How to Properly Use a Bra Size Calculator and Converter

Are you tired of constantly having to readjust your bra throughout the day or feeling uncomfortable with your sports bra during physical activity? Then it’s time to make sure you have the right fit!

Taking proper bra measurements and using a bra size calculator is the key to finding the perfect bra. But if you’re unsure how to measure bra size or use a bra size calculator, here’s how you can do it.

Taking Proper Bra Measurements

The first step to getting the right bra fit is measuring for bra sizes and using the bra size chart. Follow our guide below.

Measure Your Underbust

Stand straight and let your arms hang casually by your side. It’s better to have a friend measure you by wrapping a tape measure around your chest, directly under your bust. Ensure the tape wraps around just right, is not too tight and is as straight as possible all the way around.

This represents how the under-band of your bra should fit, so don’t let the tape sit awkwardly over your bra or underwire. You can do this while not wearing a bra, but if you do decide to wear one, make sure it fits right. 

Measure Your Overbust

Again, stand straight with your arms hanging comfortably by your side. Measure the fullest part of your bust (usually over the nipples). For best results ask a friend to assist you.

The tape should rest lightly on your body and straight across your back, parallel to the floor. Do this while wearing a good-fitting, non-padded bra to get the correct measurement.

Use a Bra Size Calculator

Once you have accurately taken your measurements finding your correct size is as easy as one, two, three.

One; find a good bra size calculator. A quick online search will reveal many options. To save the trouble ours can be found here.

Two; enter your measurements into the calculator.

Three; hit the button and bingo – your bra size. Woo hoo. time to go shopping!

Rows of sports bras on display

Bra Conversion Guide

A bra conversion guide is a chart or tool used to convert bra sizes from one measurement system to another. Several measurement systems are used for bras, including the US, UK, European, and Australian systems. So, this guide helps ensure that you get the right bra, regardless of where you are shopping or what measurement system is used.

Typically, this guide includes a chart or table that lists different bra sizes in various measurement systems and the corresponding size in each system. This allows you to find your size in one system and then easily convert it to another system if needed.

Bra conversion guides can be found online or in-store at lingerie or clothing shops. They are helpful for women who are shopping for bras in a different country or those who purchase bras from an international brand. You will find ours at Sports Bras Direct here.

Sister Sizes

Sister sizes are bra sizes with the same cup volume but different band sizes. In other words, they are bra sizes related to each other based on the difference between the band and cup sizes. 

Sister sizes are essential to know because sometimes a bra that fits in one size may not be available in that size, but it may be available in a sister size. Also, if a size does not fit quite right it is worth trying the sister size as it may fit perfectly.

This can be especially helpful for women with larger busts who may struggle to find the right fitting band and cup combination. Check o9ut our Sister Size Guide here.

Get the Right Measurements at Sports Bras Direct

Do you still need help getting the right bra measurements? Use our bra size calculator for more accurate results. Also, check out our bra size conversion guide to ensure you get the correct size in a different measurement system.

You can also ask for assistance from our staff.

Yours in support.

Amy x

Amy Jaffers - Sports Bra Expert

Amy Jaffers

Amy is the face behind Sports Bras Direct, Australia’s largest sports bra website. She's a mother of two, outdoors lover and sports bra expert. Her life mission is to help active women get the support they need as well as assisting women in need through her charitable donations.

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