How to Measure Bra Size – Never Make Mistake Again

Do you feel lost in the space of numbers and letters every time you go out to buy a new bra? If so, and you need to find the right bra in the “bra land,” place yourself comfortably, grab a juice, because this article is going to show you how to find bra size.

Bra vs. Perfect Bra

What is a bra? It’s (shorter term of a brassiere) an undergarment that covers the breasts and ensures support to the woman while wearing it. It’s considered to be among the most complex garments that has ever made.

What is a perfect bra? The balance between desired breast looking and comfort. Research shows that almost 70% of women wear wrong bra size. Plenty of ladies would agree that’s harder to find the right size in a bra than in any other piece of garment.

Nowadays, the garment industry has made it possible for women to pick their favorite bras from a wide selection of types which meet their needs and tastes too. Finding the perfect brassiere, however, is much more than fashion. It’s about finding the correct fit, and to do so, you must determine your right bra size.

Because wearing the correct bra size isn’t just an aesthetics matte. It’s effect on your health, also. It can make headaches or neck pains, which may potentially lead to posture issues. So, if you are wearing bras that are too snug, you might even suffer from breathing disease. Even worse, it might negatively effect on lymphatic system.

Selecting the right size makes breasts look fuller, waist appearance thinner and body look taller. With a good bra, you avoid slipping, pinching or chafing on upper body. There is no almighty bra size calculator that works, but finding proper bust size begins with taking your measurements.

Size isn’t depending strictly on numbers, but also on women age, shape and lifestyle.

Wearing a too big or too small bra isn’t just uncomfortable, but unhealthy over a long term. A wrong fitted one can lead to pain in the spine, neck or head.

How to Measure for a Bra Size: Where to Start

Choosing right bra size may be difficult because bra sizing isn’t perfectly standardized. Most mainstream stores and famous bra manufacture offer limited sizes only. Generally, their band sizes differ from 32 to 38 and cup sizes from A to DD.

There are 2 main bust measurements: the cup size and band size:
The band size of bra is based on the under-chest bulk, which is positioned under your bust in the ribcage area.

In the US, band sizes are typically measured in inches, and their numerical labels (30, 32, 34, etc.) are usually analog to the ladies under bust, rounded to the nearest even number.
The cup size of bra is based on breast size, which is determined by getting the difference between under chest bulk and bust bulk. The bust bulk is measured on the highest point of breasts, and like under chest bulk, it’s typically recorded in inches by US sizing standards.

When the difference between your chest and under chest is calculated, that difference is converted to its matching alphabetical letter (A, B, C, D, etc.) in the US cup size chart.
Example 1: If your breast measurement is 36 inches and under chest is 32 inches, the difference between these two is 4 inches. The alphabetical matching of this is in a general US cup size is chart D. As a result, your recommended bra size is 32D.
Example 2: Your under-chest measurement is 29.5 inches, and you presently wear a size 32 inches band. But, the 32 inches band fits you very snugly. Avoid rounding up to 30″, and try with another size up to a 32 inches band.
Example 3: Your under-breast measurement is 34.5 inches, but you presently wear a size 34 inches band. The 36 inches band doesn’t fit snugly around the ribcage, and you can stick three fingers or more under your band. It is a better solution to size down on a 34 inches band than going up to a 36 inches band size.

How to Measure for a Bra

To precisely calculate bra size, you should take measurements of band and cup size by measuring tape. Best way to do this is while standing straight in front of a mirror. Bear in mind, that you shouldn’t wear a bra or loosen garment while taking measurements. Follow these 3 steps below on how to find bra size.

Step# 1 Band Size Measurement

While in topless, measure around the bottom of the band, directly under your chest. The measuring tape should be level and snug. Round to the first whole number, and if the number is even, add four inches. If it is odd, add 5 inches. Band size is the result of this calculation. Therefore, if you measured 30 inches, the band size is 34 inches. If you measured 31 inches, the band size is 36.

Step #2 Bust Measurement

Wrap the measuring tape around the fullest part of your bust. Ensure, that the measuring tape is at the same height in the back like in the front and parallel to the ground. Then, round to the nearest whole number.

Step #3 Calculate Cup Size

Band measurement subtracted from bust measurement give cup size result. Once you got the result, look in a size chart and determine the alphabetical equivalent of your cup size. Example: 36 inches (bust) – 32 inches = 4 inches. Cup size is a 32D. This is the best technique on how to calculate bra size.

How to Measure Bra Size without Measuring Tape

If you don’t have a measuring tape, this is one of the quickest ways on how to measure your bra size.
  • It's merely to measure bra size without a tape measure,
  • Instead of measuring tape, use some cord or string,
  • Wrap the cord around the chest, under chest line, then on the chest line,
  • Record the exact length with a pen. Determine the right dimensions with a folding ruler or straightedge.

How to Fit a Bra


The cups should seem smooth and full, without spillage. If the cups seem empty, you may need a smaller cup size. If you’re noticing spillage on the top of the cups or the sides, you need a larger cup size or bra crafted with more higher sides or cup coverage. In case, you use an underwire bra, the underwire should be flat versus bust without chafing.


The band ensures most of the support in the bra. It should fit snugly but not tightly. You should be able to squezze a finger among the bra and body. A brand-new bra should fit right in the loosest row or hooks since bra will stretched while wearing.

Over the life of the bra, you will try with the tighter hooks or rows. The band shouldn’t rise. If you notice the gaps at the cup bottom, the band is too loose, so it’s time to purchase a new bra.

Center Gore

You shouldn’t be able to stick a finger under the center gore (space between the two cups of a bra). It should lie flat vs. your bust.


Adjustable straps allow to find correct fit while the elastic in the straps loosen because of wear. Straps should sit in place without slipping or chaffing. If straps chafe or slip, you may be wearing the incorrect bra size. Bras with convertible straps will provide a better fit.

Tips on How to Determine Bra Size

  • Adjust the band. The bra back must be level with the front.
  • Correct falling straps. Tighten the band, then shorten the straps.
  • Bend forward at the waist, then put bra on and detached it. This shows that breasts are entirely in the cups.
  • How to size bra? Wear a close-fitting shirt over a bra. If your breasts bulge or cups pucker, you aren’t wearing the right size.
  • Look at yourself sideways in the mirror. Breasts should stay in the middle between shoulders and elbows. If not, you should wear more supportive and better-fitting bra.

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