A Guide to Bra Size Chart, Bra Size Calculator, and bra size converter

This is a question many women struggle with throughout their life. An estimated 75 to 80% of modern women wear bras that don’t fit them correctly on an everyday basis. Wearing a well-fitting bra is key to avoiding daily discomfort, keeping your breasts secure, preventing chronic pain, and lifting and shaping your bust. Therefore, whether or not your bra fits you well has a significant impact on your daily comfort, appearance, and even long-term physical health. With that in mind, it’s shocking that the vast majority of women wear ill-fitting bras every single day.

Statistically speaking, it’s more likely than not that the bra size you wear is not actually the size that fits you best. Bra sizing is complicated, so determining whether or not a bra fits you correctly tends to be much more difficult than it seems. Plus, your bra cup size varies depending on the brand of the bra, the sizing system it uses, and how your body changes over time. Every woman should know how to measure their own bra size accurately so they’re never left wondering about what their ideal cup size is and whether or not they’re wearing the right bra.

how to measure bra size

Many different factors are involved in determining your ideal bra size, which can make measuring yourself to figure out your bra size very complicated. However, learning how to measure your own bra size at home with as much accuracy as possible gives you the power to make sure every bra you buy and wear fits you well.

It is unwise to rely on the sizes that employee fitters at lingerie shops and department stores assign you. While these recommendations can definitely point you in the right direction, you should treat them as a rough estimate rather than fact. Most professional fitters just hastily measure your bust over your shirt and current bra, resulting in measurements that are significantly skewed. You’ll end up with a much more accurate idea of your own bra size if you measure it yourself from the comfort of your own home.

Bust Size vs. Bra Size

It’s easy to get confused over the difference between your bust size and your bra size. After all, the purpose of bras is to fit, support, and secure your bust. However, the size of your bust is not the only thing you need to consider

In reality, your bust size is just one factor that influences your ideal bra size. The size of your bust determines what your bra cup size is and what cup letter you should wear, but a well-fitting bra fits your body as a whole. Basing your bra size entirely off of your bust size is a common mistake that results in many women wearing bras that don’t fit them correctly. It’s important to learn about all the various factors and measurements that impact your bra size in order to make a well-informed, accurate decision the next time you go bra shopping.

How to Measure Bra Band Size

HOW TO MEASURE BRA BAND SIZE, Bra Size Chart, Bra Size Calculator, and bra size converter

How to Measure Bra Cup Size


Bra Size Charts, bra cup size comparison

Bra size charts are a measurement tool that lays out the basics of bra sizes and how they correspond to certain band and bust measurements. They organize bust and band measurements into a comprehensive chart that matches these measurements with bra cup letters and band sizes. These charts can be an extremely helpful resource for at home-bra measuring.

You can find bra size charts for most common international sizing systems, including the US, UK, and EU systems. You can also find bra size charts for sister sizes—bra sizes that are equivalent in cup volume but differ in cup letter and band size—which can help you determine which sizes to try if your measurements are in between sizes.

Bra Size Calculator

Bra size calculators are another valuable tool that can help you determine your ideal bra size based on your at-home measurements. These calculators allow you to enter your bust measurement and band measurement separately and assign you a bra size according to your entries. This saves you from the confusion of having to manipulate your raw measurements to calculate your ideal bra size by hand.

If you’re shopping online for a new bra, always check if the online shop offers a bra calculator. Many online lingerie stores provide a bra size calculator that assigns you a size that is specific to the brands they sell. Even if you know your normal bra size, input your measurements into a bra size calculator whenever possible to make sure your size matches up with the sizing of the bra you’re considering buying.

Bra Size Calculator USA vs. Bra Size Calculator UK

Bra size calculators are an especially helpful resource when it comes to calculating your bra size in a sizing system that is unfamiliar to you. The US and UK bra sizing systems have subtle but significant differences between them. These two systems are two of the most commonly used sizing systems among mainstream lingerie brands, so you’re likely to come across both of them at some point throughout your bra shopping endeavors regardless of which part of the world you live in.

There are some important differences between using a US bra size calculators versus using a UK bra size calculator. US bra size calculators generally ask you to enter your measurements for bra cup sizes in inches, while UK calculators accept data for bra cup sizes in centimeters. However, some more advanced bra size calculators—which are for free use online—allow you to decide whether or not you want to input your data in inches or centimeters as well as choose which sizing system you want your bra size to match.