Bra Atlas fitting card
34CUK · same in the US
Measures about 34 in underbust and 37 in bust. Same cups as 32D and 36B.
- UK
- 34C
- US
- 34C
- EU
- 75C
- FR
- 90C
- AU
- 12C
- JP
- D75
Same cups 32D·34C·36B
34C sister size chart, conversions and measurements
Marks & Spencer and Victoria's Secret UK both use 34C to explain sister sizing: it holds the same cup volume as 32D and 36B. On M&S's US chart, though, a UK 34C is printed as US 34B.
Every sister of 34C
- 30DDTighter band by 4 in, 2 cup letters up (US 30DD, EU 65E)
- 32DTighter band by 2 in, 1 cup letter up (US 32D, EU 70D)
- 34CThis size (US 34C, EU 75C)
- 36BLooser band by 2 in, 1 cup letter down (US 36B, EU 80B)
- 38ALooser band by 4 in, 2 cup letters down (US 38A, EU 85A)
32D
tighter band
34C
your size
36B
looser band
Same cups, three bands: 32D, 34C, 36B hold the same cup volume.
Tape measurements that give 34C
Computed by the Bra Atlas engine with the measured-band method, and checked by running each pair back through it.
| Snug underbust | Fullest bust | Result |
|---|---|---|
| 33 in (84 cm) | 36.5 in (93 cm) | 34C |
| 33.5 in (85 cm) | 36.75 in (93 cm) | 34C |
| 34 in (86 cm) | 37 in (94 cm) | 34C |
| 34.5 in (88 cm) | 37.25 in (95 cm) | 34C |
Our +4 comparison gives 38AA for 34 in underbust and 37 in bust. With an odd 33 in underbust and a 36 in bust we print 34B/C; our fixture-backed model of calculator.net's unpadded row gives 34C. How the +4 and measured-band methods work.
What is particular about 34C
The example brands use
Marks & Spencer and Victoria's Secret UK both explain sister sizes with 34C: the same cup volume as 32D and 36B. Our chart draws the same line, and on to 30DD and 38A.
M&S's US chart calls it 34B
On the Marks & Spencer US size guide, a UK 34C is listed as US 34B (bands 30 and 34 to 46 shift one letter; 28 and 32 do not). Wacoal, Freya and Victoria's Secret all print UK 34C = US 34C, and so do we. Shopping M&S from the US, go by the UK label.
What the +4 method does to this body
A 34 in underbust and a 37 in bust measure 34C. Our +4 comparison pads the band to 38, leaving 37 − 38 = −1 in. Using AA for a difference below 1 in gives 38AA: one sister-size volume step smaller than 34C, on a band 4 in longer.
34C in every system
| UK | US | EU | FR | AU | JP (approx.) |
|---|---|---|---|---|---|
| 30DD | 30DD | 65E | 80E | 8DD | F65 |
| 32D | 32D | 70D | 85D | 10D | E70 |
| 34C | 34C | 75C | 90C | 12C | D75 |
| 36B | 36B | 80B | 95B | 14B | C80 |
| 38A | 38A | 85A | 100A | 16A | B85 |
Other sizes and tools
- Bra size calculatorCheck that 34C is still your size, with both methods shown
- Sister size chartThe full diagonal chart and fit fixes
- Fit checkTick what feels wrong in your 34C; get the size to try next
- Brand size chartsHow Victoria's Secret, ThirdLove, Wacoal, SKIMS, M&S and Freya size charts differ
- 34BSame 34 band, 1 cup letter down
- 34DSame 34 band, 1 cup letter up
- 34DDSame 34 band, 2 cup letters up
- 36CSame cup letter on a 36 band
- 32DDSame cup volume as 34C, on a tighter band
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.
- 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)
- 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)
- Wikipedia, "Bra size": UK and US cup ladders, the +4 method, EN 13402 and JIS cup steps
- 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)
- 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)