US, UK, and EU dress sizes use different numerical labels. A US size 8 commonly corresponds approximately with UK 12 and EU 40, but conversions are not exact. Use bust, waist, hip, height, and the exact product chart for the final size.
Direct answer
General US, UK, and EU dress-size conversion
| US | UK | EU | General alpha size |
|---|---|---|---|
| 0 | 4 | 32 | XS |
| 2 | 6 | 34 | XS |
| 4 | 8 | 36 | S |
| 6 | 10 | 38 | S |
| 8 | 12 | 40 | M |
| 10 | 14 | 42 | M |
| 12 | 16 | 44 | L |
| 14 | 18 | 46 | L |
| 16 | 20 | 48 | XL |
| 18 | 22 | 50 | XL |
| 20 | 24 | 52 | 2XL |
| 22 | 26 | 54 | 2XL |
| 24 | 28 | 56 | 3XL |
Regional sizing visual
The Same Approximate Size Uses Different Labels
Regional conversion identifies a likely label, but measurements remain the stronger guide.
Why Dress Sizes Differ by Region
US, UK, and EU systems developed with different numbering conventions. Their labels do not describe inches, centimetres, or a universal body measurement directly.
A numerical conversion is therefore a naming comparison rather than a guarantee that the garments have identical dimensions.
General Conversion Chart
| US | UK | EU | Alpha |
|---|---|---|---|
| 00 | 2 | 30 | XXS |
| 0 | 4 | 32 | XS |
| 2 | 6 | 34 | XS |
| 4 | 8 | 36 | S |
| 6 | 10 | 38 | S |
| 8 | 12 | 40 | M |
| 10 | 14 | 42 | M |
| 12 | 16 | 44 | L |
| 14 | 18 | 46 | L |
| 16 | 20 | 48 | XL |
| 18 | 22 | 50 | XL |
| 20 | 24 | 52 | 2XL |
| 22 | 26 | 54 | 2XL |
| 24 | 28 | 56 | 3XL |
| 26 | 30 | 58 | 3XL |
Treat this chart as a starting reference. The exact relationship can vary between brands and size ranges.
How to Convert US Dress Size to UK
A common general rule is to add four to the US numerical size.
- US 4 commonly corresponds with UK 8.
- US 8 commonly corresponds with UK 12.
- US 12 commonly corresponds with UK 16.
- US 16 commonly corresponds with UK 20.
This rule is approximate and should not replace the retailer's chart.
How to Convert UK Dress Size to US
A common general rule is to subtract four from the UK numerical size.
- UK 8 commonly corresponds with US 4.
- UK 12 commonly corresponds with US 8.
- UK 16 commonly corresponds with US 12.
- UK 20 commonly corresponds with US 16.
How to Convert US Dress Size to EU
A common general conversion places US sizes about 32 numbers below the EU label in the middle of the range.
- US 4 commonly corresponds with EU 36.
- US 8 commonly corresponds with EU 40.
- US 12 commonly corresponds with EU 44.
- US 16 commonly corresponds with EU 48.
How to Convert EU Dress Size to US
- EU 36 commonly corresponds with US 4.
- EU 40 commonly corresponds with US 8.
- EU 44 commonly corresponds with US 12.
- EU 48 commonly corresponds with US 16.
How to Convert UK Dress Size to EU
- UK 8 commonly corresponds with EU 36.
- UK 12 commonly corresponds with EU 40.
- UK 16 commonly corresponds with EU 44.
- UK 20 commonly corresponds with EU 48.
Why Conversion Charts Are Approximate
Brands choose their own bust, waist, and hip ranges. They also use different grading between sizes.
A converted US 8 and UK 12 may be approximate equivalents, but one brand may provide more waist or hip room than another.
Regional label
US, UK, or EU number
Identifies a likely category but not exact body dimensions.
Body chart
Bust, waist, and hips
Provides the strongest comparison for the wearer.
Product fit
Silhouette and construction
Determines how the converted size behaves in the actual dress.
Regional Size vs. Body Measurement
The converted number should lead you to a row in the product chart. Bust, waist, and hip measurements should then confirm whether that row is suitable.
Do not order from the converted label alone when measurements are available.
What If Measurements Suggest Different Converted Sizes?
Choose the size required by the most restrictive measurement and the dress silhouette.
A fitted bodice may be controlled by bust, while a sheath dress may be controlled by hips.
Alpha Sizes Are Also Approximate
XS, S, M, L, and XL do not have universal body ranges. A medium can cover different numerical sizes across brands.
Treat alpha conversions as general orientation only.
Petite Regional Sizes
Petite sizing changes vertical proportions such as bodice length, waist placement, armholes, sleeves, and skirt length.
A petite US 8 and regular US 8 may share similar circumference ranges but use different lengths and shaping positions.
Tall Regional Sizes
Tall sizing lengthens vertical proportions without necessarily increasing bust, waist, or hips by a complete numerical size.
Plus-Size Regional Conversion
Plus-size ranges may use different grading and labels from straight-size ranges.
Some brands use separate systems such as 1X, 2X, and 3X rather than direct numerical equivalents.
Junior, Misses, and Women's Sizing
Some US retailers separate junior, misses, and women's ranges. These categories may use different proportions and grading even when the numerical labels look similar.
Confirm the category before converting the number.
Italian and French Dress Sizes
Some European retailers use country-specific systems that do not align perfectly with a general EU chart.
Use the retailer's country-specific conversion table when available.
How Dress Style Affects Converted Size
Sheath dress
Requires close comparison of bust, waist, and hips.
A-line dress
Bust and waist may matter more because the skirt provides hip room.
Shift dress
Shoulder and bust fit may control the size while the waist remains loose.
Bodycon dress
Fabric stretch and recovery strongly affect whether the converted size works.
How Fabric Affects Conversion
A converted size in rigid woven fabric may require more room than a similar knit dress.
Lining, boning, cups, zips, and internal structure can also change the effective fit.
How to Convert Dress Size Online Safely
- Use conversion to identify a likely regional label.
- Open the exact product chart.
- Compare bust, waist, and hips.
- Check whether the chart uses body or garment measurements.
- Review petite, regular, or tall options.
- Check dress silhouette, fabric, and lining.
- Read repeated fit comments.
- Review return and exchange rules.
Common Dress-Size Conversion Mistakes
- Treating the conversion as exact
- Ignoring the product chart
- Using one measurement only
- Ignoring petite and tall proportions
- Assuming alpha sizes are standardized
- Ignoring junior, misses, or plus-size categories
- Ignoring fabric stretch and lining
- Confusing body and garment measurements
Dress sizing tool
Use the Dress Size Calculator
Enter bust, natural waist, hips, height, regional sizing system, and preferred fit to estimate a general starting size.
Questions and answers
Frequently Asked Questions
What is a US size 8 in UK and EU dress sizes?
A US size 8 commonly converts approximately to UK 12 and EU 40, but brand-specific charts can differ.
What is a UK size 10 in US sizing?
A UK size 10 commonly converts approximately to US 6 and EU 38.
What is an EU size 42 in US and UK sizing?
EU 42 commonly converts approximately to US 10 and UK 14.
Are international dress conversions exact?
No. They are approximate because brands use different body ranges, grading systems, fit models, and garment construction.
Should I convert the label or use measurements?
Use the converted label only as a starting point and verify bust, waist, hips, height, and product-specific garment measurements.