how to find your bra size

Whether or not you wear a bra is a matter of personal choice, but even if you only wear one occasionally, you still need to know how to properly measure your bra size. This will ensure that those you own fit, flatter and offer all the support they're intended to.

While a good bra goes completely unnoticed, a bad bra can come between you and a productive day in the library, a great night out, or simply the ability to make your graceful descent down a flight of stairs. Unfortunately, many of us own far too many that fall into the latter category. "It is not uncommon for people to swap between just two bras despite owning between 10 and 20 of them," explains Kelly Dunmore, chief lingerie stylist at Rigby & Peller.

The bra-wearers among us will also know that our preferred style can change due to multiple factors, including — but not exclusive to — our outfit, the time of the month, and as our breasts develop and change in size. So, how to measure for a bra that fits perfectly? We've broken down everything you need to do to get the right bra size first time — and improve the ratio of good to bad bras in your wardrobe.

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Where to begin

A common mistake is refusing to consider the possibility that your bra size has changed since the last time you were measured. In addition to the impact of age and lifestyle, your size will likely vary depending on the bra itself. But though sizing differs from brand to brand, there are two basic measurements that will guide you regardless: the band size, and the cup size. Many bra-size calculators available online will do the maths for you, but if you want to be sure, try the following method…

How to measure your bra band size

Stand upright without a bra on, and using a measuring tape, measure around your back and under your bust, where the band of a bra would usually sit. Make sure the tape is going around in a steady, even line. It should feel snug, but not tight. Measure in inches: if you land at an even number, that is your band size. If it's an odd number, round it up to the nearest inch to find your size.

How do I work out my cup size

For this bit, most retailers recommend you wear your current favourite (ie most comfortable), bra, so that your boobs are held in the place you actually want them to be. Then measure around the fullest part of your chest. Next, subtract your band size from this bust measurement. The difference denotes your cup size. 0=AA; 1=A; 2=B; 3=C; 4=D; 5=DD; 6=F; 7=FF; 8=G; 9=GG; 10=H; 11=HH; 12=J; 13=JJ; 14=K and so on. Combine your band and cup size, so you have a number followed by a letter, for example: 34F. This is your benchmark measurement — but remember, there's a whole lot of nuance involved in finding the perfect fit, like considering your style and fabric preferences.

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How do I know if my bra fits properly?

"Once you've fully adjusted the garment, you really shouldn't feel like you're wearing anything," explains Miryha Fantegrossi, vice president of merchandising and design at lingerie brand Wacoal. Start by doing up your bra using the loosest hook. Then adjust the straps so that they are tight, but not digging into your shoulders. If you look at yourself sideways in a mirror, your breasts should sit midway between your shoulders and elbows. The best way to assess the fit? Put on your slinkiest T-shirt: "If you can see any lines or bulging skin, you know it's not the right size," explains Emilie Moraes, resident expert at Harvey Nichols.

How do I know if the band is firm enough?

The band provides 80 per cent of a bra's support – so if it's too loose, it's not going to hold your breasts in prime position. Instead, it should fit firmly to the body. "You want to [be able to] get three fingers up the back of a bra, and two fingers all the way around," explains Dunmore. It should be "horizontal around the body, and there shouldn't be any places where it's pulling up, dipping down, or uneven," agrees Cora Harrington, founder and editor-in-chief of The Lingerie Addict.