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What’s the Difference Between 30C, 32C, 34C, 36C, 38C, 40C, 42C, 44C, 46C and 48C bra sizes?

Bra sizes can feel tricky to understand. Many believe that a 34C and a 40C must be the same because they share the “C cup.” But that isn’t true. Bra sizes are made up of two parts: the band size (the number) and the cup size (the letter).

This guide will explain what each C-cup size from 30C to 48C really means, how they differ, and how you can find the size that gives you the comfort and support you deserve.

Understanding Bra Size Basics: Band + Cup

Each bra size includes two essential elements that work together to ensure a proper fit. One is the band size, which supports the bust from underneath, and the other is the cup size, which reflects the volume of the breasts.

  • Band size (30, 32, 34, etc.) – This is the measurement around your ribcage, just under your bust. The band does most of the heavy lifting in a bra. Smaller numbers mean a smaller ribcage, while larger numbers mean a wider frame.
  • Cup size (C in this case) – The letter shows how far the bust projects out from the chest wall. A “C” cup is considered fuller than an A or B cup, but it doesn’t look the same across every band size.

A 30C and a 44C are both C cups, but the cup volume grows as the band grows. So, the 44C has more space in the cup compared to the 30C.

Bra Size Comparison Chart

Here’s how each C-cup size differs in fit and who it usually suits best:

Bra Size Band (inches) Cup Volume Best For
30C 25–26 Smallest C cup Petite, narrow frames with fuller bust projection
32C 27–28 Slightly fuller C Slim builds, average ribcage with moderate bust
34C 29–30 Moderate C cup Average builds needing a natural balance
36C 31–32 Fuller than 34C Broader ribcage, moderate bust
38C 33–34 Larger C volume Wider frames, plus-size women with balanced bust
40C 35–36 Wider band + deeper C cup Curvier builds needing extra support
42C 37–38 Full, round C cup Plus-size frames with fuller bust
44C 39–40 Broader, deeper C cup Fuller body types needing wide-band stability
46C 41–42 Large frame, secure C Plus-size with strong band support
48C 43–44 Broadest C cup size Extended plus-size women with fuller curves

Exploring the Most Common C Sizes

Some C-cup sizes appear more often than others. Here’s a closer look:

  • 34C Bra Size: Often seen as a “classic” C cup. Fits women with an average ribcage and naturally fuller bust. One of the most popular sizes.
  • 36C Bra Size: Has a slightly wider band and a deeper cup than 34C. Best for women with a broader chest or ribcage who still want a balanced shape.
  • 38C Bra Size: Offers more cup depth and stronger band support. A common size for plus-size women who carry more weight around the chest frame.
  • 40C Bra Size: Designed for curvier builds. The wider band provides better comfort and stability, while the C cup gives a naturally rounded look.

Let’s Talk Sister Sizes

Sometimes your regular bra size doesn’t feel quite right — maybe the band digs in, or the cups don’t sit as they should. Or perhaps your exact size isn’t available in a certain brand or style. That’s where sister sizes can help.

Sister sizes are bra sizes that share the same cup volume, but the band size and cup letter change. When you go up or down a band size, you adjust the cup in the opposite direction to keep the fit balanced.

For example:

  • If you wear a 34C, your sister sizes are 32D and 36B.
  • If the 34C feels too tight around the band, try a 36B.
  • If it feels too loose, try a 32D.

This trick is especially useful if you’re between sizes, going through body changes, or shopping different brands — since bra sizing can vary slightly.

Understanding sister sizes makes bra shopping much easier and helps you find the fit that feels both supportive and comfortable.

How to Find the Right C Cup Size

Here are some simple tips to find the right C cup size for you:

  • Measure properly – Use a soft tape to measure around your ribcage (underbust) for the band size, and around the fullest part of your bust for the cup size.
  • Don’t rely only on the label – The numbers and letters are a guide, but comfort matters most.
  • Experiment with styles – T-shirt bras create a smooth look, balconette bras add lift, and sports bras are great for active days.
  • Test the fit – Sit, stretch, and move around while trying a bra. If it slips, digs, or feels awkward, it’s not the right one.
  • Compare brands – Different brands can fit slightly differently, so it’s always worth trying more than one.

From 30C to 48C, they are all C cups, but the fit changes with the band size. A 30C is much smaller than a 48C, even though both carry the same letter “C.”

The right C cup for you is the one that feels supportive, comfortable, and makes you feel confident. Don’t hesitate to try sister sizes if your regular one doesn’t feel perfect.

At Shyaway, we offer a wide range of C-cup bras in different band sizes, so you can choose the one that truly suits your body and style.

Everyday Styles That Suit C Cups

Not every bra style works the same for every band size, even if the cup letter is the same. Here are some everyday styles that usually suit C cups across different body types:

  • T-shirt Bras – Perfect for daily wear. They create a smooth look under tops and dresses, especially for 32C–38C.
  • Balconette Bras – Great for lower or wider necklines. They add lift and give a rounded shape without too much padding.
  • Wire-Free Bras – Light and comfortable, best for 30C–34C, where support needs are lighter.
  • Minimiser Bras – A smart choice for women in 38C–44C who want a sleeker outline under fitted outfits.
  • Sports Bras – Essential for all sizes, from 30C to 48C. Larger bands (40C–48C) need wide straps and firm support for active days.
  • Full-Coverage Bras – Best for plus-size C cups (40C–48C). They stop spillage, provide stability, and keep you comfortable throughout the day.

The key is to match the bra style with your frame and outfit. While a 30C may feel at ease with bralettes or light padding, a 46C might prefer wider bands and full coverage for balance.

Every woman’s body is different, and so is every C cup. From 30C to 48C, the sizes are not one-size-fits-all—they’re shaped to adapt to different frames, bust volumes and comfort needs.

The best bra is always the one that feels supportive without effort, boosts your confidence naturally, and keeps you comfortable all day long. Whether petite or plus-size, there’s a perfect C cup waiting to flatter both your outfits and your mood.

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