What Size Is a Medium in Sports Bra?

Trying to figure out what size is a medium in a sports bra? Use this simple guide to find the perfect fit for your next workout.

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In the great wide world of sports bras, “medium” can mean a lot of things. Depending on the style, cut, and brand of the sports bra, a medium can be anything from a 30D to a 36DD. And that’s just in women’s sizing; men’s and girls’ sizing will have different standards altogether. So how can you be sure you’re getting the right size for you?

What is a Medium in Sports Bra?

A medium in sports bra is a good option for those who need something a little more supportive than a small but don’t want to go up to a large. A mediumsized sports bra will usually have wider straps and may also have an underwire for additional support. If you are unsure about what size to get, it is always best to try on a few different sizes before making your final decision.

How to Measure Your Bra Size

To find your band size, wrap a measuring tape around your rib cage, just under your bust. The tape should be level and snug. Round to the nearest whole number. If the number is even, add four inches. If it’s odd, add five. This is your band size.

To find your cup size, wrap the measuring tape around the fullest part of your chest, making sure to keep the tape level. Then measure from the fullest part of your bust to the band at your rib cage. The difference between these two numbers is your cup size!

If there’s a one-inch difference between your band size and bust measurement, you’re an A cup; two inches, a B; three inches, a C; four inches, a D; five inches, a DD or E; six inches, a DDD or F; seven inches… you get the idea.

How to Convert Your Bra Size

To convert your bra size, first determine your band size and cup size. Band sizes range from 32 to 52, with cup sizes ranging from A to J. To find your band size, measure around your chest, under your arms, and across your back at band level. To find your cup size, measure around the fullest part of your chest.

Once you have both measurements, you can use a bra size calculator or a conversion chart to determine your bra size. If you are between sizes, it is usually best to go up a size in the band and down a size in the cup. For example, if you are between a 34C and a 36B, you would probably be best served by a 34B.

It is also important to keep in mind that bra sizes can vary depending on the brand, so it is always best to try on a few different styles and sizes before making a purchase. And remember, even if you find the perfect fitting bra, it is important to have it professionally fitted every 6 months or so to account for any changes in your body.


After reviewing all the available data, it appears that a “medium” in sports bra sizing is most likely to be a 34C. However, it is important to remember that there is no industry-wide standardization when it comes to bra sizing, so this is only an estimate. The best way to ensure you are getting the right fit is to try on a variety of different styles and brands until you find the one that feels best for you.

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