Bra Size Chart 2026:
International Converter
Bra fit surveys consistently point to the same problem: most people are still wearing whatever size they measured years ago, on whichever chart happened to be printed on the tag at the time. That’s rarely a coincidence — band and cup logic isn’t taught anywhere, and every country reads the same tape measurement differently. This guide lays out the full conversion picture — US, UK, EU, Japan, Australia, and France — alongside the sister-size logic that most charts leave out entirely.
US, UK, EU, France, Japan and Australia converted side by side — no separate lookups needed.
Band and cup logic checked against current retailer charts, not carried over from an old table.
What to try when the cup fits but the band doesn’t — the fix most charts skip.
Quick Bra Size Conversion Chart 2026
Find your size in the US column and read across. The band number barely changes between systems — it’s the cup letter that drifts, and it drifts more the higher up the alphabet you go.
| US | UK | EU | France | Japan | Australia |
|---|---|---|---|---|---|
| 30B | 30B | 65B | 80B | 65B | 8B |
| 30C | 30C | 65C | 80C | 65C | 8C |
| 32B | 32B | 70B | 85B | 70B | 10B |
| 32C | 32C | 70C | 85C | 70C | 10C |
| 34C | 34C | 75C | 90C | 75C | 12C |
| 34D | 34D | 75D | 90D | 75D | 12D |
| 36DD | 36DD | 80E | 95E | 80E | 14DD |
| 36DDD / F | 36E | 80F | 95F | 80F | 14E |
| 38DDD / F | 38E | 85F | 100F | 85F | 16E |
| 40G | 40F | 90G | 105G | 90G | 18F |
| 42H | 42FF | 95H | 110H | 95H | 20FF |
Key Takeaways
- Band numbers barely move between US, UK and Japan — the cup letter is where sizing systems disagree.
- EU and France use centimeter-based band labels (75, 90) that aren’t literal tape readings — they’re retail conventions.
- Australia’s system is arithmetic: subtract 22 from the US/UK band number to get the AU band, keep the UK cup letter.
- Cup drift compounds above a D cup — the higher the letter, the more the US and UK charts diverge.
How to Measure Your Bra Size Correctly
Two measurements, no fitting-room visit required. The most common mistake isn’t a math error — it’s measuring over a padded bra, which adds an inch or two you don’t actually have.
Measure Your Band (Underbust)
Wrap the tape snugly directly under your bust, around your ribcage, keeping it level front to back. Write down the snug number before comparing it to any brand chart — retail bands often add ease on top of this raw measurement, so don’t round up yourself.
Measure Your Bust (Fullest Point)
Measure around the fullest part of your bust — level, not pulled tight. Subtract your band number from this measurement; the difference in inches (or cm) is what maps to your cup letter in the table below.
International Band Size Chart
Band numbers look wildly different across countries, but they’re all describing the same underbust measurement — just labeled by a different convention.
| US / UK | EU | France | Japan | Australia | Underbust (inches) |
|---|---|---|---|---|---|
| 28 | 60 | 75 | 60 | 6 | 23–24″ |
| 30 | 65 | 80 | 65 | 8 | 25–26″ |
| 32 | 70 | 85 | 70 | 10 | 27–28″ |
| 34 | 75 | 90 | 75 | 12 | 29–30″ |
| 36 | 80 | 95 | 80 | 14 | 31–32″ |
| 38 | 85 | 100 | 85 | 16 | 33–34″ |
| 40 | 90 | 105 | 90 | 18 | 35–36″ |
| 42 | 95 | 110 | 95 | 20 | 37–38″ |
Cup Size Chart — Bust Minus Band
Cup size is just the gap between your bust and band measurements — but the same one-inch gap gets a different letter depending on which country’s chart you’re reading.
| Difference (inches) | Difference (cm) | US Cup | UK Cup | EU / Japan / France |
|---|---|---|---|---|
| 1″ | 2.5 cm | A | A | A |
| 2″ | 5 cm | B | B | B |
| 3″ | 7.5 cm | C | C | C |
| 4″ | 10 cm | D | D | D |
| 5″ | 12.5 cm | DD / E | DD | E |
| 6″ | 15 cm | DDD / F | E | F |
| 7″ | 17.5 cm | G | F | G |
| 8″ | 20 cm | H | FF | H |
| 9″ | 22.5 cm | I | G | I |
| 10″ | 25 cm | J | GG | J |
Same Cup Volume, Different Band
This is the part most charts leave out entirely. A sister size holds the exact same cup volume as your regular size — only the band width changes. It’s the fix for “the cup fits but the band doesn’t,” which is one of the most common fit complaints there is.
