Wacoal bra size chart, converted to UK and US sizes

Wacoal's international guide pairs US cups AA to J with UK AA to GG. The longer ladder to US O on Wacoal America's site belongs to its Elomi, Freya and Fantasie section. In all five calculator runs that returned a size, Wacoal put the band 2 to 3 in above the underbust. The calculator runs are from 25 September 2026; the international guide was opened 13 October 2026.

Same tape, three answers

**34 in underbust, 38 in bust**One body, read by three sizing methods.
Method	Result
Bra Atlas (measured band)	34D
Wacoal's calculator	36B
ThirdLove's calculator	36A (see the ThirdLove page)

Wacoal's 36B holds less cup volume than our 34D: five of our test runs on its calculator all follow one rule, band = underbust + 2 in (or +3 if odd), cup = bust minus that band. White and Scurr (2012) found that the traditional +4 method overestimated band size and underestimated cup size; they did not test this calculator. Our five results do not establish how a Wacoal bra will fit. Use the label as a starting point and check the fit.

Get your measured size All brand charts

By Rai Ansar · Sizes computed by the Bra Atlas engine · Sources and checked dates · How the sizes are calculated

We quote what its chart and calculator printed and say where that differs from a measured-band size; we don't claim Wacoal "runs small".

What Wacoal's own chart and calculator say

From Wacoal America's size charts and calculator, and Wacoal's international size guide.

What its calculator printed

Five of our tape measurements returned a size: 29/33 in gave 32A, 33/37 gave 36A, 34/38 gave 36B, 36/41 gave 38C and 38/44 gave 40D. Every one fits the same rule: band = underbust + 2 (or + 3 if odd), cup = bust minus that band, one letter per inch. 30/34 and 32/35 returned "Your overbust measurement should be larger than your underbust" in two runs, and 28/30 in one. The overbust was larger in each; we do not know why the calculator rejected them.

What its chart shows

Wacoal America's size chart page prints a US-to-UK ladder to US O = UK K in its Elomi, Freya and Fantasie section. Wacoal's own international guide pairs US DDD with UK E, US G with UK F and US H with UK FF, ending at US J = UK GG. Those pairings match our converter. Its AUS/NZ row keeps the UK letters, including FF and GG; our default Australian column follows Berlei instead.

Converting a Wacoal size

Wacoal's international guide pairs US AA to J with UK AA to GG. Wacoal America's Elomi, Freya and Fantasie section extends that ladder to US O. The table here stays within Wacoal's own international guide.

**Wacoal label to Bra Atlas UK**Engine-generated label pairings within the guide. Separate band and cup rows do not confirm that every combination is sold.
Band	AA	A	B	C	D	DD	DDD	G	H	I	J
32	32AA	32A	32B	32C	32D	32DD	32E	32F	32FF	32G	32GG
34	34AA	34A	34B	34C	34D	34DD	34E	34F	34FF	34G	34GG
36	36AA	36A	36B	36C	36D	36DD	36E	36F	36FF	36G	36GG
38	38AA	38A	38B	38C	38D	38DD	38E	38F	38FF	38G	38GG

Built from the same conversion engine as the rest of the site (src/lib/engine.ts); nothing here is typed by hand. A US 34DDD label, for example, reads 34E on our chart, EU 75F and France 90F. Use the converter for other labels. Its default AU column follows Berlei; Wacoal's own AUS/NZ row keeps UK FF and GG. Our JP column is approximate and stops at I, while Wacoal's guide continues to JP K.

Next steps

Sources

Each source was opened and checked on the date shown, or on 25 September 2026. Where sources disagree, the page says so instead of picking one silently.

Wacoal, "International Size Guide": UK AA to GG paired with US AA to J; AUS/NZ keeps FF and GG; band and cup rows are separate, not a stock list (opened 13 October 2026)
Wacoal America, "Size Charts": US and UK cup ladders for its Elomi, Freya and Fantasie bras (opened 25 September 2026)
Wacoal America, "Bra Fit Calculator": measurements in eighths of an inch; 8 synthetic pairs submitted to the calculator; 5 result pairs recorded (opened 25 September 2026)
White J, Scurr J. Evaluation of professional bra fitting criteria for bra selection and fitting in the UK. Ergonomics 2012;55(6):704-711: 45 women; the traditional method overestimated band and underestimated cup
Berlei Australia, size charts: AU band = underbust row, cups A to H with no FF or GG
Wikipedia, "Bra size": UK and US cup ladders, the +4 method, EN 13402 and JIS cup steps