Global Araç
Bra Size Converter
Cup volume depends on the band. Move up a band size and drop a cup letter (or vice versa) to keep the same cup volume.
- 32D ≈ 34C ≈ 30DD
- 34B ≈ 36A ≈ 32C
- 36DD ≈ 38D ≈ 34DDD
| US | UK | EU | AU |
|---|---|---|---|
| 30 | 30 | 65 | 8 |
| 32 | 32 | 70 | 10 |
| 34 | 34 | 75 | 12 |
| 36 | 36 | 80 | 14 |
| 38 | 38 | 85 | 16 |
| 40 | 40 | 90 | 18 |
| 42 | 42 | 95 | 20 |
| 44 | 44 | 100 | 22 |
| US | UK | EU | AU |
|---|---|---|---|
| A | A | A | A |
| B | B | B | B |
| C | C | C | C |
| D | D | D | D |
| DD | DD | E | DD |
| DDD / F | E | F | E |
| G | FF | G | F |
| H | G | H | G |
| I | GG | I | H |
Convert bra sizes across the four major sizing systems — US, UK, EU/French, Australian/NZ — plus the sister-size rule (going up a band size means going down a cup letter for the same volume, and vice versa). Useful when shopping international brands (Bravissimo UK, Chantelle French, Berlei Australian) or trying to find a comfortable fit when your usual band-cup combo isn’t working. Tool also flags the cup-letter divergence above DD: the US uses DD/DDD/F/G/H/I/J; the UK uses DD/E/F/FF/G/GG/H/HH; EU stops at single letters and uses numbers for band size.
Why bra sizing is confusing: the “system” is actually multiple legacy systems merged. Band size in US/UK is in inches (32, 34, 36, 38, 40); EU uses cm (70, 75, 80, 85, 90). Cup size in US doubles letters past D (DD, DDD, F, G); UK adds prefix letters (DD, E, F, FF, G, GG); EU and Aussie systems vary again. Above a US 36DD, US and UK letters diverge: US 36F equals UK 36DD, US 36G equals UK 36E, etc. So an American shopping a UK brand needs to subtract one letter; a Brit shopping US needs to add one. Get this wrong and the cup is either too small (gore digging in) or too large (cup wrinkling, no support). Most US bra retailers don’t carry above 36DD-G; UK brands routinely go to K/L cups, which is why fuller-busted shoppers often have better luck with UK brands.
The sister-size principle: a 32D, 34C, 36B all hold approximately the same cup volume — they’re “sister sizes.” If your normal size is uncomfortable (band too tight, cup wrinkles, straps slip), trying a sister size often solves the issue without changing the fundamental volume. Going up a band: drop a cup letter (32D → 34C). Going down a band: up a cup (32D → 30E in UK or 30DD in US). Many fitters now reject the old “tight band, small cup” advice in favor of “comfortable band, larger cup” — most women have been wearing bands too large and cups too small. Modern fitting standards (like the UK “methodology” popularized by A Bra That Fits) emphasize: band should sit horizontal and snug enough to hook on the loosest hook initially; cup should fully contain breast tissue without spillover or wrinkling.
Nasıl Kullanılır
- Enter your current band size in inches (28-44 typical) or centimeters (60-110).
- Enter your cup letter (A through K or higher).
- Pick your current sizing country: US, UK, EU/French, AU/NZ.
- Read equivalent sizes in all other systems instantly.
- Check sister-size suggestions — same volume, different band/cup combo. Useful if your usual size doesn't fit comfortably.
- When shopping across countries, double-check the brand's specific size chart — some EU brands run smaller or larger than the standard EU sizing, and individual brand variation matters more than the system difference.
Ne Zaman Kullanılır
- Shopping international brands — UK and EU brands often offer ranges (especially fuller-busted) that US brands skip.
- Trying a new brand whose sizing chart differs from your usual brand — converting helps you start with the right size.
- Fit problems with current bra — sister-size suggestions often solve 'almost-but-not-quite' fit issues.
- Online shopping return-prevention — knowing the system difference up front beats ordering wrong and returning.
Ne Zaman Kullanılmaz
- Sports bras and bralettes — those use S/M/L/XL sizing that doesn't translate to band-cup notation.
