US Size to UK Size Conversion Table
| US Size (US) | UK Size (UK) | Reference Benchmark | Formula Step |
|---|---|---|---|
| 0 US | 4 UK | Petite silk organza cocktail slip dress | UK = 0 + 4 = 4 |
| 2 US | 6 UK | Fitted double-breasted houndstooth blazer | UK = 2 + 4 = 6 |
| 4 US | 8 UK | Pleated A-line cotton summer sundress | UK = 4 + 4 = 8 |
| 6 US | 10 UK | Classic wool gabardine pencil skirt | UK = 6 + 4 = 10 |
| 8 US | 12 UK | Relaxed cable-knit cashmere crewneck sweater | UK = 8 + 4 = 12 |
| 10 US | 14 UK | Tailored double-faced wool wrap trench coat | UK = 10 + 4 = 14 |
| 12 US | 16 UK | Structured corporate business pant suit | UK = 12 + 4 = 16 |
| 14 US | 18 UK | Floor-length chiffon evening bridesmaid gown | UK = 14 + 4 = 18 |
| 16 US | 20 UK | Tiered bohemian floral maxi dress | UK = 16 + 4 = 20 |
| 18 US | 22 UK | Plus-fit stretch denim high-rise jeans | UK = 18 + 4 = 22 |
| 20 US | 24 UK | Waterproof hooded storm commuter parka | UK = 20 + 4 = 24 |
| 22 US | 26 UK | Elegantly draped satin formal evening tunic | UK = 22 + 4 = 26 |
| 24 US | 28 UK | Cozy fleece-lined quilted winter puffer jacket | UK = 24 + 4 = 28 |
| 26 US | 30 UK | Bespoke velvet tailored evening tuxedo | UK = 26 + 4 = 30 |
| 28 US | 32 UK | Hand-embroidered specialty gala ballgown | UK = 28 + 4 = 32 |
| 30 US | 34 UK | Custom atelier ceremonial couture robe | UK = 30 + 4 = 34 |
US Size to UK Size Formula & Unit Definitions
Because both the American and British apparel grading systems utilize identical 2-inch (5 cm) body circumference increments between adjacent even sizes, the mathematical relationship between the two standards is a pure integer offset: UK = US + 4.
Quick Estimation: Simply add 4 to your US dress size to find your British equivalent. For example, a US 4 is a UK 8, a US 6 is a UK 10, and a US 10 is a UK 14.
US Size (US)
Source Standard- Standardized under ASTM D5585 specifications for adult female body dimensions.
- Numbered on an even scale starting from size 00 and 0 (petite) through sizes 16 to 24+ (plus size).
- Calibrated with slightly broader shoulder and torso allowances typical of North American ready-to-wear.
UK Size (UK)
Target Standard- Standardized under British Standards Institution BS 3666 specifications.
- Graded on an even scale offset four sizes above US sizing (a US size 6 equates to a UK size 10).
- Apparel lasts and garment patterns typically feature higher armholes and closer-fitting silhouettes.
Frequently Asked Questions
Q.How do you convert US dress size to UK size?
Add 4 to your US dress size. For example, a US size 6 is a UK size 10, and a US size 8 is a UK size 12. To convert in the opposite direction, consult our UK to US clothing converter.
Q.What is the formula for converting US to UK clothing sizes?
The official formula is UK = US + 4. Because both sizing systems increment by standard 2-inch body circumference intervals, the conversion is a direct 4-unit addition.
Q.What is a US size 8 in UK clothing?
A US size 8 equals a UK size 12 (8 + 4 = 12). This represents a medium in international women's ready-to-wear apparel.
Q.Do UK clothing sizes run smaller than US sizes?
Yes. Beyond the numerical offset of 4, British clothing patterns frequently incorporate higher armholes and a more tapered cut through the bust and waist compared to American cuts.