Bra size charts by brand, read side by side

The brand charts we could read print the same cup letters up to DD, then split. Wacoal and Victoria's Secret print DDD next, SKIMS's size grid goes from DD straight to F, and Marks & Spencer and Freya use UK letters, where M&S skips the FF that Freya prints.

ThirdLove adds half cups, and SKIMS uses its own underband, overbust and cup-conversion tables, so a size from one brand may not carry over to another. Six brands, using the chart captures and calculator runs of 25 September 2026, plus Wacoal's international guide opened 13 October 2026. Compare the sizing methods before choosing a label.

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

We quote what each chart shows and say where a chart disagrees with others; we don't claim that any brand "runs small" or "runs big".

Cup letters after DD

These are the printed cup sequences, not a guarantee of matching fit. The highlighted letters come after DD; M&S also changes some earlier letters in its US conversion column.

Victoria's Secret (international chart)

Wacoal (US)

SKIMS (US)

Marks & Spencer (UK)

Freya (UK)

Victoria's Secret's international chart ends at DDD; its US size guide separately states cups A to O, with not every style in every size. ThirdLove's chart is an image we could not read as text; its guide says DD is the same as E and DDD the same as F. The international chart has the full ladders by country.

ThirdLove vs SKIMS: why the size can differ

Compare the sizing methods first. We have not wear-tested these bras, so this is not a comfort or quality ranking.

Check the brand's size chart

ThirdLove size chart SKIMS size chart

Use the UK to US converter for standard country labels once you have checked the brand's cup ladder. It does not convert ThirdLove half cups. SKIMS's cup table and measurement grid disagree above DD, so we do not convert a SKIMS F, G or H. Use SKIMS's measurement grid as a starting point and try it on.

**ThirdLove and SKIMS sizing, side by side**Brand charts and the recorded calculator runs of 25 September 2026.
Sizing question	ThirdLove	SKIMS
Measurement method	Its calculator takes underbust and bust in inches. In our recorded runs, the band was 2 in above an even underbust and 3 in above an odd one; we could not reproduce one cup rule.	Its chart uses underband and overbust. The displayed underband columns put the band 4 in above the measurement.
Half cups	Its official guide offers half cups between cup sizes. Our recorded 30 / 34 in input returned 32B½.	The published band-and-cup chart lists whole cup labels, with no half-cup entries.
Cup-label conversion	Its measuring guide says DD = E and DDD = F. Half cups have no exact label in our standard converter.	Its cup table pairs F with UK F, but its measurement grid puts F one step after DD, where other US ladders have DDD. The two charts disagree; a general conversion cannot resolve this.

For 34 in underbust and 38 in bust, our 25 September 2026 record shows ThirdLove 36A and SKIMS 38A. ThirdLove was a calculator result; SKIMS was read from its chart. These are the original records, not new calculator runs. See the full same-tape comparison and the detailed ThirdLove size chart.

Sources: ThirdLove's official size chart, ThirdLove's measuring guide and SKIMS's official size guide.

For an Australian sister size, open the sister-size finder in Australian labels, which starts with a 12D example, then enter your own AU size. Brand cup ladders can differ; check the brand's chart before ordering.

Same tape, four answers

We typed the same tape measurements into Wacoal's and ThirdLove's online calculators and read SKIMS's published chart. The band padding explains most of the spread.

**One body, several labels**Underbust and bust in inches. Bra Atlas in UK letters (measured band); the brands in their own US letters. A dash: not run, no size returned, or no single answer on the chart.
Tape	Bra Atlas	Wacoal calculator	ThirdLove calculator	SKIMS chart
29 / 33	30C/D	32A	–	–
30 / 34	30D	–	32B½	34A
32 / 35	32C	–	34AA	–
33 / 37	34C/D	36A	36A	–
34 / 38	34D	36B	36A	38A
36 / 41	36DD	38C	38A	–
38 / 44	38E	40D	not carried	–

Our read: Wacoal's five answers all follow one rule, underbust + 2 in (+3 if odd) for the band and one cup per inch above it. SKIMS's chart adds 4 in to the underband. Both give a bigger band and a smaller cup than the measured-band method, the pattern White and Scurr (2012) found with the traditional +4 method. Neither is "wrong" for its own bras: a brand sizes to its own cut. It means a size from one brand's tool does not carry over to another's. Runs recorded in a browser on 25 September 2026; the raw records are not publicly linked here.

