How to Measure Your Bra Size

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How to Measure Your Bra Size

Wearing an ill-fitting bra is uncomfortable, unflattering, and unhealthy. A bra that pinches, underwires that poke into the breasts or underarms, straps that fall off or cut into the shoulders, or a band that rides up is irritating to say the least. Breasts that look saggy and defeated, bulge over the cups to form two extra breasts, or are pushed together to form a uniboob are not doing you justice. Bras that are too loose or too tight can even cause back pain, skin irritation, breast pain, and stretch marks. All of these things can be avoided by measuring your bra size to find the right bra for you.

You should measure your bra size at least once a year, during and after pregnancy or any other hormonal changes, and after weight changes. Measuring your bra size is slightly more complicated than measuring for clothing. However, with the help of this guide, you can measure your bra size to find the best fit for you. Learn how to measure for the band and cup size, and how to use these measurements to calculate your bra size. A list of what to look for to determine whether the bra that you have chosen fits properly is included. Bras are available from lingerie, department, and clothing stores, and from online sources, such as eBay.

How to Measure Your Band and Bust Sizes

You need two measurements to calculate your bra size: band and cup. Use a tailor’s tape measure to take these measurements. Keep the tape parallel to the floor, do not pull it tight, and measure against the skin for the most accurate results. UK bra sizes are calculated in inches, so it is best to take the measurement in inches or to convert metric measurements to imperial units.

How to Measure Your Bra Band Size

To obtain your band measurement, expel all the air from your lungs while you measure. Run the tape around your torso, directly under your bra. Round off all fractions to the nearest whole number. Remember that fractions under a half are rounded down, while fractions of a half or more are rounded up. For example, 32.4 is rounded down to 32, while 32.5 is rounded up to 33. Use the table below to find your band size.

Measurement (in)














Band Size














Band sizes over 38 are equal to the whole even number closest to the bra band measurement. For example, a measurement of 43 inches equates to a 44 band size.

How to Measure Your Bust Size

Bust size can be measured while you are wearing a bra, provided the bra is not padded. You may need to ask a friend or family member for help. This measurement should be taken while you stand up straight with your arms at your sides. Measure across the fullest part of your bust. Do not pull the tape measure tight and keep it parallel to the floor. Round the measurement to the nearest whole number.

How to Calculate Your Bra Size

To calculate your bra cup size, subtract your band size from your bust measurement. For example, if your band size measurement is 30 inches, then your band measurement is 32 from the table above. So, if your bust measurement is 34 inches, then your bra cup size is equal to 34 minus 32, which is equal to 2. Use this number and the table below to find your corresponding alphabetical cup size. In this case, the cup size would be B. Therefore, the bra size would be a 32B.

Difference Between Bust Size and Band Size Measurements (Inches)

Cup Size

0 to 0.5


0.5 to 1









DD or E


DDD or F









This method becomes less accurate after a D cup or a four inch difference and probably will not be accurate for droopy breasts. In addition, larger sizes have different size indicators across brands. If necessary, experienced sellers should be able to guide you about larger sizes across brands. As with clothing in general, some brands will fit better than others due to differences in cut and construction methods.

How to Spot a Perfect Fit when Trying on Bras

There are a number of finer points about a bra’s fit that will tell you if it is the right size for you. Generally, the bra should not be uncomfortable and should not pinch. Components such as centre panels should lie flat against the skin.

The Bra’s Cups are a Perfect Fit

Your breasts should fill the cups without spilling over the edges or leaving baggy sections. If your breasts are too big for the cup, choose a larger cup size without increasing the band size. If your breasts do not quite fill the cups, choose a smaller cup size. Most women have one breast slightly bigger than the other. However, in some women this size difference can be up to a full cup size. Choose a bra that fits the larger breast and add padding to the emptier cup if needed.

The cup fabric should shape and support the breast. Even if you like the look of a bra, try it on with a blouse or T-shirt before you make up your mind. It should separate, lift, and support your breasts and improve your silhouette. The lift supplied by a good bra has a slimming effect and makes the wearer look younger. The top of the breasts should be halfway between the shoulder and the elbow. Finally, breasts should face the front without spilling out of the cups under the arms. You should be able to swing your arms freely while wearing the bra.

The Bra’s Centre Panel Lies Flat Against the Breastbone

Minimisers are the only bras that fit even when the centre panel does not lie against the breastbone. If the centre panel is positioned away from the breastbone in other bra types, it could mean that the cup size is too small or the panel is too small to effectively accommodate the separation between the breasts. Larger breasts have less space between them and this should be taken into account when choosing a bra.

The Bra’s Band Fits Comfortably

The majority of a bra’s support comes from the band, not the straps. The band should not ride up at the back and should sit level or slightly lower at the back than at the front. The band should be snug, not tight. You should be able to fit two fingers under it at the back and run a finger under the front of the band. If it is too tight, loosen the hook or increase the band size. The simplest way to check whether the band is too tight is to sit down. If it is uncomfortable, then the band is too tight and you need a larger size.

The Bra’s Straps are Comfortable and Stay in Place

Straps should not dig into your shoulders. This is an indication that the bra is not offering enough support. Consider a broader band and broader straps. If the straps slip off the shoulder, make sure the cups are not too big. If the cups and band are a perfect fit, but the straps keep slipping, consider a different strap style.

The Bra’s Underwire Is Comfortable

If you choose an underwire bra, the underwire should not pinch, poke or protrude. The underwire should lie flat against the body without twisting or warping. These are signs that the bra does not fit well. Consider a different style or size.

Buying Bras on eBay

eBay makes it easy to find the perfect bra. Simply type a keyword or search phrase (such as "32B black demi bra") into the search box that can be found on any page. Narrow your search results by choosing the most appropriate category and characteristics. For more control over the search results returned, use the advanced search feature.

Before You Buy on eBay

Before you buy on eBay, take the time to learn about the seller and the item. eBay’s features makes this process easy. There are two checks to perform before you buy.

Check the Seller’s Feedback

eBay’s seller feedback feature allows you to see what others have to say about a specific seller’s products and customer service. Detailed seller ratings give additional information about the seller’s communication, the reasonableness of the seller’s postage and packaging fees, whether the item description was accurate on the listing page, and how long the seller took to dispatch the item. This information can be accessed by clicking on the number displayed next to the seller’s username.

Check the Item Listing Page

Everything that you need to know about an item can be found on the item listing page. This includes bidding and buying information, the item description, the seller’s feedback and contact information, postage and packaging fees, and the terms of the seller’s returns policy. If you have any questions about a listing, use the "Ask a question" link to contact the seller.


Bra measurements should be taken at least once a year, or after any physical changes, to ensure that your bra stays as supportive as it should be. Measuring bra sizes is not an exact science, especially when it comes to larger sizes. Finding the perfect fit might take a bit of trial and error, but when you find a brand that fits, the effort will be worthwhile. In addition, all breasts are different and you should choose the best cut and style for you. A good bra lifts, separates, and supports, and creates the appearance of a slimmer figure, making you look younger in the process.

Band and bust measurements are used to calculate bra size. If your bra fits properly, your breasts should fill the cups without overflowing or leaving empty spaces. The band should fit snugly without being uncomfortably tight, and should not ride up at the back. Straps should stay on the shoulders without digging into them, and the underwire should not prod and poke you. If a bra pinches you or is in any way uncomfortable, try a different size or style. eBay sellers offer a wide selection of bras in a range of colours and styles.

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