BRA SIZE CALCULATOR
Find Your Perfect Fit
Instant calculator | conversion table | FAQs
Calculate Your Bra Size
inches
Measure snugly directly under your breasts
inches
Measure around the fullest part of your breasts
International Bra Size Conversion Table
US/UK • EU • FR • IT • AU • JP
| US / UK Band | EU / FR / BE / ES | Italy (IT) | Australia (AU) | Japan (JP) |
|---|---|---|---|---|
| 28 | 60 | 00 | 6 | 60 |
| 30 | 65 | 0 | 8 | 65 |
| 32 | 70 | 1 | 10 | 70 |
| 34 | 75 | 2 | 12 | 75 |
| 36 | 80 | 3 | 14 | 80 |
| 38 | 85 | 4 | 16 | 85 |
| 40 | 90 | 5 | 18 | 90 |
| 42 | 95 | 6 | 20 | 95 |
| 44 | 100 | 7 | 22 | 100 |
Cup sizes (A, B, C, D, DD, E, F…) are the same across all regions
Example: US 34C = EU 75C = AU 12C = JP 75C
01
How does the Bra Size Calculator work?
It uses your underbust (band) and overbust (bust) measurements. The band size is derived from the underbust, while the cup size is calculated from the difference between the two measurements using standard international charts.
02
What measurements do I need for accurate results?
Just two easy measurements:
• Band size: Snug measurement directly under your breasts.
• Bust size: Around the fullest part of your breasts (wear a non-padded bra).
• Band size: Snug measurement directly under your breasts.
• Bust size: Around the fullest part of your breasts (wear a non-padded bra).
03
How do I correctly measure my band size?
Stand straight, wrap a soft tape measure snugly under your bust (level all around). Breathe normally and round to the nearest even number (e.g., 32, 34, 36).
04
How do I measure my cup size?
Measure around the fullest part of your breasts. Subtract your band size from this number. Each inch of difference equals one cup size (1″ = A, 2″ = B, etc.).
05
Why does my calculated size sometimes not fit perfectly?
Bra brands use different sizing standards. The calculator gives you a great starting point, but the best way to confirm is always to try the bra on.
06
Are online bra size calculators accurate?
Yes — they are about 80-85% accurate when measurements are taken correctly. They’re an excellent first step before shopping or visiting a fitter.
07
How do US, UK, EU, and other bra sizes compare?
Our calculator automatically converts between US, UK, EU, FR, IT, AU, and JP sizes. Cup letters are mostly the same, but band numbers differ slightly by region.
08
How often should I recalculate my bra size?
Every 6–12 months, or immediately after pregnancy, breastfeeding, significant weight change (±5 kg / 11 lbs), or surgery.
09
What is “sister sizing” and when should I use it?
Sister sizes have the same cup volume but different band sizes (e.g., 34C = 36B = 32D). Use them when your exact size is out of stock or feels too tight/loose in the band.
10
Can pregnancy, weight changes, or age affect my bra size?
Absolutely! Breasts can grow or shrink with hormonal changes, weight fluctuations, pregnancy, or as you age. Re-measure every time your body changes.
Pro tip: Always try on bras in your calculated size — the tape measure never lies, but the mirror confirms the fit!