Finding the perfect-fitting women's bra is more than just about size – it’s about comfort, confidence, and support. With so many different styles, brands, and sizing systems out there, it can feel overwhelming. However, by understanding the key factors like band size, cup size, and breast shape, you can easily navigate the world of bras and find the one that’s right for you.

Bra Cup Size Chart

Before diving into the nuances of bra fit, it's essential to understand the basic components of a bra size. Bra sizes are typically expressed in a format such as 34B, where:

Band Size: This is the number, and it refers to the measurement around your ribcage, just under your bust.

Cup Size: This is the letter, which represents the volume of the breast relative to the band size.

For example, in the American bra size system, a 34B means the band size is 34 inches, and the bust measurement is 2 inches larger than the band. A 36C would have a band size of 36 inches, with a bust that’s 3 inches larger than the band.

Read more: How To Choose A Bra Cup Size？

How to Measure for a Bra?

To find your bra size, accurate measurements are key. Follow these simple steps:

Measure Your Band Size

Wrap a soft measuring tape around your ribcage just under your bust, ensuring it is snug but not tight. Round to the nearest inch. If the number is even, add 4 inches. If it’s odd, add 5 inches(This is actually a traditional method of bra sizing to help you find a suitable band size.)​.

Measure Your Bust Size

Measure around the fullest part of your chest, ensuring the tape is level across your back. This is where the cup size comes into play​.

Calculate Your Cup Size

Subtract your band size from your bust measurement. The difference correlates to the cup size:

1 inch = A cup

2 inches = B cup

3 inches = C cup

4 inches = D cup, and so on​

Find the corresponding cup letter, for example, a 2-inch difference corresponds to a B cup, and a 3-inch difference corresponds to a C cup.

Common cup size chart (US)

Bra Styles for Different Breast Shapes

Understanding your breast shape can make a world of difference when choosing a bra. Not all bras work for every shape, so here are some common breast shapes and the best bras for them:

Asymmetric

For those with uneven breasts, seamless bras or padded cups work best to create balance and support.

Athletic

If you have an athletic build with a more angular shape, go for underwire bras with a supportive structure to enhance shape and lift.

Bell

If your breasts are fuller at the bottom, a balconette bra or plunge bra can provide lift and create a rounded shape.

Relaxed

For breasts that have more natural droop, soft-cup bras or wireless bras offer comfort and natural support without constriction.

East West

For breasts that naturally point outward, full coverage bras or t-shirt bras are ideal for providing comfort and coverage​.

Round

If your breasts are well-proportioned and round, most bra styles will work. Consider push-up bras or plunge bras for added lift or cleavage.

Side Set

For breasts that sit farther apart, look for bras with centered straps or plunge bras to bring the breasts closer together.

Slender

A minimizer bra or full coverage style will help add volume and create a fuller shape.

Teardrop

If your breasts are fuller at the bottom with a more natural shape, opt for half-cup bras or ballet-back bras to provide comfortable, full support​.

Read more: Which Bra is Best for Daily Use?

Common Bra Fit Issues & Solutions

Why does my old bra still fit, even though I’ve had it since high school?

Bras lose elasticity and shape over time, even if they seem to fit. Bras typically last 6-12 months with regular wear. If your bra is older, it’s likely stretched out and no longer providing proper support. Replace it with a new one in your current size.

Why does my new bra in the same size feel too small?

Sizing can vary between brands and styles. Try a different brand or style, or consider getting professionally measured. Your body shape may have changed, requiring a different size.

Why do I have "armpit fat" when I wear my bra?

Bulging near the armpits often indicates a too-small cup or a poorly fitting band. Opt for a larger cup size or a bra with wider side panels to fully encapsulate the breast tissue.

Why do my bra straps dig in and hurt?

Straps digging into your shoulders usually mean the band is too loose, forcing the straps to carry the weight. Tighten the band or try a smaller band size. The band should provide 80% of the support, not the straps.

Why does my band ride up in the back?

A band that rides up is too loose and not providing proper support. Tighten the band or go down a band size. The band should sit parallel to the ground and feel snug but comfortable.

Why can I only wear my bra on the smallest hook?

Bras should fit snugly on the loosest hook when new. Starting on the tightest hook leaves no room for adjustment as the bra stretches. Try a smaller band size and use the loosest hook initially.

Why is it hard to find my cup size, so I just buy DD or wear two bras?

Issue: Wearing the wrong cup size or doubling up on bras compromises comfort and support. Seek out brands that specialize in extended sizes or consult a professional fitter to find your true size. Such as Plusock plus size bras.

Why do my straps fall down?

Falling straps often indicate a too-large cup or a stretched-out band. Try a smaller cup size or a tighter band to keep the straps in place.

Why do my straps dig in?

Loose bands shift support to the straps, causing discomfort. Adjust the band to fit snugly or try a smaller band size.

Why does my band move around or need constant adjustment?

A constantly shifting band suggests it’s too big. Tighten the band or size down for a more secure fit.

Why is there puckering in my cups?

Puckering or gaps in the cups mean they’re not filled properly. Try a smaller cup size for a smoother fit.

Why does the center gore of my bra stand away from my body?

The center gore (the part between the cups) should lie flat against your chest. Increase your cup size to ensure proper coverage and support.

Why does my bra poke me?

Wires or seams poking into your skin indicate a poor fit. Re-evaluate your cup and band size, and consider trying a different style or brand.

Read more: How to hide the straps of sports bra