- Mastectomy bras and post-surgical fitting — those require professional fitting; size charts don't capture asymmetry or prosthesis fit.
- Maternity / nursing bras — those size up dramatically with milk supply and milk-let-down; lactation consultants typically suggest going one full band and one cup up while breastfeeding.
- First-time bra fitting (teens, post-major-weight-change) — get measured in person at a specialty store like Nordstrom, Bravissimo, Soma, or a department store fitter for the first time.
Yaygın Kullanım Senaryoları
- Educational use — demonstrating the underlying concept
- Onboarding a colleague who needs the same calculation/conversion
- Verifying a number or output before passing it on
- Quick conversion during a typical workday
Sık Sorulan Sorular
Why is my bra size different in different brands?
Vanity sizing, manufacturing variation, and brand-specific scaling. Victoria's Secret runs a band size larger than most US brands (their 34 is more like a 36 elsewhere). Aerie runs slightly smaller. UK brands like Bravissimo and Curvy Kate use UK sizing with their own house adjustments. EU brands vary by country: French brands run small in band, German brands run accurate. Always check the specific brand's measurement chart, not just the country system. Read recent reviews mentioning whether the brand 'runs small' or 'runs large.'
What's a 'sister size' and when should I try one?
Sister sizes share the same cup volume but distribute it across different band-cup combos. 32D, 34C, 36B are sisters; 32D, 30DD, 28E are also sisters. Try a sister size when: (1) the band feels right but cup wrinkles or has gaps (go down to a smaller-cup-letter sister, e.g., 34D → 36C). (2) Cup fits but band rides up or feels loose (go down a band size, up a cup, e.g., 36C → 34D). (3) Brand doesn't carry your exact size — find a sister size they do carry.
How do I measure myself for a bra?
Use a soft measuring tape. (1) Underbust: measure tightly around your ribcage, just below the breast tissue, in inches. Round to nearest whole inch. That's your band size in US/UK (some methods add 4 if even, 5 if odd; modern methods don't add anything — measure tightly and use that number). (2) Bust: measure loosely around the fullest part of your breasts, while wearing a non-padded bra. (3) Cup = bust − band. Each inch difference = one cup letter. 1 inch = A, 2 in = B, 3 in = C, 4 in = D, 5 in = DD/E, 6 in = DDD/F, 7 in = G, etc. (Cup letters past D differ US vs UK — see the converter.)
Why don't US brands carry sizes above 36DD?
Historical inertia and assumptions about American demographics that no longer hold. US bra retail has long stopped at 36DD or 38DD as 'plus-size territory,' relegating fuller-busted shoppers to specialty retailers (Bare Necessities, Lane Bryant Cacique) or to UK / EU brands that carry to K, L, M cups. Bravissimo (UK) is the leading specialty brand for fuller-bust + small-band combinations (28FF through 40K). Curvy Kate, Panache, Freya, and Cleo also serve this market. Many US fitters now suggest UK sizing as the default for women above 32D / 34DD because the system has more granularity at fuller cups.
What's the most common bra-fit mistake?
Wearing the band too loose and the cup too small. Old-school fitters added 4-5 inches to underbust measurement to get band size, resulting in bands that ride up the back (the band is supposed to do 80% of the support work — if it's loose, the straps and cups overcompensate, causing shoulder pain and cup spillover). Modern fitting starts with the actual underbust measurement, no addition. The band should sit horizontal across your back, fitting snug on the loosest hook initially (it'll stretch over time; tighten to middle/tightest hook as it loosens). Cup should fully contain breast tissue without bulge, wrinkle, or gap.
How often should I replace bras?
Quality bras last 6-18 months of regular wear. Signs to replace: band stretches and rides up even on tightest hook; underwire pokes through fabric; cups discolored or stretched; straps don't tighten enough. Owning 5-7 bras and rotating prolongs all of them — wearing the same bra two days in a row is the fastest way to break elastic. Hand-wash or use a lingerie bag in cold water; never put bras in the dryer (heat destroys elastic). Sports bras typically last 6-12 months of regular use; replace when bounce control noticeably decreases.