UK Bra Size to US Conversion Guide
Translate UK double-letter cups into US lettering and confirm band equivalents so you can shop American brands without losing your fit.
Covers UK bands 28–52 with cups AA through KK and the matching US labels.
Bands share the same inch numbers
Keep your 32, 34, 36 band—the difference is mainly in the cup lettering.
Double letters collapse in the US
UK E becomes US DDD/F, FF maps to US H, and GG becomes US J.
Check the brand's home market
US brands may already print the US letter alongside UK sizing—use the US column when available.
UK to US cup letter conversion
Follow your UK cup across to find the nearest US equivalent when you’re shopping American labels.
| UK label | US label | Notes |
|---|---|---|
| AA | AA | Identical labeling in both systems. |
| A | A | Direct match. |
| B | B | Direct match. |
| C | C | Direct match. |
| D | D | No change required. |
| DD | DD | US also prints DD for this half step. |
| E | DDD / F | US combines this volume into DDD or single-letter F. |
| F | G | US moves forward one letter after dropping the extra F. |
| FF | H | Insert the US H when the second F disappears. |
| G | I | Advance one letter when converting to the US alphabet. |
| GG | J | US J represents the GG half step. |
| H | K | Return to the single K at this depth. |
| HH | L | US L covers the HH half step. |
| J | M | US M is the nearest match for UK J. |
| JJ | N | Move to US N when you see JJ on a UK label. |
| K | O | US O captures UK K volume. |
| KK | P | Specialty US brands use P for UK KK. |
Convert your size in four steps
- Confirm your UK baseline Start from a UK bra that fits well so you know the cup volume you want to keep.
- Swap the cup letter Use the chart to replace double letters with the nearest US letter and note any DDD/F notation.
- Use sister sizes if needed If the US band feels different, move up or down a band and adjust the cup in the opposite direction.
- Check fit in US styles American brands may have different wire widths or padding—try nearby sizes before committing.
Worked conversion examples
UK 32FF -> US 32H
US cups jump forward when FF is removed, landing on H.
UK 34G -> US 34I
Move ahead one letter because US sizing lacks the intermediate GG.
UK 30HH -> US 30L
Replace the doubled letter with the next single US letter.
UK 36J -> US 36M
Upper end cup letters shift forward several positions in US charts.
Brand sizing cheat sheet
Keep these retailer notes handy when translating UK sizes for US stores.
UK retailers
- Bravissimo
- Figleaves
- John Lewis
- Marks & Spencer
Bravissimo, Figleaves, and British department stores list UK letters first—convert when ordering US-exclusive brands.
US-focused brands
- Bare Necessities
- HerRoom
- ThirdLove
- Soma
Bare Necessities, HerRoom, ThirdLove, and Soma sell in US sizes; use the converted cup on their product pages.
Global marketplaces
- Amazon US
- Nordstrom
- Bloomingdale's
- Dillard's
Amazon US, Nordstrom, Bloomingdale's, and Dillard's often show UK/US conversions side by side—double-check the US column before checkout.
Fit tips after converting
- Expect US bras to skip double letters—write down your new single-letter cup for quick reference.
- Check if a product lists DDD/F; that label usually matches your UK E.
- Track how each US brand feels compared with your UK favourites—wire width and padding can differ.
Helpful tools
Interactive bra size calculator
Measure in inches or centimetres and generate both local and international sizes in one place.
OpenInternational bra size guide
Compare US, UK, EU, FR, IT, JP, AU and more in a single view.
OpenSister size navigator
Adjust bands tighter or looser while holding cup volume steady after you convert.
OpenUK to US conversion FAQ
Why do UK double letters become single letters in the US?
US charts collapse the half steps into single letters like F, H, J. Use the conversion table to see which letter lines up with your UK cup.
Do I need to change my band size?
Bands are measured in inches in both systems, so your number stays the same unless you want a tighter or looser fit.
How do I read US labels that show DDD/F?
DDD and F both represent the UK E cup in many US brands. Check the chart for the nearest match.
Where can I buy US-sized bras after converting?
Major retailers like Bare Necessities, Nordstrom, Bloomingdale's, and Amazon US list extensive size ranges with international shipping options.