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View on AmazonBra Size Chart 2026: International Converter (US, UK, EU, Japan, Australia, France)
The most accurate and up-to-date global bra size conversion guide for 2026. Convert your size instantly and find your perfect fit with our comprehensive charts and expert advice.
Did you know that over 80% of women wear the wrong bra size? This comprehensive 2026 guide eliminates the confusion around international bra sizing. With detailed conversion tables and practical fitting advice, you’ll finally understand how to find bras that fit perfectly, no matter where they’re manufactured.
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Global Coverage
Complete conversion for 6 major sizing systems used worldwide
Accurate Measurements
Based on 2026 sizing standards from leading lingerie brands
Expert Guidance
Professional fitting tips and common mistakes to avoid
Free Calculator
Instant size calculation with our advanced tool
Quick Bra Size Conversion Chart 2026
This comprehensive table shows equivalent sizes across different international systems. Find your current size in the left column and see its equivalents in other sizing systems.
| US | UK | EU | France | Japan | Australia |
|---|---|---|---|---|---|
| 30C | 30C | 65C | 80C | 65C | 8C |
| 32B | 32B | 70B | 85B | 70B | 10B |
| 34D | 34D | 75D | 90D | 75D | 12D |
| 36DD | 36E | 80E | 95E | 80E | 14DD |
| 38DDD | 38F | 85F | 100F | 85F | 16E |
| 40G | 40FF | 90G | 105G | 90G | 18F |
Understanding Bra Sizing: Band and Cup Explained
A bra size consists of two components: the band size (number) and the cup size (letter). The band represents the measurement around your ribcage, while the cup indicates the difference between your bust and band measurements.
How to Measure Your Band Size
Wrap a measuring tape snugly around your ribcage, directly under your bust. Ensure the tape is parallel to the floor and take the measurement in inches. If you get an odd number, round up to the nearest even number to find your band size.
How to Measure Your Cup Size
Measure around the fullest part of your bust, keeping the tape parallel to the floor. Subtract your band measurement from this bust measurement. The difference determines your cup size (see the cup size chart below).
International Bra Band Size Chart 2026
Band sizes vary significantly across different countries. This chart helps you convert between the most common band sizing systems used worldwide.
| 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″ |
Cup Size Chart – Bust Minus Band Difference
Cup sizes represent the volume difference between your bust and band measurements. This chart shows how these differences translate to cup letters in different sizing systems.
| Difference | 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 | DD | E |
| 6″ (15 cm) | DDD | E | F |
| 7″ (17.5 cm) | G | FF | G |
| 8″ (20 cm) | H | GG | H |
Sister Sizes – Same Cup Volume, Different Band
Sister sizes are bras with different band sizes but the same cup volume. Understanding this concept can help you find a better fit when your usual size isn’t available or doesn’t feel quite right.
These three sizes all have the same cup volume. If the band on your 34C feels too tight, try a 36B. If it feels too loose, try a 32D.
| Your Size | Band Too Tight? Try | Band Too Loose? Try |
|---|---|---|
| 34C | 36B | 32D |
| 36D | 38C | 34DD |
| 38DD | 40D | 36E |
| 32DD | 34D | 30F |
Regional Sizing Differences Explained
US vs UK Sizing
While band sizes are identical between US and UK systems, cup sizing diverges after D. The US typically uses DD, DDD, G, H, while the UK uses DD, E, F, FF, G, GG, H. This is the most common point of confusion for international shoppers.
European Sizing
European sizing uses centimeters rather than inches. The band size is typically the underbust measurement in cm plus 10-15 cm for comfort. For example, a 75 band in Europe fits a 34-inch underbust (34 inches ≈ 86 cm, minus 10-15 cm = 71-76 cm).
Japanese and Australian Sizing
Japanese sizing follows a similar pattern to European sizing but often runs smaller in both band and cup. Australian sizing is similar to UK sizing but with different band numbering (6, 8, 10, 12 instead of 28, 30, 32, 34).
Brand Variations and Fit Differences
Even within the same sizing system, different brands may fit differently. Here’s what to expect from popular lingerie brands:
Victoria’s Secret
Runs small in band, consistent in cups
Panache
True to size, excellent for larger cups
Freya
Generous in cups, softer bands
Calvin Klein
Modern fit, often smaller in cups
Wacoal
Asian fit, runs smaller overall
ThirdLove
Half-cup sizes available, true to size
Common Bra Fit Problems and Solutions
Band Riding Up
If the back of your bra rides up, your band is too loose. Try going down a band size (and up a cup size to maintain volume).
Spillage at Top or Sides
If breast tissue spills out of the cups, you need a larger cup size. This is one of the most common fitting issues.
Gaps in Cups
Gaps can mean the cups are too large, but they can also indicate a shape mismatch. Try a different style (balconette, plunge, etc.) before changing sizes.
Straps Digging In
If straps dig into your shoulders, the band may not be providing enough support. A tighter band should transfer weight from shoulders to the band.
Frequently Asked Questions
Are US and UK bra sizes the same?
Why do EU sizes look bigger?
Do Japanese bras run smaller?
What are sister sizes?
How often should I measure myself?
Why does my bra size vary between brands?
What 2.8 Million+ Women Say
“Finally found my real size after 12 years! No more back pain. The sister size concept was a game-changer for me.”
“Bought from a UK brand for the first time — perfect fit! The conversion chart saved me from making an expensive mistake.”
“The calculator said 30G. I cried when it fit perfectly. I’d been wearing 34DD for years and never understood why it never felt right.”
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