Brand by brand

Each brand's measurement method, cup labels and chart caveats.

Victoria's Secret

Labels: US cup letters
Range: US guide: bands 30 to 46, cups A to O, not every style in every size; international chart: bands 30 to 44, cups AA to DDD
Band: Its UK quick guide says to round the snug underbust to the nearest even number, without adding inches. The calculator section on that page says to round an odd number down.

What its chart shows

Victoria's Secret sells US sizes. Its international chart puts a US 34DDD at UK 34E, EU 75F, France 90F and Australia 12E, and a US 34DD at UK 34DD and EU 75E. Every row of that chart, bands 30 to 44 and cups AA to DDD, matches our converter exactly.

The E and F on its labels

Its bralette charts print the cup rows as "DD (E)" and "DDD (F)". So a VS "E" is a US DD and a VS "F" is a US DDD: a UK E, not a UK F.

What we could not check

Its US online calculator did not accept scripted input when we tried it, so we have no recorded answers from it. The band rule above is from its UK page.

Convert a Victoria's Secret size like 34DDD · Victoria's Secret's own page

ThirdLove

Labels: US cup letters
Range: 32 to 44 bands, AA to H cups, plus half cups (for example 32B½)
Band: In our runs its calculator put the band 2 in above an even underbust and 3 in above an odd one.

What its calculator printed

We gave its bra size calculator six tape measurements. 30/34 in came back 32B½, 32/35 came back 34AA, 33/37 came back 36A, 34/38 came back 36A and 36/41 came back 38A; 38/44 returned "we don't currently carry your size". Our measured-band engine gives 30D, 32C, 34C/D, 34D, 36DD and 38E for the same pairs.

Its letters

ThirdLove's own measuring guide says a DD is the same as an E and a DDD is the same as an F. Its half cups sit between two letters, so a 34C½ has no exact label at another brand: try the letter above and below.

Reading it

The padded band is the older +4 idea in a milder form (+2 or +3). Its cups did not follow one subtraction rule we could reproduce from six pairs, so we publish what it printed and nothing more.

Full ThirdLove size chart, converted · Convert a ThirdLove size like 34DDD · ThirdLove's own page

Wacoal

Labels: US cup letters
Range: Its international guide gives bands 30 to 46 and cups US AA to J (UK AA to GG) separately; it does not confirm every combination. The US AA-to-O ladder on Wacoal America is for Elomi, Freya and Fantasie
Band: In our runs its calculator put the band 2 in above an even underbust and 3 in above an odd one, then took one cup per inch of difference.

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.

Full Wacoal size chart, converted · Convert a Wacoal size like 34DDD · Wacoal's own page

SKIMS

Labels: US cup letters
Range: 30AA to 46H for cup-sized styles; letter sizes XXS to 5X for wireless
Band: Its chart puts each underband 4 in higher: a 26 in underband sits in the 30 band, 28 in the 32 band, 34 in the 38 band.

What its chart shows

SKIMS sizes cup-sized bras from an underband and an overbust. On its chart a 30 in underband with a 34 in overbust reads 34A, and 34 in with 38 in reads 38A. For the same two bodies our measured-band engine gives 30D and 34D.

The missing DDD

Its grid runs DD, F, G, H with no DDD or E. On band 32 those labels sit at overbust readings of 36.5, 37.5, 38.5 and 39.5 in. Its cup table instead lists DDD = UK E, F = UK F, G = UK G and H = UK H / EU K. The two charts disagree above DD, so we do not convert a SKIMS F, G or H. Use its measurement grid for a starting size and try it on.

SKIMS's own page

Marks & Spencer

Labels: UK cup letters
Range: UK 28AA to 46K on its conversion table
Band: M&S calls a tape measurement "a rough starting point" and recommends a fitting with its lingerie stylists.

