ThirdLove Bra Size Chart
Enter your measurements for your exact ThirdLove size — then convert to UK, EU & AU.
Your ThirdLove size
Size chart — US · UK · EU · AU
Data verified Apr 2026 · Official size guide · See an error? Report it
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What is the ThirdLove sister size for 32B?
The ThirdLove sister sizes for 32B are 30C (snugger band, same cup volume) and 34A (looser band, same cup volume). ThirdLove also offers half-cup sizes (32A½, 32B½) between standard cups, so if 32B feels slightly big and 30C is too snug, try 32A½ or 32B½ — half-cups are unique to ThirdLove among major brands.
- Starting size
- 32B
- Snugger band, same volume
- 30C
- Looser band, same volume
- 34A
- Half-cup options
- 32A½, 32B½
ThirdLove Size Equivalents
Common ThirdLove bra sizes converted to UK, EU, and AU — plus the sister sizes to try if the band feels off.
| US | UK | EU | AU | Sister sizes |
|---|---|---|---|---|
| 32C | 32C | 70C | 10C | 30D, 34B |
| 34B | 34B | 75B | 12B | 32C, 36A |
| 34C | 34C | 75C | 12C | 32D, 36B |
| 34D | 34D | 75D | 12D | 32DD, 36C |
| 36C | 36C | 80C | 14C | 34D, 38B |
| 36D | 36D | 80D | 14D | 34DD, 38C |
Need a different size? Use the full ThirdLove size chart above or the calculator for your exact measurements.
How ThirdLove Sizing Compares
If you wear a 34C in ThirdLove, here's your likely size in other popular brands:
| Brand | US Size | UK Size | EU Size | Fit |
|---|---|---|---|---|
| ThirdLove | 34C | 34C | 75C | true to size |
| Victoria's Secret | 34C | 34C | 75C | true to size |
| Calvin Klein | 34C | 34C | 75C | true to size |
| Savage x Fenty | 34C | 34C | 75C | true to size |
| Wacoal | 34C | 34C | 75C | true to size |
| Aerie | 34C | 34C | 75C | true to size |
Sizes shown use standard charts. Actual fit may vary by style — always check the brand's specific size guide.
ThirdLove Sizing & Fit Guide
ThirdLove is known for their half-cup sizes (e.g., 34.5B) which provide a more precise fit between standard cup sizes. Their bras tend to run true to size with a focus on comfort.
ThirdLove Half-Cup Sizes Explained
ThirdLove is the only major bra brand offering half-cup sizes, designed for women who fall between standard cup sizes. If a 34B feels slightly too small but a 34C has gaps at the top, ThirdLove's 34B½ bridges that gap. Half-cup sizes are available across most of their range and in their most popular styles including the 24/7 Classic T-Shirt Bra and Fit Finder Bra. This precision sizing means fewer women need to compromise on fit — ThirdLove estimates that nearly half of women wear a half-cup size.
How ThirdLove Sizing Compares to Other Brands
ThirdLove uses standard US bra sizing for band and cup, so a 34C in ThirdLove is the same starting point as a 34C in Victoria's Secret, Calvin Klein, or any other US brand. Where ThirdLove differs is range and precision: they go up to 48H (wider than most brands) and offer half-cups between every whole size. Their bras also have more consistent sizing across styles — unlike brands where a push-up 34C fits differently from a T-shirt bra 34C, ThirdLove designs all styles to fit the same within a given size.
ThirdLove Size Range and Inclusivity
ThirdLove offers one of the widest size ranges of any direct-to-consumer bra brand: bands from 30 to 48 and cups from A through H, plus half-cup sizes throughout. This covers an estimated 80+ unique sizes when including half-cups. By comparison, Victoria's Secret tops out around 40DDD and Calvin Klein at 38DD. If you're outside the range of most mainstream brands, ThirdLove is worth trying — particularly for cup sizes above DD or band sizes above 40.