Introduction: Why Clothing Size Conversion Matters
Clothing sizes vary dramatically across countries, brands, and even different clothing categories. This inconsistency makes online shopping and international travel particularly challenging. Understanding how to convert between sizing systems is essential for finding well-fitting clothes regardless of where they’re made or sold. This comprehensive guide will help you navigate the complex world of international clothing sizes, ensuring you can shop confidently across borders and brands.
Core Sizing Systems Worldwide
There are several major sizing systems used globally:
| Region | System Type | Characteristics |
|---|---|---|
| US/Canada | Numerical and letter-based | Tends to run larger than other regions |
| UK | Numerical | Similar to US but typically 2-4 sizes smaller |
| EU | Numerical | Standardized across most European countries |
| International (ISO) | Letter-based (XXS-XXL) | Used globally as a simplified alternative |
| Asia (China, Japan, Korea) | Numerical | Generally smaller than Western sizing |
| Australia/NZ | Numerical | Similar to UK sizing with some variations |
Women’s Clothing Size Conversion
Tops, Dresses, and Jackets
| US | UK | EU | International | Australia | Japan |
|---|---|---|---|---|---|
| 00 | 2 | 30 | XXS | 4 | 3 |
| 0 | 4 | 32 | XXS | 6 | 5 |
| 2 | 6 | 34 | XS | 8 | 7 |
| 4 | 8 | 36 | S | 10 | 9 |
| 6 | 10 | 38 | S | 12 | 11 |
| 8 | 12 | 40 | M | 14 | 13 |
| 10 | 14 | 42 | M | 16 | 15 |
| 12 | 16 | 44 | L | 18 | 17 |
| 14 | 18 | 46 | L | 20 | 19 |
| 16 | 20 | 48 | XL | 22 | 21 |
| 18 | 22 | 50 | XL | 24 | 23 |
| 20 | 24 | 52 | XXL | 26 | 25 |
| 22 | 26 | 54 | XXL | 28 | 27 |
Women’s Bust Measurements (in inches/cm)
| Size | US/UK (inches) | EU/Int (cm) |
|---|---|---|
| XXS | 30-31″ | 76-79 cm |
| XS | 32-33″ | 80-83 cm |
| S | 34-35″ | 84-87 cm |
| M | 36-37″ | 88-91 cm |
| L | 38-40″ | 92-100 cm |
| XL | 41-43″ | 101-110 cm |
| XXL | 44-46″ | 111-119 cm |
Women’s Jeans and Pants
Numerical Sizing
| US | UK | EU | Australia | Japan |
|---|---|---|---|---|
| 00/0 | 4 | 32 | 6 | 5 |
| 2 | 6 | 34 | 8 | 7 |
| 4 | 8 | 36 | 10 | 9 |
| 6 | 10 | 38 | 12 | 11 |
| 8 | 12 | 40 | 14 | 13 |
| 10 | 14 | 42 | 16 | 15 |
| 12 | 16 | 44 | 18 | 17 |
| 14 | 18 | 46 | 20 | 19 |
| 16 | 20 | 48 | 22 | 21 |
Waist Sizing (in inches)
| US Waist (inches) | UK | EU | Australia |
|---|---|---|---|
| 24 | 24 | 32 | 6 |
| 25 | 25 | 34 | 8 |
| 26-27 | 26-27 | 36 | 10 |
| 28 | 28 | 38 | 12 |
| 29 | 29 | 40 | 14 |
| 30-31 | 30-31 | 42 | 16 |
| 32 | 32 | 44 | 18 |
| 33-34 | 33-34 | 46 | 20 |
| 35-36 | 35-36 | 48 | 22 |
Women’s Shoes
| US | UK | EU | Australia | Japan | Inches | Centimeters |
|---|---|---|---|---|---|---|
| 5 | 3 | 35-36 | 5 | 21 | 8.5″ | 21.6 cm |
| 5.5 | 3.5 | 36 | 5.5 | 21.5 | 8.75″ | 22 cm |
| 6 | 4 | 37 | 6 | 22 | 9″ | 22.5 cm |
| 6.5 | 4.5 | 37-38 | 6.5 | 22.5 | 9.25″ | 23 cm |
| 7 | 5 | 38 | 7 | 23 | 9.5″ | 23.5 cm |
| 7.5 | 5.5 | 38-39 | 7.5 | 23.5 | 9.75″ | 24 cm |
| 8 | 6 | 39 | 8 | 24 | 10″ | 24.5 cm |
| 8.5 | 6.5 | 40 | 8.5 | 24.5 | 10.125″ | 25 cm |
| 9 | 7 | 41 | 9 | 25 | 10.25″ | 25.5 cm |
| 9.5 | 7.5 | 41-42 | 9.5 | 25.5 | 10.5″ | 26 cm |
| 10 | 8 | 42 | 10 | 26 | 10.75″ | 26.5 cm |
