How Big Is a 28A Bra?

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Breasts come in many shapes and sizes, and if your breasts are on the small side, it’s easy to overlook the necessity of wearing a correctly fitting bra. In this post, I’ll learn the truth about how big a 28A bra is and how to tell if you’re wearing a properly-fitted bra.

How Big Is a 28A Bra?

A 28A bra is one of the smallest bra sizes. A 28A bra size is when the underbust (chest) measurement is 27-28 inches and the overbust (bust) measurement is 29 inches.

Graphic image of a woman wearing a blue tank top and black shorts that has a text explanation that a 28A bra size has a bust range of 28-29 inches and a band size of 27-28 inches

How Do You Measure Your Bra Size?

The majority of women wear an incorrectly sized bra. Most women wear huge bras in the back and too small in the cups. The following are some of the methods for determining your bra size at home:

Determine the Size of Your Band

To determine band size:

  1. Wrap a measuring tape around your torso exactly beneath your breast, where a bra band typically rests. The tape should be tight and level.
  2. Round up to the nearest whole number.
  3. If the number is even, add four inches; if it is an odd number, add five inches and record the result.
White non-wired bra with lace design and thin straps placed on a blue background

Measure Your Bust Size

Maintain a straight posture without a bra on and measure around your back and beneath your breast, where the bra band generally rests. Check that the tape is moving in a straight, equal line. It should be snug. Measure in inches; if you end up with an even number, that is the size of your bust.

Measure the Size of Your Cup

Take a loose measurement around your bust’s fullest area—subtracting band size from bust size. Your cup size will be determined by the difference between the two.

For petite women with really small breasts, like a 28A, I recommend having an awesome push up bra. Here’s one with serious lift – the FallSweet Add Two Cups Bras Brassiere. You’ll get some serious cleavage for a night out on the town (no joke).

What Are the Advantages of Wearing the Correct Bra Size?

Finding the ideal bra that provides the best coverage and support is difficult. Because everyone is different, there is no hard and fast rule for choosing the right bra. Here are some of the benefits of wearing a properly fitted bra:

Gray high-neck lace floral bralette placed on a pink background

Related Questions

Is the Smallest Bra Size 28A?

A 28AA bra is the smallest bra size that is widely available. This bra has a 28-inch band and a bust that is only one inch larger than the torso. When compared to how big an A cup bra size is, an AA size is smaller.

How Big Is an A Cup in Inches?

An A cup bra size means you have a 1-inch gap between your bust and band size. This exactly means that your boobs emerge from your chest only by 1 inch, resulting in a fairly small A cup size. Each bra size up implies a 1-inch increase.

What Is the Weight of an A Cup?

Boobs that fit inside an A cup weigh approximately 0.58 pounds on average. Unfortunately, the weight is only an approximation because it varies based on the quantity of breast tissue in every woman.

Bra Size Measurement & Cup Size | A, B, C, D, DD Bra Sizes AND Extra Large Breasts


A bra is one of the most vital pieces of apparel you will possess, regardless of your shape or size. A well-fitted bra provides much-needed support to assure your comfort and also helps to accentuate your natural silhouette. Every woman is unique, as are her breasts, so selecting the proper bra size is critical.


Allena is the Founder and Editor of The Better Fit, a platform dedicated to empowering women with practical advice on bras and fitness, inspired by her own revelation of the widespread issue of incorrect bra sizing. Her expertise and tips have been recognized by major publications such as Cosmopolitan, Better Homes & Gardens, Insider, and NBC, making her a trusted voice in women's wellness and lifestyle.