How ThirdLove sizing works
ThirdLove uses us sizing (inch bands, us cup letters). Measure your snug underbust and standing bust as described in our fit guide, then read your size from the chart below. If you already know your size in another system, convert it first with our size converter.
Good to know: Offers half-cup sizes between standard cups.
Chart guide
| Band | Cup | |||||
|---|---|---|---|---|---|---|
| 32 | 32A | 32B | 32C | 32D | 32DD | 32DDD |
| 34 | 34A | 34B | 34C | 34D | 34DD | 34DDD |
| 36 | 36A | 36B | 36C | 36D | 36DD | 36DDD |
| 38 | 38A | 38B | 38C | 38D | 38DD | 38DDD |
Standard inch-based chart. Brands grade differently, so confirm on the official chart below.
Brand charts change over time. If anything here disagrees with the official chart linked above, the official chart wins. The outbound link is provided for reference.
Frequently asked questions
What size system does ThirdLove use?
ThirdLove uses us sizing (inch bands, us cup letters). Offers half-cup sizes between standard cups.
How do I convert my size to ThirdLove?
Measure your underbust and bust, get your size in your usual system with our calculator, then map it across with the size converter before checking the official ThirdLove chart.