| 11 | 9 | 43 | 11 | 27 | 11″ | 27.5 cm |
Men’s Clothing Size Conversion
Shirts and Jackets
| International | US | UK | EU | Australia | Japan |
|---|---|---|---|---|---|
| XS | 34 | 34 | 44 | 34 | S |
| S | 36-38 | 36-38 | 46-48 | 36-38 | M |
| M | 40-42 | 40-42 | 50-52 | 40-42 | L |
| L | 44-46 | 44-46 | 54-56 | 44-46 | LL |
| XL | 48-50 | 48-50 | 58-60 | 48-50 | 3L |
| XXL | 52-54 | 52-54 | 62-64 | 52-54 | 4L |
Men’s Dress Shirts (Neck Size)
| US (inches) | UK (inches) | EU (cm) |
|---|---|---|
| 14 | 14 | 36 |
| 14.5 | 14.5 | 37 |
| 15 | 15 | 38 |
| 15.5 | 15.5 | 39 |
| 16 | 16 | 41 |
| 16.5 | 16.5 | 42 |
| 17 | 17 | 43 |
| 17.5 | 17.5 | 44 |
| 18 | 18 | 46 |
Men’s Pants and Jeans
Most men’s pants use waist and inseam measurements in inches across all regions (e.g., 32W/30L). However, some European brands use the following conversion:
| US/UK Waist (inches) | EU | France | Italy | Japan |
|---|---|---|---|---|
| 28 | 44 | 38 | 42 | S |
| 30 | 46 | 40 | 44 | M |
| 32 | 48 | 42 | 46 | L |
| 34 | 50 | 44 | 48 | LL |
| 36 | 52 | 46 | 50 | 3L |
| 38 | 54 | 48 | 52 | 4L |
| 40 | 56 | 50 | 54 | 5L |
| 42 | 58 | 52 | 56 | 6L |
Men’s Shoes
| US | UK | EU | Australia | Japan | Inches | Centimeters |
|---|---|---|---|---|---|---|
| 7 | 6 | 40 | 6 | 25 | 9.6″ | 24.4 cm |
| 7.5 | 6.5 | 40-41 | 6.5 | 25.5 | 9.8″ | 24.8 cm |
| 8 | 7 | 41 | 7 | 26 | 10″ | 25.2 cm |
| 8.5 | 7.5 | 42 | 7.5 | 26.5 | 10.2″ | 25.7 cm |
| 9 | 8 | 42-43 | 8 | 27 | 10.4″ | 26.2 cm |
| 9.5 | 8.5 | 43 | 8.5 | 27.5 | 10.6″ | 26.7 cm |
| 10 | 9 | 44 | 9 | 28 | 10.8″ | 27.3 cm |
| 10.5 | 9.5 | 44-45 | 9.5 | 28.5 | 11″ | 27.8 cm |
| 11 | 10 | 45 | 10 | 29 | 11.2″ | 28.3 cm |
| 11.5 | 10.5 | 45-46 | 10.5 | 29.5 | 11.4″ | 28.8 cm |
| 12 | 11 | 46 | 11 | 30 | 11.6″ | 29.4 cm |
| 13 | 12 | 47 | 12 | 31 | 12″ | 30.5 cm |
Children’s Clothing Size Conversion
Children’s Clothing (General)
| Age | US | UK | EU | Australia |
|---|---|---|---|---|
| 0-3M | NB/0-3M | NB/0-3M | 56-62 | 000 |
| 3-6M | 3-6M | 3-6M | 62-68 | 00 |
| 6-12M | 6-12M | 6-12M | 68-74 | 0 |
| 12-18M | 12-18M | 12-18M | 74-80 | 1 |
| 18-24M | 18-24M | 18-24M | 80-86 | 1-2 |
| 2T | 2T | 2-3Y | 86-92 | 2 |
| 3T | 3T | 3-4Y | 92-98 | 3 |
| 4T | 4T | 4-5Y | 98-104 | 4 |
| 5 | 5 | 5-6Y | 104-110 | 5 |
| 6 | 6 | 6-7Y | 110-116 | 6 |
| 7 | 7 | 7-8Y | 116-122 | 7 |
| 8 | 8 | 8-9Y | 122-128 | 8 |
| 10 | 10 | 9-10Y | 128-134 | 10 |
| 12 | 12 | 11-12Y | 140-146 | 12 |
| 14 | 14 | 13-14Y | 152-158 | 14 |
Children’s Shoes
| Age | US | UK | EU | Australia | CM |
|---|---|---|---|---|---|
| 0-6M | 1 | 0.5 | 16 | 0-6M | 8 |
| 6-12M | 3 | 2.5 | 18 | 6-12M | 10 |
| 12-18M | 5 | 4 | 20 | 12-18M | 12 |
| 18-24M | 6 | 5 | 22 | 18-24M | 13 |
| 2Y | 7 | 6 | 23 | 2Y | 14 |
| 3Y | 8 | 7 | 24 | 3Y | 15 |
| 4Y | 9 | 8 | 25 | 4Y | 16 |
| 5Y | 10 | 9 | 27 | 5Y | 17 |
| 6Y | 11 | 10 | 28 | 6Y | 18 |
| 7Y | 12 | 11 | 30 | 7Y | 19 |
| 8Y | 13 | 12 | 31 | 8Y | 20 |
| 9Y | 1 | 13 | 32 | 9Y | 21 |
| 10Y | 2 | 1 | 33 | 10Y | 22 |
| 11Y | 3 | 2 | 34 | 11Y | 23 |
| 12Y | 4 | 3 | 35 | 12Y | 23.5 |
Special Size Categories
Maternity Sizes
Generally follow regular women’s sizing, but with considerations for belly growth:
- Pre-pregnancy size: Most brands recommend choosing your pre-pregnancy size
