C Cup Bra Size Chart: 32C–42C / 70C–90C Explained
A C cup size chart helps you compare C cup bras across band sizes, such as 32C/70C to 42C. It shows that 34C, 36C, 38C and 40C share the same cup letter but not the same cup volume, so always check the brand’s own size guide.
What does a C cup size chart show?
A C cup size chart shows how the same C cup letter changes across different band sizes.
C cup does not mean one fixed cup volume. A 34C cup bra, 36C cup bra, 38C cup bra and 40C cup bra all use the C letter, but each size is scaled to its band.
In many Asian or EU-style charts used by SG/MY shoppers, 70C, 75C, 80C, 85C and 90C are common cm-based equivalents for C cup bra sizes.
C Cup Bra Size Chart: 32C to 42C
This C cup bra size chart compares 32C to 42C with common cm-based labels, sister sizes and practical fit notes.
Use it as a quick overview, not a final fitting rule. Brand sizing can vary by pattern, fabric stretch and cup shape, so the brand’s own size guide should always be your final reference.
| Bra Size | Common cm Equivalent | Band Meaning | Cup Meaning | Sister Sizes | Fit Notes |
|---|---|---|---|---|---|
| 32C | 70C | Smaller band size | C cup volume scaled to 32 band | 30D / 34B | Good to check if the band feels snug but not tight. |
| 34C | 75C | Medium-small band size | C cup volume scaled to 34 band | 32D / 36B | 34C is not the same cup volume as 36C. |
| 36C | 80C | Medium band size | C cup volume scaled to 36 band | 34D / 38B | 36C usually has more cup volume than 34C. |
| 38C | 85C | Fuller band size | C cup volume scaled to 38 band | 36D / 40B | Check band support so the straps do not carry too much weight. |
| 40C | 90C | Larger band size | C cup volume scaled to 40 band | 38D / 42B | 40C is not the same as 34C or 36C in cup volume. |
| 42C | 95C in some charts | Extended larger band size | C cup volume scaled to 42 band | 40D / 44B | Check the brand chart carefully because 95C availability may vary. |
Gentle note before reading the chart
A bra size chart is a fitting tool, not a body label.
The most helpful size is the one that lets the band sit steady, the cups lie smoothly and your day feel easier. C cup, B cup or D cup are simply measurement names.
70C, 75C, 80C, 85C and 90C: what do they mean?
70C, 75C, 80C, 85C and 90C are common cm-based C cup labels used in many Asian and EU-style size charts.
The number usually refers to the underbust band category in centimetres, while C refers to the cup letter. These labels often match common inch-based sizes like this:
- 70C: often compared with 32C.
- 75C: often compared with 34C.
- 80C: often compared with 36C.
- 85C: often compared with 38C.
- 90C: often compared with 40C.
Because size conversion can vary, it is best to compare your underbust and bust measurements with the specific brand chart.
Is 34C the same as 75C?
34C is commonly treated as the equivalent of 75C in many SG/MY and Asian size charts.
They usually describe a similar band and cup category, just written in different sizing systems. However, “equivalent” does not always mean the fit will feel identical across brands.
Before choosing a 34C cup bra or 75C bra, check the product’s underbust range, bust range and return policy if available.
Is 36C bigger than 34C?
36C is usually bigger than 34C because both the band and the C cup volume increase with the band size.
This is a common point of confusion. The letter C stays the same, but it is not the same physical cup volume on every band.
| Comparison | What Changes | Simple Meaning |
|---|---|---|
| 34C vs 36C | Band and cup volume | 36C is generally larger than 34C. |
| 36C vs 38C | Band and cup volume | 38C is generally larger than 36C. |
| 38C vs 40C | Band and cup volume | 40C is generally larger than 38C. |
Why C cup changes with band size
C cup changes with band size because bra cup volume is proportional to the band, not fixed by the letter alone.
Think of a bra size as two linked parts. The number gives the base size around the body, and the cup letter is scaled from that base. This is why sister sizes can hold a similar cup volume while using different band and cup letters.
- 34C sister sizes: 32D and 36B.
- 36C sister sizes: 34D and 38B.
- 38C sister sizes: 36D and 40B.
- 40C sister sizes: 38D and 42B.
How to use this chart before buying a bra
Use this chart before buying a bra by checking your band first, then your bust difference, then the brand’s own size guide.
- Measure your underbust: wrap the tape around your ribcage under the bust.
- Measure your bust: measure around the fullest part of the bust without pulling tightly.
- Compare both numbers: use the brand’s chart to find your band and cup.
- Check sister sizes: try a sister size only if the band or cup feels close but not quite right.
- Review the style: seamless, wireless and soft daily bras may fit differently from structured styles.
Soft C cup support for everyday outfits
After checking your C cup size, a seamless or wireless bra can help the cups sit smoothly while keeping the band gentle for long-day wear.
Current offer note: please check each collection page for available campaign details, styles and prices.
Explore soft daily comfortComfortable bra options after checking your C cup size
Once your size range feels clearer, choose by comfort, smoothness and daily support rather than cup letter alone.
Seamless Bra
Smooth invisible fit for fitted tops and easy daily outfits.
Smooth fit Soft support Everyday wear Price: see current collection page Explore seamless comfortWireless / Bralette
Gentle, pressure-light support for long-day comfort.
Wireless comfort Breathable Easy fit Price: see current collection page Explore wireless comfortFAQ
Q1: What is C cup size in cm?
A: In many SG/MY and Asian-style charts, C cup often means the bust is about 16–18 cm larger than the underbust, but each brand may set its own measurement range.
Q2: Is 34C the same as 75C?
A: Yes, 34C is commonly treated as the equivalent of 75C in many size charts, but the final fit can vary by brand and bra style.
Q3: Is 36C the same as 80C?
A: Yes, 36C is commonly treated as the equivalent of 80C in many SG/MY and Asian or EU-style bra size charts.
Q4: Is 38C the same as 85C?
A: Yes, 38C is commonly treated as the equivalent of 85C in many conversion charts, though brand sizing may vary.
Q5: Is 40C the same as 90C?
A: Yes, 40C is commonly treated as the equivalent of 90C in many cm-based charts, but you should still check the brand’s own size guide.
Q6: Does C cup look the same on every band?
A: No, C cup does not look or fit the same on every band. 34C, 36C, 38C and 40C share the same cup letter but not the same cup volume.
