Before using the bra size calculator, we need your measurements! Grab a piece of paper to write down your measurements!
Reference the image that follows to accurately measure yourself using a flexible measuring tape. Record your measurements in inches.
Using these measurements, input them into the bra size calculator below to find out your true bra size.
Tip: Make sure you keep the measuring tape parallel to the floor when standing. It should be straight, not angled! Stand in front of a mirror or get a friend to help!
Using your measurements that you wrote down previously, enter your numbers (in inches) into the Bra Size Calculator fields below:
*If you'd like to convert your size to a US or International size, see the bra size conversion charts below!
Please note that all estimated sizes can also depend on your breast shape and you should use it as a starting point to find your best fitting bra! There can be variations between different brands in sizing and even styles. It is recommended that you try on a few bras in the range of this estimated size to find your absolute perfect fit. See our list of where to buy bras in your proper size here.
This website uses UK sizes, which are highly recommended as US sizing tends to be outdated and sloppy. The main difference is when you start to hit the DD cup size as you will see below. If you'd like to convert your calculated UK size to its US size, use the international bra conversion charts below:
There's a secret that many large scale lingerie companies don't want you to know -- there are a plethora of bra sizes outside of the standard A-DD range and you very likely might fit into one of them.
The good news: most brands outside of the United States already know this and have been manufacturing bras that fit the majority of women for ages. The United Kingdom, for example, knows that breasts are not created in a limited size range and caters to all shapes and sizes. Band sizes ranging from 28 to 52 and cup sizes ranging from AA to J are the norm there, and so they should be!
In many US department stores, the method of sizing they use is outdated and super inacurate. It is common for a lingerie fitter to take your under-bust measurement and add 4 (or even 5!) inches to that number. So if you measure a true 30" around, your band size would be rounded up to 34" in order to fit their brand sizing. This results in a less-than-optimal bra fitting because the band is going to be too loose, and the cup size is going to be too small due to the additional band size allowance.
Why are they fitting you into a band size that is NOT your actual measurement?! The answer is simple: to cut manufacturing costs. Less SKUs equals lower production cost. If you measure 30 inches under your bust, your band size should be exactly 30 inches. Quickly run away from any bra fitter who adds additional inches to your measurement!
This website was created to give you your TRUE bra size using your TRUE measurements, which results in the best, most optimal fit you will ever experience. This is how the UK lingerie companies size their bras, and slowly but surely many US manufacturers are moving over to this method. We cannot all be expected to fit into an A, B, C, or D so I truly hope this helps you on your journey to finding the perfect bra!
The band is the one part of the bra that actually supports your breasts. You want the band to be pretty tight and to allow for some stretch as you wear it. When buying a new bra, the clasps should be fastened to the outermost setting to allow for tightening as your bra stretches with wear. The band should not be able to be pulled out more than 2 inches from your back. When you raise your arms, the band should not move.
Contrary to what many believe, the straps are not what support your breasts. Your straps should be adjusted so they don't slide off of your shoulders and don't cause the back of your bra to ride up. The band should remain parallel to the floor at all times. If straps are digging into your skin, this is a sure sign that they are compensating for too much of your breast weight.
Depending on your own breast shape, one style of bra may fit better than another. Full coverage cups, demi cups, and/or plunge cups all fit various shapes of breasts differently. Be sure that your cup has no gaps from any angle. If you notice gaping along the top edge, try a style with a lower cup profile or a smaller cup size. The underwire or side of the cup should encompass all of your breast tissue, including the side area under your armpits.