- US/UK: Often labeled as S (4-6), M (8-10), L (12-14), XL (16-18)
- Bottoms: May be sized by pre-pregnancy size with stretchy panels
Plus Sizes
| US | UK | EU | Australia |
|---|---|---|---|
| 14W-16W | 18-20 | 46-48 | 18-20 |
| 18W-20W | 22-24 | 50-52 | 22-24 |
| 22W-24W | 26-28 | 54-56 | 26-28 |
| 26W-28W | 30-32 | 58-60 | 30-32 |
Petite Sizes
For women typically 5’3″ (160 cm) or shorter:
- Usually labeled with a “P” after the size (e.g., 6P, 8P)
- Same measurements as standard sizes but with shorter lengths
Tall Sizes
For women typically 5’8″ (173 cm) or taller:
- Usually labeled with a “T” after the size (e.g., 6T, 8T)
- Same measurements as standard sizes but with longer lengths
Underwear and Intimate Apparel
Women’s Bras
Band Size Conversion
| US/UK (inches) | EU/France | Australia/NZ | Japan |
|---|---|---|---|
| 30 | 65 | 8 | 65 |
| 32 | 70 | 10 | 70 |
| 34 | 75 | 12 | 75 |
| 36 | 80 | 14 | 80 |
| 38 | 85 | 16 | 85 |
| 40 | 90 | 18 | 90 |
| 42 | 95 | 20 | 95 |
| 44 | 100 | 22 | 100 |
Cup Size Conversion
| US | UK | EU | Australia/NZ | France | Italy | Japan |
|---|---|---|---|---|---|---|
| AA | AA | AA | AA | AA | – | AAA |
| A | A | A | A | A | 1 | A |
| B | B | B | B | B | 2 | B |
| C | C | C | C | C | 3 | C |
| D | D | D | D | D | 4 | D |
| DD/E | DD | E | DD | E | 5 | E |
| DDD/F | E | F | E | F | 6 | F |
| G | F | G | F | G | 7 | G |
| H | FF | H | FF | H | 8 | H |
| I | G | I | G | I | 9 | I |
| J | GG | J | GG | J | 10 | J |
| K | H | K | H | K | 11 | K |
Men’s Underwear
| International | US | UK | EU | Waist (inches) | Waist (cm) |
|---|---|---|---|---|---|
| XS | XS | XS | XS | 28-30 | 71-76 |
| S | S | S | S | 30-32 | 76-81 |
| M | M | M | M | 33-34 | 84-86 |
| L | L | L | L | 36-38 | 91-97 |
| XL | XL | XL | XL | 40-42 | 102-107 |
| XXL | XXL | XXL | XXL | 44-46 | 112-117 |
Accessories Size Conversion
Hats
| Size | US (inches) | UK (inches) | EU (cm) | Head Circumference (cm) |
|---|---|---|---|---|
| XS | 6⅝-6¾ | 6½-6⅝ | 53-54 | 53-54 cm |
| S | 6⅞-7 | 6¾-6⅞ | 55-56 | 55-56 cm |
| M | 7⅛-7¼ | 7-7⅛ | 57-58 | 57-58 cm |
| L | 7⅜-7½ | 7¼-7⅜ | 59-60 | 59-60 cm |
| XL | 7⅝-7¾ | 7½-7⅝ | 61-62 | 61-62 cm |
| XXL | 7⅞-8 | 7¾-7⅞ | 63-64 | 63-64 cm |
Gloves
| Size | US | UK | EU | Hand Circumference (inches) | Hand Circumference (cm) |
|---|---|---|---|---|---|
| XS | 6 | 6 | 6 | 6-6.5″ | 15.2-16.5 cm |
| S | 7 | 7 | 7 | 7-7.5″ | 17.8-19 cm |
| M | 8 | 8 | 8 | 8-8.5″ | 20.3-21.6 cm |
| L | 9 | 9 | 9 | 9-9.5″ | 22.9-24.1 cm |
| XL | 10 | 10 | 10 | 10-10.5″ | 25.4-26.7 cm |
| XXL | 11 | 11 | 11 | 11-11.5″ | 27.9-29.2 cm |
Common Challenges and Solutions
Vanity Sizing
| Challenge | Solution |
|---|---|
| Brands using flattering but inconsistent sizing | Ignore the size tag; measure yourself and use measurements |
| Significant variance between brands | Know your measurements in inches/cm and check size guides |
| Changing sizes over time | Re-measure yourself annually and adjust your “known size” |
Online Shopping Strategies
| Challenge | Solution |
|---|---|
| Uncertain sizing | Check brand-specific size charts before purchasing |
| No size chart available | Search for the brand + “runs large/small” in reviews |
