Fit guide
Measure your bra size the right way
Most of us are wearing the wrong size without knowing it. Grab a soft measuring tape and find yours in under two minutes — right from home, no store visit needed.
The basics
Three steps, one soft tape
Wear a soft, unpadded bra while you measure so the numbers reflect your natural shape. A ribbon or string works too if you don't have a tape — just mark it and lay it against a ruler after.
Measure your band
Wrap the tape around your ribcage, directly under your bust. Keep it snug and level all the way around, then round to the nearest whole number.
Measure your bust
Wrap the tape around the fullest part of your chest, keeping it level across your back. Don't pull it tight — it should sit comfortably.
Find your cup
Subtract your band number from your bust number. Every inch of difference moves you one cup size up, starting from A.
Try it yourself
Your size calculator
Snug, straight around your ribcage under the bust.
Around the fullest part of your chest, tape level.
Your estimated size
34B
A great starting point. Fit still varies by style, so a sister size might feel even better.
Shop bras in this sizeOnce you know your size
Wearing it right matters just as much
Even the correct size can feel off if it's worn wrong. Here's how each part of the bra should actually sit on you.
Underband
Contrary to popular belief, your straps aren't doing the heavy lifting — about 80% of your support should come from the band. As shown in most fittings, the band should sit straight and comfortably around your back.
- If it rides up or pulls away easily, it's too loose.
- If everything else fits but the band doesn't, try a bra extender before sizing up.
Straps
Straps are only meant to provide about 20% of your support — the rest comes from the band and cups. Worn wrong, they can lead to sore shoulders and backaches over time.
- You should be able to slide two fingers under comfortably — no digging in.
- If they keep slipping off your shoulders, they're too loose. Tighten them.
Cups
The cup is the main event — it shapes and holds you, so getting this right changes everything. Bend forward slightly and lift your breasts up and inward into each cup before fastening.
- Bulging at the sides or top means the cup is too small — go up a size.
- Extra space or wrinkling means it's too big — go down a size.
Underwire
Not every bra has one, and that's fine — wirefree styles offer plenty of support too. For wired bras, the wire's job is to sit flat against your ribcage, never on breast tissue.
- If it digs into you, the cup is too small — try a bigger one.
- If there's empty space at the wire, size the cup down.
Troubleshooting
Signs your bra doesn't fit
A quick way to spot what's off — and what to try instead.
Band rides up at the back
Likely cause: the band's too big. Try: a firmer hook, or size down the band.
Straps dig in or keep slipping
Likely cause: the band's too loose, so straps overcompensate. Try: tightening the band first.
You're spilling over the cups
Likely cause: cup's too small. Try: sizing up a cup, or a sister size.
Cups are gaping or wrinkled
Likely cause: cup's too big. Try: sizing the cup down.
Underwire sits on breast tissue
Likely cause: wrong cup or the style isn't right for your shape. Try: a bigger cup or a different silhouette.
Red marks after taking it off
Likely cause: band or straps are too tight. Try: a looser hook or a size up in the band.
Good to know
Try a sister size
Sister sizes hold the same cup volume even though the band and letter change. The rule: go up a band, go down a cup — or the reverse. Worth trying if your band feels wrong but the cup feels right.
| Your size | Smaller band option | Larger band option |
|---|---|---|
| 32B | 30C | 34A |
| 34C | 32D | 36B |
| 36D | 34DD | 38C |
| 38DD | 36E | 40D |
Re-measuring
When to check your size again
Your body changes, and so does your bra size. A few moments worth a re-measure:
Weight changes
Even a small shift up or down can change how your bra sits.
Pregnancy & after
Switch to soft, wireless support during pregnancy, then re-measure once you're settled into feeding.
Shop nursing bras →Every 6–12 months
Bodies shift gradually. A routine check keeps you comfortable year-round.
After surgery
Whatever the reason, always re-fit once you've fully recovered.
Shop post-surgical bras →Once you've got your size
Shop by what you need right now
Same fit principles, different moments. Here's where to start.
Questions
