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The precise way to find your bra size
A free tool for every woman in India who has ever guessed her size off a shelf. Enter two measurements and get an accurate band, cup, sister sizes and international conversions — all calculated on your device, never stored.
Keep the tape snug and level right under the bust, worn over a thin, unpadded bra.
Keep the tape loose and level over the fullest point, letting it rest without pressing in.
Both measurements are needed before we can calculate.
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An approximate silhouette — real cut and coverage vary by brand.
International conversion
Your size, translated across sizing systems
No single label rules the world of bra sizing. The very same fit can be sold as a 34B on an Indian rack, a 34B in Britain, a 34B in America, and a 75B the moment you're shopping in France — the letters only start pulling apart once you pass a D cup. Calculate above, and your match lights up in the table below.
| India / UK | US | EU / France | Band (cm) |
|---|
The method
How your size gets calculated
Forget the old habit of padding a few extra inches onto your underbust — that workaround only existed because vintage elastic barely stretched. Today's fit specialists work from your real numbers, and so do we.
Take the band
Circle the tape snugly beneath your bust, keeping it parallel to the floor all the way around. Round to the nearest whole figure — that's your band, taken exactly as measured.
Take the bust
Loop the tape gently over the fullest point of your bust. It should rest against you, not dig in or reshape anything underneath.
Read the difference
Bust number minus band number gives you the gap. Each inch of that gap climbs one cup letter — one inch is A, two is B, three is C, and so forth.
cup difference = round(bust, in) − band
0=AA · 1=A · 2=B · 3=C · 4=D · 5=DD/E · 6=F · 7=FF · 8=G
Worked example
Picture an underbust of 81 cm (≈31.9″), which rounds to a band of 32. A bust of 94 cm (≈37″) rounds to 37, leaving a 5-inch gap — a DD cup, for a final size of 32DD. If that size proves elusive on the rack, its sister sizes 34D and 30F carry near-identical volume.
Beyond the number
Which bra style suits your shape
Your calculated size gets you to the right band and cup — the style you choose then decides how it actually feels and looks under clothes.
T-shirt bra
Smooth, seamless moulded cups that stay invisible under fitted tops. A dependable daily starting point in your calculated size.
Full coverage
Cups that rise higher and cover more, spreading weight evenly — often the most comfortable choice for larger cup sizes.
Balconette
A lower, straighter neckline that lifts and rounds the shape, popular under square or wide necklines.
Plunge
A deep centre front for low necklines, usually with angled cups — check the gore still sits flat against your breastbone.
Sports bra
Compression or encapsulation styles rated by activity level; many brands size these separately from everyday bras.
Wire-free
Soft-cup styles without underwire, often sized slightly generously in the cup — useful post-surgery, in pregnancy, or for sensitive days.
Before you shop
Common measuring mistakes
Measuring in a padded bra
Foam and moulded shapes inflate your bust number without you realising. Switch to something thin and unlined, or measure with nothing on at all.
Over-tightening the tape
Firm is fine; crushing isn't. If you can't slide two fingers under the band comfortably, ease off before reading the number.
A tape that isn't level
Glance in a mirror before you note the number — it's easy for the back of the tape to drift upward without you noticing.
Swearing by a single brand
Every label cuts to its own pattern. Treat your calculated size as a first guess, then let the way it actually sits make the final call.
Overlooking sister sizes
When your exact number is sold out or almost-but-not-quite right, the sister size beside it usually solves the problem instantly.
Never checking again
A change in weight, a new fitness routine, pregnancy or nursing — small life shifts move both band and cup more often than people expect.
Questions
Frequently asked questions
Showing our top 15. See the full FAQ page for 25 questions, with search.
Completely, and there's no catch — no account, no trial period, no cap on how many times you come back to recalculate.
Accurate enough to shop confidently, though never absolute — fabric, wire shape and each brand's cutting block all tug the final fit slightly. Read the result as a strong starting point rather than the last word.
Because no two labels are cut from the same pattern. A 34B in one store can behave like a 34C in another — completely ordinary, and precisely why sister sizes were invented.
No need — that padding trick is a holdover from decades of stiffer, less forgiving fabric. Your real underbust number is all this calculator asks for.
A size next door that holds the same cup volume. Nudge the band up one and the cup down one letter (or the reverse) and the fit stays close to identical.
Aim for once or twice a year, plus any time your shape shifts noticeably — after a change in weight, pregnancy, nursing or surgery.
Only briefly. A band that's too generous rides up and quietly shifts the entire support job onto your straps. Snug and level on the loosest hook is what actually holds its shape through the day.
That's just elastic relaxing with wear — completely expected, which is exactly why every band comes with a spare hook or two. Tighten the hook rather than buying down a size.
The number carries over, but soft-cup and wire-free styles tend to run a little roomier, so some people drop a cup size when switching over.
Very easily. Band and cup capture circumference and volume, not shape — root width and projection still vary widely between two people in the identical labelled size.
Cup volume usually reacts first to weight change, pregnancy or nursing, while the underbust tends to stay comparatively steady.
Level band that stays put on the loosest hook, a centre gore resting flat against your breastbone, and cups that contain everything smoothly — no spilling above, no gaping at the sides.
Look to the sister sizes listed with your result — same cup volume, different band, and often much easier to actually track down.
Yes — a well-fitted, unpadded bra, a natural stance in front of a mirror, and a tape kept level are really all it takes.
There's no single global standard above a D cup, so brands choose their own labelling — some use DD, others DDD or E for the same volume. Always check that brand's specific chart if you're between systems.