| International ordering | Convert your size using this chart; size up when in doubt |
| Returns policy | Check return policies for international orders before purchasing |
Brand-Specific Sizing Trends
| Brand Category | Sizing Trend |
|---|---|
| European luxury brands | Often run small compared to US sizes |
| US mall brands | Often feature vanity sizing (run larger) |
| Athletic wear | Often more consistent with measurements |
| Fast fashion | Highly variable; check each brand individually |
| Japanese brands | Typically run 1-2 sizes smaller than Western sizing |
How to Measure Yourself
Essential Measurements
| Measurement | How to Measure | Tips |
|---|---|---|
| Bust/Chest | Measure around the fullest part of your bust/chest | Keep tape parallel to the floor |
| Waist | Measure around your natural waistline | Usually the narrowest part of your torso |
| Hips | Measure around the fullest part of your hips | Usually about 8″ below your waist |
| Inseam | Measure from crotch to bottom of leg | Measure along the inside of your leg |
| Neck (men) | Measure around your neck where a collar sits | Add 0.5″ for comfort for dress shirts |
| Sleeve length | Measure from shoulder to wrist | Keep arm slightly bent |
Tools Needed
- Flexible measuring tape
- Mirror (or a friend to help)
- Fitted but not tight undergarments
- Paper to record measurements
Best Practices and Tips
General Shopping Tips
- Always check the size chart for each brand before purchasing
- Know your measurements in both inches and centimeters
- Read customer reviews for sizing information
- When in doubt between two sizes, usually size up
- Consider the fabric (stretchy fabrics may allow for smaller sizes)
- Factor in the fit style (slim, regular, relaxed) when choosing a size
International Shopping Tips
- European luxury brands typically run smaller than US brands
- Asian brands often run 1-2 sizes smaller than Western brands
- UK sizes are generally 2 sizes higher than US sizes for women
- When buying shoes internationally, consider width as well as length
- Allow for longer shipping and possible returns when buying internationally
Care and Alterations
- Factor in shrinkage for natural fibers like cotton (size up if in doubt)
- Consider the cost of alterations when purchasing investment pieces
- Some measurements can easily be altered (hem length, sleeve length)
- Some measurements are difficult to alter (shoulders, rise of pants)
Resources for Further Learning
Helpful Websites and Apps
- SizeCharter – Comprehensive size conversion tool
- TrueFit – AI-powered size recommendation engine
- SizeAdvisor – Community-based size recommendations
- Good On You – Ethical brand directory with sizing information
- ASOS Fit Assistant – Helps find your size across different brands
Professional Measurement Services
- Many department stores offer free professional measuring
- Tailors and alterations shops usually offer measuring services
- Lingerie specialty stores provide professional bra fittings
- Some online retailers offer virtual fitting technologies
Books and Guides
- “The Curated Closet” by Anuschka Rees
- “The Lucky Shopping Manual” by Kim France and Andrea Linett
- “How to Get Dressed” by Alison Freer