The band should feel secure without digging in; cups and straps should feel comfortable as you move.
Warner's · United States / conventional bras
Warner's bra size calculator
Enter your measurements once and find the size you should actually try in the brands you shop. Compare US, UK and EU labels and see the nearby sizes.
- Brand-aware sizing
- US / UK / EU
- No account required
How the Warner's guide works
Looks up your underbust and bust measurements in the manufacturer’s published body-chart cells. Missing cells, gaps and overlapping matches are preserved rather than replaced with a guessed size.
- Region and system
- United States / conventional bras · US
- Data reviewed
- 2026-10-07
- Band labels covered
- 34, 36, 38, 40, 42, 44
- Cup labels covered
- B, C, D, DD, DDD
Bands are garment labels, not body ranges. Some combinations may be missing from this chart, and chart coverage is not a stock check.
Source scope and chart notes
Step #1 instructs rounding underbust and fullest bust to the nearest inch. Uses the linked Step #2 image exactly, including underbust overlaps at 35, 37 and 39 inches and blank cup cells. Both published matches remain visible. No alpha chart or inferred plus-four rule is substituted.
| Underbust | Bust | Label |
|---|---|---|
| 29–30 in | 36–36 in | 34B |
| 33–35 in | 41–41 in | 38C |
| 35–37 in | 46–46 in | 40DDD |
| 39–41 in | 49–49 in | 44DD |
These are a few sample rows. Ranges can overlap in the official chart, and the calculator keeps those overlaps.
Let’s find your starting point
Measure over a t-shirt or a lightly lined bra, or without one—whichever feels right.
A note on fit
A number can guide you. Your comfort gets the final say.
Bra sizing isn’t consistent from one label—or even one style—to the next. Think of this as a useful first try, not a rule you have to fit.
If your first try is close but not quite right, compare neighboring sizes and another style or cut.
Brands use different patterns, fabrics, and size ranges. A mismatch says more about the garment than about you.