All three hold the same cup volume — only the band width changes.
| Your Size | Band Too Tight? Try → | Band Too Loose? Try → |
|---|---|---|
| 32DD | 34D | 30DDD / F |
| 34C | 36B | 32D |
| 34D | 36C | 32DD |
| 36D | 38C | 34DD |
| 36DD | 38D | 34DDD / F |
| 38DD | 40D | 36DDD / F |
| 40G | 42DDD / F | 38H |
Want the full A–P cup breakdown instead of these seven rows? Our dedicated sister sizes guide covers every combination.
Regional Sizing Differences Explained
Same measurements, six different labels. Here’s what’s actually different about each system — and which one to trust when a size tag doesn’t match what you calculated.
Measured in inches. Cup letters repeat after D (DD, DDD) instead of moving to a new letter, which is the single biggest source of confusion for shoppers used to UK sizing.
Identical band numbers to the US. Cup letters continue DD, E, F, FF, G, GG instead of repeating D — the system used by Panache, Freya, and Fantasie. See our brand size decoder for how each of those actually fits.
Band sizes are given in centimeters and run numerically larger (EU 75 = US/UK 34). Cup letters mostly stay single-letter past D. Most French and German brands follow this system.
Adds 15 to the EU band number — a US 34 band becomes France 90. Cup letters follow the EU convention. Common across French luxury lingerie houses.
Band sizing tracks close to EU. Cups tend to run one to two sizes smaller in practice — check the brand’s own chart and size up if reviews mention shallow coverage. Uniqlo is the clearest real-world example of this.
Band numbering runs 6, 8, 10, 12 instead of 28, 30, 32, 34. Cup letters match the UK system exactly. AU 12C = US/UK 34C — see the full Australian conversion chart for every band and cup combination plus local brand notes.
How Popular Brands Actually Fit
Same size label, different fit — that’s the reality once you shop across brands. A 34D from Victoria’s Secret and a 34D from Panache are built on different fit models entirely, so treat the number as a starting point, not a guarantee.
Tends to run firm in the band and shallow in the cup. If you’re between bands, try the larger one first. Best range is usually A–DDD. Full notes in our Victoria’s Secret size guide.
True to size, with exceptional support for larger cups (D–K). Consistently one of the more accurately sized brands on the market.
Generous in the cup, softer in the band. Works well for wide-set or projected shapes — expect the band to feel looser than expected at first.
Modern, minimalist cut that tends to run smaller in the cup. Best suited to smaller busts or anyone who prefers a compressive feel.
Can feel snug or structured depending on the style. If you’re between cup sizes, size up in the cup rather than the band.
Offers half-cup sizes (34C½ and similar), which makes it a strong option if you’ve always felt caught between two standard cups.
Need a Chart for a Specific Brand or Country?
The table above covers the six major systems. These guides go further into a single brand or region.
Top Picks After Finding Your Size
Curated everyday bras and support styles our readers commonly compare after using the size chart.
Fruit of the Loom Smooth Cotton T-Shirt Bra
Ultra-soft, flexible and smooth under tees. A simple everyday option for readers who want light support without digging or bulky seams.
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Bali Passion for Comfort Minimizer Bra
Seamless cups, underwire support and a smoother front profile. A stronger option for fuller busts that need support and shape control.
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Common Bra Fit Problems — Solved
If a bra feels wrong, it’s almost always a sizing issue rather than a body issue. Here’s how to diagnose and fix the most common complaints.
The band is too loose. Go down a band size and up a cup size to keep the same volume — the band should stay level all the way around, not just in front.
The cup is too small. Size up in the cup, not the band — spillage is the clearest sign you need more cup room, not more band.
Can mean the cup is too large, but it’s often a shape mismatch instead. Try a different style — balconette or plunge — before sizing down.
The band isn’t carrying its share of the load. A properly fitted band should carry roughly 80% of the support — straps are there to guide, not hold everything up.
Poking at the sides usually means the cup is too narrow. A floating center gore usually means the cup is too small or too shallow for your shape.
Usually a cup-size or style mismatch rather than a band problem. Try a fuller-cup style, or go up one cup size before changing anything else.
Frequently Asked Questions
The questions we get asked most — answered plainly, without the jargon.
Are US and UK bra sizes the same?
Why do EU bra band sizes look so much bigger?
Do Japanese bras run smaller?
What are sister sizes and when should I use them?
How often should I re-measure my bra size?
Why does my bra size change between brands?
What if my measurement falls between two sizes on the chart?
Which country’s bra sizing is easiest to convert?
What Readers Commonly Discover
“I wore a 34B for 12 years. This calculator showed me I’m a 30FF. The difference in comfort is life-changing — I had no idea back pain could just disappear.”
“Bought from a UK brand for the first time and used the conversion chart here. Perfect fit, first try. Saved me from making an expensive mistake.”
“The sister size tip was the thing I never knew I needed. I went from a too-tight 34D to a 36C and it fits beautifully. Such a simple fix.”
Stop Guessing.
Find Your Real Size Today.
Takes less than 60 seconds. No signup. Just your accurate bra size — with sister sizes, shape matching, and brand-specific guidance included.