N cup is an extremely rare size, well beyond what most mainstream or even specialty retailers stock as standard — if this is genuinely your size, made-to-measure or specialist full-bust brands are typically the only realistic route.
Common N cup sizes
| Size | Sister size (band up) | Sister size (band down) |
|---|---|---|
| 30N | 32M | 28O |
| 32N | 34M | 30O |
| 34N | 36M | 32O |
| 36N | 38M | 34O |
| 38N | 40M | 36O |
| 40N | 42M | 38O |
Sister sizing
The same sister-sizing logic still applies this far up the scale, though very few brands carry enough adjacent sizes to make the comparison practical. Use the sister size calculator to find your full chain.
Fit tips
Double-check your measurement
A size this far up the scale is worth re-measuring carefully, since a small measuring error has a large effect at this end of the range.
Made-to-measure is common
At this size, custom or made-to-measure options are often more realistic than off-the-shelf shopping.
Questions
N cup FAQs
It exists in sizing charts, but it's exceptionally rare in practice — most people searching for it are comparing scale rather than shopping for their own size.
Yes — it\'s worth re-measuring carefully and trying the bra size calculator again, since measuring errors have an outsized effect this far up the scale.
Also useful