Band
Cup
Get classic underwire nursing bra ease in our definitive T-shirt bra style. More hook-and-eye adjustability for size fluctuations. All-day (or all night!) comfort & support.
Thirdlove offers over 60 bra sizes from 32 to 44 band and bra cup sizes from AA to H cup, including our exclusive half cup sizes. Using your current bra size as a starting point, you can refer to the bra cup size chart below to refine your fit.
When using the chart to find your bra size, keep in mind:
Measure snugly around your rib cage (underbust) and around the fullest part of your bust, in inches. Step 1 gives your band. For step 2, subtract your underbust from your bust and find the difference in your band's column. These are the sizes our Bra Size Calculator gives.
| Underbust (in) | Band size |
|---|---|
| 24.9 – 28.5 | 30 |
| 28.5 – 30.5 | 32 |
| 30.5 – 32.5 | 34 |
| 32.5 – 34.5 | 36 |
| 34.5 – 36.5 | 38 |
| 36.5 – 38.5 | 40 |
| 38.5 – 40.5 | 42 |
| 40.5 – 42.5 | 44 |
| Bust − underbust (in) | Band 30 | Band 32 | Band 34 | Band 36 | Band 38 | Band 40 | Band 42 | Band 44 |
|---|---|---|---|---|---|---|---|---|
| Up to 2.5 | 34AA | |||||||
| 2.5 – 3 | 30B* | 32A* | 34AA* | |||||
| 3 – 3.5 | 30C | 32B | 34A | |||||
| 3.5 – 4 | 30C½ | 32B½ | 34A½ | |||||
| 4 – 4.5 | 30D | 32C | 34B | 36A* | ||||
| 4.5 – 5 | 30D | 32C½ | 34B½ | 36A½ | ||||
| 5 – 5.5 | 30E | 32D | 34C | 36B | 38A* | |||
| 5.5 – 6 | 30E½ | 32D½ | 34C½ | 36B½ | 38A½ | |||
| 6 – 6.5 | 30F | 32E | 34D | 36C | 38B | |||
| 6.5 – 7 | 30F | 32E½ | 34D½ | 36C½ | 38B½ | |||
| 7 – 8 | 30G | 32F | 34E | 36D | 38C | 40B* | ||
| 8 – 9 | 32G | 34F | 36E | 38D | 40C | 42B* | ||
| 9 – 10 | 34G | 36F | 38E | 40D | 42C | 44B* | ||
| 10 – 11 | 34H | 36G | 38F | 40E | 42D | 44C | ||
| 11 – 12 | 36H | 38G | 40F | 42E | 44D | |||
| 12 – 13 | 38H | 40G | 42F | 44E |
* Also the result when the difference is exactly 2.5 in: 30B, 32A, 34AA; 4 in: 36A; 5 in: 38A; 7 in: 40B; 8 in: 42B; 9 in: 44B.
The calculator only gives a size for an underbust over 24.9 in, up to 42.5 in, with a difference of up to 13 in. Blank cells and measurements outside these ranges have no size in the calculator.
Perfect fit promise: Exchanges free for 60 days for all eligible orders. Please try on the bra to ensure a good fit, making sure to leave the original tags attached. We only accept underwear in unworn condition, with original tags, in its unopened original polybag. Items marked final sale are not eligible for return or exchange. If something’s not right, we can help. Our Fit Experts are available via live chat, or email to answer any questions you might have.
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