Understanding Bra Sizes: What is the "C" in Bra Size?

A women wearing Amante Bra,

Navigating the world of bra sizes can be a confusing journey, but it’s essential for finding the perfect fit and ensuring comfort.

One common question that arises is, "What does the 'C' in bra size mean?"

In this blog, we'll explore what the "C" represents, help you determine if it’s the right cup size for you, and answer some frequently asked questions. Let’s dive in!

What is "C" in Bra Size? 

In bra sizing, the letter "C" represents a specific cup size. Bra sizes are denoted by a combination of a number and a letter, such as 34C, 36C, or 38C.

The number refers to the band size—the measurement around your ribcage just under your bust. The letter indicates the cup size, which corresponds to the volume of the breast tissue.

The "C" cup specifically means there is a 3-inch difference between the measurement around your bust at its fullest point and your band size. Cup sizes increase incrementally with each inch of difference:

  • A Cup: 1-inch difference
  • B Cup: 2-inch difference
  • C Cup: 3-inch difference
  • D Cup: 4-inch difference

Is "C" Your Perfect Cup?

Determining if "C" is your perfect cup size involves more than just understanding the difference in measurements. It’s crucial to try on different bras and styles to see what feels most comfortable and supportive. Here are a few steps to help you determine if a C cup is right for you:

  • Measure Accurately: Use a measuring tape to find your band size and bust size. Subtract the band size from the bust measurement to determine the cup size.
  • Try Different Styles: Different bra styles can affect how the cup fits. Experiment with various styles to find one that suits your body shape.
  • Check the Fit: Ensure that the cups fully encase your breasts without any spillage or gaps. The band should be snug but not tight, and the straps should stay in place without digging into your shoulders.

How Do I Calculate My Bra Size?

An infographic representing how to calculate the bra size.

Calculating your bra size involves a few simple steps:

  • Measure Your Band Size: Wrap a measuring tape snugly around your ribcage, just under your bust. Ensure the tape is level and snug but not tight. This measurement in inches is your band size. If it’s an odd number, round up to the nearest even number.

  • Measure Your Bust Size: Wrap the measuring tape around the fullest part of your bust, keeping it level. Note this measurement.
  • Calculate the Cup Size: Subtract your band size from your bust measurement. The difference determines your cup size:
  • 1-inch difference: A cup
  • 2-inch difference: B cup
  • 3-inch difference: C cup
  • 4-inch difference: D cup

For example, if your bust measurement is 37 inches and your band size is 34 inches, the difference is 3 inches, indicating a C cup. Your bra size would be 34C.


Q: How do I know if a C cup is right for me?

A: Measure your bust and band size accurately. If the difference between the two measurements is 3 inches, a C cup might be right for you. However, always try on bras to ensure the best fit.

Q: Can my bra size change over time?

A: Yes, factors like weight changes, hormonal fluctuations, pregnancy, and aging can affect your bra size. It’s a good idea to measure yourself every six months to ensure you’re wearing the correct size.

Q: Are all C cups the same across different brands?

A: No, bra sizing can vary slightly between brands. It’s important to try on bras from different manufacturers to find the best fit for you.

Q: Which is Bigger: Bra Size C or D?

A: D cup is bigger than a C cup. The difference between a C cup and a D cup is one inch. If a C cup represents a 3-inch difference between the bust and band size, a D cup represents a 4-inch difference. Therefore, a D cup has a larger volume than a C cup.


Understanding what the "C" in bra size means is an essential step towards finding the right bra for you. A well-fitted bra provides comfort, support, and confidence. Whether you’re a C cup or another size, always prioritize fit over numbers and don’t hesitate to seek professional help for measurements. Happy shopping with Amante!

Check out our other blogs:

Bra Size Calculator – Find Your Bra Size

Explained: What is Bra Sister Size with Sister Size Charts

Tips For Choosing Bras In Full Figure Sizes


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