Bra Size Calculator
Your bra size in 30 seconds
Enter two measurements and we'll show you your starting size in UK sizing, plus lingerie and swimwear we have in stock right now.
Without a bra, tape measure firm and level.
Tape measure relaxed, wearing a soft bra.
Sizing varies between brands and rarely translates directly. Tell us what you wear and how it fits.
Tick everything that applies:
Start your fitting from this size.
Bras in size
See allSwimwear in size
See allSize is only confirmed by trying it on
When your order arrives, fasten the bra on the loosest hook. Then lean forward and scoop your breast tissue into the cups — from the side and underneath — so everything sits inside and lies evenly. Without this step even the right size can look too big or too small. Once you have done that, check four things:
- the band sits level and does not ride up at the back
- all breast tissue fits inside the cup with no spillage over the top or under the arm
- the gore (centre panel) lies flat against your chest
- with straps slipped off, your bust is still supported
If any of these do not work out, get in touch before sending the parcel back. Usually one size adjustment is all it takes — no need to give up on the style.
If something does not feel right, try the neighbouring sizes — same cup volume, different band:
Would you like us to take a look together?
Send us your result and we'll reply with specific advice on where to start and which styles suit your breast shape.
Paste your copied result and send it to sklep@karoline.pl — we reply on working days. Near Zielona Góra and speak Polish? Book a fitting with us.
How to measure yourself for a meaningful result
Measure your underbust without a bra, on an exhale, pulling the tape snug and keeping it level all the way round. This measurement does most of the supporting work, so any slack built in “just in case” will skew the whole result.
For the bust measurement, put on a bra — ideally one with soft cups that gathers your breast tissue well. Measure across the fullest part without pulling the tape. If your breasts differ noticeably in size, fit to the fuller side; the smaller side can be balanced later with strap adjustment or an insert.
Why your old 75D is not always a 34D
Sizing is not standardised across brands. UK sizing simply reaches further because it uses doubled letters, while mainstream brands tend to stop at E or F. A woman who needs a larger cup often ends up in a smaller one and compensates with a wider band. 34G only sounds alarming until you compare it to the actual volume it holds.
The second reason is more straightforward: a great many people wear a band two sizes too large and make up for it with a cup that is too small. Translating that label directly carries the same fit problem into the new bra. That is why the second tab asks not just for your size, but for how it actually behaves on your body.
What sister sizes are
A cup does not have a fixed size. Its volume depends on the band it was cut for, so 34F and 36E hold roughly the same amount of breast tissue despite looking very different on a label. Move one band size and the cup letter shifts one step the other way.
In practice this is useful: if the band digs in or rides up, you do not need a completely different style — just try the sister size in the same model.
Can't find your size in stock?
This page shows only what we have in our warehouse, ready to ship the same or next working day. Stock changes daily, so it is worth checking back.
The full range of British brands — including rare band sizes and the largest cups — is available to order at KAROline.pl. Delivery takes a little longer, but the choice is incomparably wider.
