around the ribcage, just under the bust) and a C cup, which reflects moderate bust volume. In Australian sizing, an 18C strikes a balance between firm support and a flattering silhouette, ideal for fuller figures seeking all-day comfort. This is a common cup size and fits comfortably into our bra size chart guidelines. Knowing your exact size helps eliminate digging straps, gaping cups, or discomfort.
International Size Equivalents
| Region | Equivalent Size |
|---|---|
| Australia / NZ | 18C |
| UK / US / Canada | 40C |
| EU (European Size) | 90C |
| France (FR) | 105C |
Use our international bra size converter for easy comparison across regions.
Sizing Guide: Get Measured at Home
Grab a soft tape measure and follow these steps:
- Band size: Measure snugly around your ribcage, directly under your bust. Round to the nearest even number in centimetres—that’s your back size.
- Bust size: Measure around the fullest part of your bust, ensuring the tape is straight across your back.
- Cup size: Subtract your band size from your bust measurement. A difference of 3 inches (about 7.5cm) indicates a C Cup.
Still unsure? Visit our in-store experts or explore our detailed Bra Fitting Guidelines online to get step-by-step advice and tips. You can also use our Bra Finder for personalised results tailored to your unique shape.
Sister Sizes to 18C
If you’re struggling to find your perfect fit or want alternatives, consider these sister size options. They offer the same cup volume but vary slightly in band size for a custom fit:
Best Bra Styles for 18C
Here are our top style picks for 18C bras, designed with your support and comfort in mind:
- Wirefree Bra: Think soft, stretchy support with breathable materials—ideal for all-day wear.
- T-Shirt Bra: Features seamfree construction and padded cups for a smooth, invisible silhouette under clothing.
- Sports Bra: Whether you're walking or doing high-intensity training, our Low Impact to High Impact sports bras keep you supported. Look for wide shoulder straps, moulded cups, and hook and eye back opening.
- Strapless Bra: Perfect for off-the-shoulder styles with reliable grip and a firm fit.
- Push-Up Bras: Enhance your natural shape with lift and definition—great for a special outfit or everyday boost.
- Fashion Bras: Add flair with styles that feature vintage-inspired lace or a shine floral knitted design.
Featured Brands in Size 18C
Our 18C collection features premium brands known for their fit, innovation, and style:
Support Meets Style
At The Foundation, we believe finding the right fit changes everything. Whether you're seeking a wirefree basic for everyday ease or a lace-detailed fashion piece for a night out, our 18C range offers something for every mood and moment. Explore bestsellers from brands like Berlei and Prima Donna, or find your new favourite with a quick browse. Enjoy fast delivery options and supportive returns policies.
Shop Now and embrace comfort and style today.
FAQs
How do I know if 18C is my correct bra size?
Use our tape measure method or consult our in-store fit experts.
Can I return a bra if it doesn’t fit?
Yes, as long as it's unworn and aligns with our returns policies.
Are there wirefree bras available in 18C?
Yes! We offer a range of wirefree bras in 18C, designed for day-long comfort without compromising on support. Check our collection page for current availability.
Which styles work best under T-shirts?
Go for a T-Shirt Bra with seamfree construction and light padding.
Where can I get help with fitting?
Visit our stores, contact us online, or try our Bra Finder.