September 28, 2023
Find your perfect bra size with our comprehensive guide. Learn how to measure with a tape measure and perform the fit test, or explore the pros and cons of using an online calculator or visiting a lingerie store for a professional fitting. Discover the advantages of sister sizing, considering breast shape and fullness, and the trial and error method.


Many women struggle with finding a bra that fits comfortably and correctly. One of the biggest obstacles to finding the right bra size is not knowing how to measure for it. This article aims to provide a comprehensive guide for measuring your bra size, so you can find the perfect fit for your unique shape.

The Tape Measure Method

One of the most common ways to measure your bra size is with a tape measure. To get started, you’ll need a soft tape measure and a mirror.

The first measurement you’ll need is your underbust measurement. Stand up straight and wrap the tape measure snugly around your ribcage, just beneath your breasts. Make sure the tape measure is parallel to the ground and not twisted. Round the measurement to the nearest even number.

The second measurement is your overbust measurement. While still standing straight, wrap the tape measure around the fullest part of your bust. Again, make sure the tape measure is parallel to the ground and not twisted. Round this measurement to the nearest even number.

Once you have these two measurements, you can use a bra size chart or calculator to determine your band and cup size. To calculate your band size, subtract your underbust measurement from your overbust measurement. The difference corresponds with your band size. For example, if the difference is 2 inches, you would wear a 34 band. To calculate your cup size, subtract your band size from your overbust measurement. Each inch difference corresponds to a different cup size. A 1-inch difference is an A cup, a 2-inch difference is a B cup, and so on.

The Fit Test

Measuring for your bra size is a good starting point, but it’s important to try on different sizes and styles to find the best fit. The fit test involves putting on a bra and checking for the following:

  • Gapping between the bra and your breast
  • Spillage over the top of the bra or at the sides
  • The band riding up your back
  • The straps digging into your shoulders or sliding off

If any of these issues occur, try a different size or style.

The Online Calculator

Another option for measuring your bra size is to use an online calculator. These calculators typically require you to input your underbust and overbust measurements, as well as additional details about your breast shape and fullness. The calculator will then give you a recommended size. The advantage of this method is convenience, but there are potential downsides. Online calculators may not take into account the nuances of your body shape or provide accurate recommendations.

The Bra Fitting Appointment

If you’re unsure about measuring yourself or want a more personalized experience, consider booking a bra fitting appointment with a professional. Lingerie stores often offer this service for free, and it involves an expert taking your measurements and recommending bras that fit your shape and style preferences. This is a great option for anyone who wants to ensure they’re getting the best fit possible.

The Sister Size Method

Sister sizing involves trying different sizes that have the same cup volume but different band sizes. For example, if you typically wear a 34C, you might also try a 32D or 36B. The advantage of sister sizing is that it allows you to fine-tune your fit and find a size that feels the most comfortable for you.

The Shape Factor

Another consideration when finding your perfect bra is breast shape and fullness. Some styles of bras are better suited to certain breast shapes, so it’s worth exploring what styles work best for you. Fullness also plays a role in finding the right fit, and it’s helpful to know whether your breasts are shallow or full, and whether they’re more full on top or on bottom.

The Trial and Error Method

At the end of the day, the best way to find your perfect bra size and fit is through experimentation. Try different sizes, styles, and brands, and don’t be afraid to step out of your comfort zone. You might be surprised by what feels the most comfortable and supportive for you.


Measuring your bra size doesn’t have to be a daunting task. By using one or more of the methods outlined in this article, you can find the perfect fit for your unique shape. Whether you prefer measuring with a tape measure or having a professional fitting, don’t be discouraged if it takes a bit of trial and error to find the right bra. Remember, finding a comfortable and supportive bra can make all the difference in your day-to-day comfort and confidence.

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