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ThirdLove bra sizes: chart, conversions and sister sizes
ThirdLove labels its bras in US sizes. Here is the size range recorded in the Cherry Size catalogue, its equivalents in EU, FR, UK and JP sizing, and the closest sister size when a size falls outside that range.
- Label system
- US sizese.g. 34C
- Bands
- 30–48EU/JP 65–110 · FR 80–125
- Largest cup
- HEU/FR/JP H · UK FF
What to know about ThirdLove labels
ThirdLove sells many of its bras in half cup sizes as well as whole ones, and suggests a size through Fit Finder, the online fit quiz on its website; the questions below show where both stand in these tables.
How US sizes work
A US size is a band number and a cup letter. The band is an inch-based label (30, 32, 34…) shared with UK sizes. After D, most US brands go DD, DDD, G, H, I, J (some write DDDD for G, and a US G is a UK F), where UK cups go DD, E, F, FF, G, GG, H, HH, J. EU and French sizes number the band differently: a US 34 band is 75 in EU sizes and 90 in French sizes.
The ThirdLove size range
In the Cherry Size catalogue: bands 30–48 (US) and cups up to H. The tables start at cup A. A given style can come in fewer sizes: check its product page.
| US/UK | EU/JP | FR | Underbust (cm) | Underbust (in) |
|---|---|---|---|---|
| 30 | 65 | 80 | 62.5–67.5 | 24.6–26.6 |
| 32 | 70 | 85 | 67.5–72.5 | 26.6–28.5 |
| 34 | 75 | 90 | 72.5–77.5 | 28.5–30.5 |
| 36 | 80 | 95 | 77.5–82.5 | 30.5–32.5 |
| 38 | 85 | 100 | 82.5–87.5 | 32.5–34.4 |
| 40 | 90 | 105 | 87.5–92.5 | 34.4–36.4 |
| 42 | 95 | 110 | 92.5–97.5 | 36.4–38.4 |
| 44 | 100 | 115 | 97.5–102.5 | 38.4–40.4 |
| 46 | 105 | 120 | 102.5–107.5 | 40.4–42.3 |
| 48 | 110 | 125 | 107.5–112.5 | 42.3–44.3 |
| US | EU/FR/JP | UK | Bust − underbust (cm) | Bust − underbust (in) |
|---|---|---|---|---|
| A | A | A | 8.75–11.25 | 3.4–4.4 |
| B | B | B | 11.25–13.75 | 4.4–5.4 |
| C | C | C | 13.75–16.25 | 5.4–6.4 |
| D | D | D | 16.25–18.75 | 6.4–7.4 |
| DD | E | DD | 18.75–21.25 | 7.4–8.4 |
| DDD | F | E | 21.25–23.75 | 8.4–9.4 |
| G | G | F | 23.75–26.25 | 9.4–10.3 |
| H | H | FF | 26.25–28.75 | 10.3–11.3 |
Common ThirdLove sizes in other systems
| US | EU | FR | UK | JP |
|---|---|---|---|---|
| 32A | 70A | 85A | 32A | A70 |
| 32B | 70B | 85B | 32B | B70 |
| 32C | 70C | 85C | 32C | C70 |
| 32D | 70D | 85D | 32D | D70 |
| 32DD | 70E | 85E | 32DD | E70 |
| 32DDD | 70F | 85F | 32E | F70 |
| 34A | 75A | 90A | 34A | A75 |
| 34B | 75B | 90B | 34B | B75 |
| 34C | 75C | 90C | 34C | C75 |
| 34D | 75D | 90D | 34D | D75 |
| 34DD | 75E | 90E | 34DD | E75 |
| 34DDD | 75F | 90F | 34E | F75 |
| 36A | 80A | 95A | 36A | A80 |
| 36B | 80B | 95B | 36B | B80 |
| 36C | 80C | 95C | 36C | C80 |
| 36D | 80D | 95D | 36D | D80 |
| 36DD | 80E | 95E | 36DD | E80 |
| 36DDD | 80F | 95F | 36E | F80 |
| 38A | 85A | 100A | 38A | A85 |
| 38B | 85B | 100B | 38B | B85 |
| 38C | 85C | 100C | 38C | C85 |
| 38D | 85D | 100D | 38D | D85 |
| 38DD | 85E | 100E | 38DD | E85 |
| 38DDD | 85F | 100F | 38E | F85 |
Estimates from standard size tables; a given style can differ. UK and US band numbers are labels, not your underbust in inches.
Sizes outside the ThirdLove range in our catalogue: the closest sister size
A sister size keeps about the same cup volume on another band. For a size just outside the range recorded for ThirdLove, here is the sister size inside it.
| Size (US) | Sister size in the range | Change |
|---|---|---|
| 32I | 34H | one band up, one cup down |
| 34I | 36H | one band up, one cup down |
| 36I | 38H | one band up, one cup down |
| 38I | 40H | one band up, one cup down |
| 28B | 30A | one band up, one cup down |
| 28C | 30B | one band up, one cup down |
| 28D | 30C | one band up, one cup down |
ThirdLove sizes: your questions
Is there a ThirdLove bra size calculator?
The free Cherry Size calculator works with ThirdLove sizes: measure your underbust (snug and level, right under the bust) and your bust (at the fullest point), and it turns these two numbers into a size estimate in US sizes and the other main systems; the tables above then give the US label to look for at ThirdLove.
What does the ThirdLove bra size chart cover?
ThirdLove sizes are US sizes: bands 30–48 and cups up to H in the range recorded in our catalogue. The tables above give each of them in EU, FR, UK and JP sizing; for example, a 34C from ThirdLove is EU 75C, FR 90C, UK 34C and JP C75.
Is there a ThirdLove bra size quiz?
Yes: ThirdLove has an online fit quiz, Fit Finder, on its website. To check a size against the standard tables, measure your underbust and your bust with a soft tape, enter both numbers in the free Cherry Size calculator, and find the result as a US size in the tables above; then place a half size between the two whole cups around it.
How do ThirdLove half sizes fit in these tables?
Half cup sizes fall between two whole cups. Our tables convert whole cups only, so a half size has no row of its own: it sits between the two neighbouring rows of the cup table above.
How does the ThirdLove sister size chart work?
Sister sizes keep about the same cup volume on another band: one band down and one cup up, or one band up and one cup down. For a 34C from ThirdLove, they are 32D and 36B. For sizes just outside the range, the sister-size table above gives the closest one inside it.
Which measurements do you need for a ThirdLove bra size?
Two measurements decide the size: the underbust gives the band, and the difference between bust and underbust gives the cup. In Cherry Size's conversion tables (not the brand's own chart), a 34C corresponds to an underbust of about 72.5–77.5 cm and a bust of about 86–94 cm; the brand's guide may place it differently. The band and cup tables above give these ranges for every size in the range.
Where to find the ThirdLove size guide
ThirdLove publishes its own size guide on its website; we don't link to it here. Each product page lists the sizes of its style.
Don't know your size yet?
Measure your underbust and bust with a soft tape: the calculator turns them into a size estimate in every system, and the guide shows how to measure in two minutes.
Open the calculator →How to measure
Want your size at ThirdLove from your own measurements? Get Cherry Size. In the app, your size is free, and so is your size at 3 brands you choose. Every brand, the fitting room, the wardrobe and the journal need a subscription, with a free trial for eligible new subscribers.
Get the appCherry Size is not affiliated with ThirdLove; brand names are used for information only. Size range: Cherry Size catalogue. Conversions: Cherry Size size tables.