Its letters

The M&S conversion table runs DD, E, F, G, GG, H, J, K: no FF, HH or JJ, which most UK specialists (Freya, for one) use.

Its US column

On the M&S US size guide, bands 30 and 34 to 46 list the US size one cup letter below the UK size (UK 34C = US 34B, UK 36DD = US 36D), while bands 28 and 32 keep the same letters (UK 32C = US 32C). Wacoal, Freya and Victoria's Secret all print UK 34C = US 34C. If you shop M&S from the US, compare with the UK label.

Its fit advice

M&S: if the band rides up, you might need a smaller band size; if the straps are doing all the work, the band may be too big; spilling out means a bigger cup, gaping or creasing a smaller one; a center that lifts away means a bigger cup. Its sister-size example is the same as ours: 34C holds the same cup volume as 32D and 36B.

Convert a Marks & Spencer size like 34E · Marks & Spencer's own page

Freya

Labels: UK cup letters
Range: Bands 28 to 44 and cups B to K on its size chart; it states B to O across its ranges
Band: Its band table: UK 34 = EU 75 = France 90 = Australia 12 = US 34 = Japan 75.

What its chart shows

Freya prints one row per country. UK E is EU F and US DDD; UK F is EU G and US G; UK FF is EU H and US H; Japan runs one letter ahead of the EU. Its UK, EU, France, US and Japan rows match our converter cell for cell (our Japanese column stops at I).

Where it disagrees with us

Freya's Australian row keeps the UK letters, FF and GG included. Berlei's Australian chart skips FF and GG, and our converter follows Berlei, so for a UK FF we print AU G where Freya prints AU FF. Buying Freya in Australia, go by Freya's label.

Convert a Freya size like 34FF · Freya's own page

Not yet on this page: Bravissimo (its size guide address returned "page not found" on 25 September 2026); Panache (its size tables sit behind product pages we could not read as text). We add a brand only when we can read its own chart or run its own calculator.

Using a brand's chart

Start from your measured size. The calculator gives it, with the +4 result beside it so you can see how far a padded-band brand may move you.
Check the letters. A standard US DDD is a UK E. Victoria's Secret also prints it as "F", and ThirdLove says DDD equals F. Use the converter for standard country labels. SKIMS's two charts disagree above DD: use SKIMS's measurement grid and try the bra on rather than choosing a UK equivalent.
Band doesn't fit, cups do? Move to a sister size, one band and one letter the opposite way.
Already own one that feels wrong? The fit check turns what you notice into the next size.

Other tools

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.

Victoria's Secret Customer Care, "Size & Fit: International Size Chart (Outside the U.S.)": US sizes sold; bands 30 to 44, cups AA to DDD; US DDD = UK E (opened 25 September 2026)
Victoria's Secret Customer Care, "Size & Fit: Bras & Bralettes": US guide states bands 30 to 46 and cups A to O, not all styles in all sizes; bralette rows print DD (E) and DDD (F) (opened 25 September 2026)
Victoria's Secret UK, "Measure Your Bra Size": band = snug underbust rounded to the nearest even number; fit fixes; sister table (opened 25 September 2026)
ThirdLove, "Bra Size Calculator & Chart": bands 32 to 44, cups AA to H with half cups; 6 synthetic pairs submitted to the calculator; 5 result pairs recorded (opened 25 September 2026)
ThirdLove, "How To Measure Your Bra Size At Home": DD = E and DDD = F; half-cup sizes; do not round (opened 25 September 2026)
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)
SKIMS, "Bra Size Guide": underband/overbust grid and US/UK/EU/AU cup table disagree above DD; grid skips DDD (opened 25 September 2026)
Marks & Spencer, "How to Measure Bra Size": fit checks; sister sizing; a tape gives a rough starting point (opened 25 September 2026)
Marks & Spencer US, "Bras size guide": UK, AU/NZ, US/CA, EU and FR conversion table (opened 25 September 2026)
Freya, "International Bra Size Chart & Bra Sizing": band and cup tables in UK, EU, FR, AU/NZ, US and JP (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