How does ThirdLove bra sizing run?
ThirdLove is labelled in US sizing, carrying cups A–H. Half-cup sizes nail the in-between fit. Below is how a ThirdLove size translates across all eight regional standards, plus sister sizes and where to buy.
ThirdLove size range & system
ThirdLove sizes in US, with cups A–H. Known for everyday, tshirt.
ThirdLove size conversion chart
Each row is one ThirdLove cup size read across the eight standards. The US column (highlighted) is how ThirdLove labels its bras.
| US | UK | EU | FR | IT | AU | JP | IN |
|---|---|---|---|---|---|---|---|
| A | A | A | A | A | A | A | A |
| B | B | B | B | B | B | B | B |
| C | C | C | C | C | C | C | C |
| D | D | D | D | D | D | D | D |
| DD | DD | E | E | E | DD | E | DD |
| DDD | E | F | F | F | E | F | E |
| G | F | G | G | G | F | G | F |
| H | FF | H | H | H | FF | H | FF |
Band conversions are exact; cup fit still varies by brand, style, and body — a conversion is a starting point, not a guarantee.
Common ThirdLove sizes
Open the full eight-standard conversion for a specific size:
Sister sizes in ThirdLove
If a ThirdLove bra fits in the cup but the band is off, your sister size keeps the same cup volume with a different band — go down a band and up a cup, or up a band and down a cup. Example: a 34D and a 32DD hold the same cup volume.
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Find your size in ThirdLove →Where to buy ThirdLove
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ThirdLove sizing FAQ
- Does ThirdLove run true to size?
- Half-cup sizes. True to size. Half-cups great for in-between.
- What sizing system does ThirdLove use?
- ThirdLove is labelled in US sizing, with cups from A to H. Use the conversion table above to read your size across US, UK, EU, FR, IT, AU, JP and IN.
- What is a 34D in ThirdLove in EU sizing?
- A US 34D converts to EU 75D. Band conversions are exact; cup fit still varies by brand, style, and body — a conversion is a starting point, not a guarantee.