G Cup Bra Size Chart: 28G–40G / 60G–90G Explained
A G cup size chart helps you compare G cup across band sizes such as 28G to 40G or 60G to 90G. These sizes share the G cup letter but not the same cup volume, so the chart helps explain band meaning, cup relationship, sister sizes and fit notes.
What does a G cup size chart show?
A G cup size chart shows how the G cup letter changes across different band sizes.
G cup is not one fixed breast size. A 28G, 32G, 34G, 36G, 38G and 40G share the same cup letter, but they do not have the same cup volume because cup volume changes with band size.
- G cup changes with band size, so cup letter alone is not enough.
- 60G, 70G, 75G, 80G, 85G and 90G are common cm-based equivalents in many Asian or EU-style charts.
- Brand sizing can vary, so users should check the brand’s own size guide before buying.
- GG cup may appear in some UK-style charts, so always check whether the brand uses G, GG or another naming order.
G Cup Bra Size Chart: 28G to 40G
The G cup bra size chart below compares 28G to 40G with common cm-based equivalents, sister sizes and fit notes.
Use this table as a naming and comparison guide. It is not a final fit result, because fabric, cup shape, brand sizing and support design can all change how the same label feels.
| Bra Size | Common CM Equivalent | Band Meaning | Cup Meaning | Sister Sizes | Fit Notes |
|---|---|---|---|---|---|
| 28G | 60G | Very small band size | G cup volume on a 28 band | 26GG / 30FF | Often needs a secure, stable band because the frame is small. |
| 32G | 70G | Small-to-medium band size | G cup volume on a 32 band | 30GG / 34FF | Often searched as 32g bra size, 32 g cup bra or cup size 32g. |
| 34G | 75G | Medium band size | G cup volume on a 34 band | 32GG / 36FF | More cup volume than 32G because the band is larger. |
| 36G | 80G | Medium-to-larger band size | G cup volume on a 36 band | 34GG / 38FF | Often searched as 36 g cup, 36 g cup bra or 36 g cup size. |
| 38G | 85G | Larger band size | G cup volume on a 38 band | 36GG / 40FF | More cup volume than 36G; check cup depth and strap comfort. |
| 40G | 90G | Larger band size | G cup volume on a 40 band | 38GG / 42FF | More cup volume than 38G, 36G, 34G, 32G and 28G. |
60G, 70G, 75G, 80G, 85G and 90G: what do they mean?
60G, 70G, 75G, 80G, 85G and 90G are common cm-based ways to write G cup bra sizes.
In many Asian or EU-style charts, the number refers to the band system, while the letter still refers to the cup. This is why 70G is commonly matched with 32G, and 75G is commonly matched with 34G.
| CM-Based Size | Common Inch-Based Match | How to Read It |
|---|---|---|
| 60G | 28G | G cup on a smaller 60 band |
| 70G | 32G | G cup on a 70 band |
| 75G | 34G | G cup on a 75 band |
| 80G | 36G | G cup on an 80 band |
| 85G | 38G | G cup on an 85 band |
| 90G | 40G | G cup on a 90 band |
Is 32G the same as 70G?
32G is commonly shown as 70G in many SG/MY and Asian-style bra size charts.
They are usually two naming systems for the same band-and-cup position. Still, the final fit can vary by brand, bra type, cup depth and fabric stretch, so 32G / 70G should always be checked against the product’s own size guide.
Is 34G bigger than 32G?
34G is usually bigger in cup volume than 32G because the same G cup letter changes with band size.
Both sizes use the G cup letter, but 34G sits on a larger band. This usually gives 34G more overall cup volume than 32G. However, 34FF and 32G may be sister-size neighbours in some charts, depending on the country and brand.
| Comparison | Band | Cup Volume | Simple Answer |
|---|---|---|---|
| 32G / 70G | Smaller than 34G | Less cup volume than 34G | Usually smaller than 34G |
| 34G / 75G | Larger than 32G | More cup volume than 32G | Usually bigger than 32G |
What is G cup size in cm?
G cup size in cm depends on the band size and the brand’s own size chart.
For SG/MY shoppers, G cup may appear as 60G, 70G, 75G, 80G, 85G or 90G in many Asian or EU-style charts. These labels describe the band system plus the G cup letter, not one fixed breast measurement.
- 60G is commonly matched with 28G.
- 70G is commonly matched with 32G.
- 75G is commonly matched with 34G.
- 80G is commonly matched with 36G.
- 85G is commonly matched with 38G.
- 90G is commonly matched with 40G.
Why G cup changes with band size
G cup changes with band size because bra cups are scaled to the band measurement.
The cup letter tells you the bust-to-band relationship, but the band number sets the frame of the bra. When the band gets larger, the cup volume attached to the same letter also becomes larger.
- A 28G has less cup volume than a 32G.
- A 32G has less cup volume than a 34G.
- A 34G has less cup volume than a 36G.
- A 36G has less cup volume than a 38G.
- A 38G has less cup volume than a 40G.
- All six sizes share the G cup letter, but they do not look or fit the same.
How to use this chart before buying a bra
Use this G cup chart as a first check, then confirm your exact band and cup on the brand’s own size guide before buying.
A chart helps translate labels such as 32G and 70G, but it cannot replace fit checking. Bra style, cup depth, fabric stretch and coverage can all change how the same size feels.
- Find your current size in the chart, such as 32G / 70G or 34G / 75G.
- Check the product’s size range to confirm whether it covers your exact band and G cup or GG cup.
- Compare sister sizes carefully only if the band feels too tight or too loose.
- Read the product’s own size guide because brand sizing can vary.
- Choose by fit signs such as smooth cups, stable band and comfortable straps.
Size-check support options after reading the G cup chart
For G cup daily wear, start with the size chart first. Anti-sagging and minimizer styles may support different comfort needs, but always confirm whether the specific product covers your exact G cup or GG cup band size before choosing.
Product recommendation module: light options to compare after checking your G cup size
This page is mainly a size chart, so the product cards are only gentle next steps. Before choosing, confirm the product’s live size range and make sure it covers your exact G cup or GG cup size.
VEIMIA Lifted Anti-sagging Bra With Rounded Bust Shape
Scene / Use Case: Size-Check Support
Anti-sagging Bra Daily support Check G / GG coverage Shop Now
VEIMIA Sleek Minimizing Bra With High Side Coverage
Scene / Use Case: Fuller Coverage
Minimizer Bra High side coverage Check G / GG coverage Shop NowFAQ About G Cup Bra Size Chart
Q1: What is G cup size in cm?
A: In many Asian or EU-style charts, G cup may appear with cm-based band sizes such as 60G, 70G, 75G, 80G, 85G or 90G. The final fit still depends on the brand’s own size guide.
Q2: Is 32G the same as 70G?
A: Yes, 32G is commonly shown as 70G in many SG/MY size charts. Always check the brand’s own chart because sizing can vary.
Q3: Is 34G the same as 75G?
A: Yes, 34G is commonly shown as 75G in many Asian or EU-style size charts. Fit may still vary by brand and bra style.
Q4: Is 40G the same as 90G?
A: Yes, 40G is commonly shown as 90G in many cm-based charts. Check whether the product you want carries 40G / 90G before buying.
Q5: Does G cup look the same on every band?
A: No, G cup does not look or fit the same on every band. 28G, 32G, 34G, 36G, 38G and 40G share the G cup letter but not the same cup volume.
Q6: Is GG cup bigger than G cup?
A: In many UK-style charts, GG cup is bigger than G cup on the same band. Not every brand uses GG, so check the brand’s own cup order before comparing.
