UK Size to US Size Conversion Table
| UK Size (UK) | US Size (US) | Reference Benchmark | Formula Step |
|---|---|---|---|
| 4 UK | 0 US | Petite silk organza cocktail slip dress | US = 4 − 4 = 0 |
| 6 UK | 2 US | Fitted double-breasted houndstooth blazer | US = 6 − 4 = 2 |
| 8 UK | 4 US | Pleated A-line cotton summer sundress | US = 8 − 4 = 4 |
| 10 UK | 6 US | Classic wool gabardine pencil skirt | US = 10 − 4 = 6 |
| 12 UK | 8 US | Relaxed cable-knit cashmere crewneck sweater | US = 12 − 4 = 8 |
| 14 UK | 10 US | Tailored double-faced wool wrap trench coat | US = 14 − 4 = 10 |
| 16 UK | 12 US | Structured corporate business pant suit | US = 16 − 4 = 12 |
| 18 UK | 14 US | Floor-length chiffon evening bridesmaid gown | US = 18 − 4 = 14 |
| 20 UK | 16 US | Tiered bohemian floral maxi dress | US = 20 − 4 = 16 |
| 22 UK | 18 US | Plus-fit stretch denim high-rise jeans | US = 22 − 4 = 18 |
| 24 UK | 20 US | Waterproof hooded storm commuter parka | US = 24 − 4 = 20 |
| 26 UK | 22 US | Elegantly draped satin formal evening tunic | US = 26 − 4 = 22 |
| 28 UK | 24 US | Cozy fleece-lined quilted winter puffer jacket | US = 28 − 4 = 24 |
| 30 UK | 26 US | Bespoke velvet tailored evening tuxedo | US = 30 − 4 = 26 |
| 32 UK | 28 US | Hand-embroidered specialty gala ballgown | US = 32 − 4 = 28 |
| 34 UK | 30 US | Custom atelier ceremonial couture robe | US = 34 − 4 = 30 |
UK Size to US Size Formula & Unit Definitions
Because both the British and American apparel grading systems advance in identical 2-inch (5 cm) body circumference intervals between adjacent even numbers, the mathematical conversion is a direct integer subtraction: US = UK − 4.
Quick Estimation: Simply subtract 4 from your British dress size to determine your American equivalent. For example, a UK 10 is a US 6, a UK 12 is a US 8, and a UK 14 is a US 10.
UK Size (UK)
Source Standard- Standardized under British Standards Institution BS 3666 specifications.
- Numbered on an even scale starting from UK 4 and UK 6 through sizes UK 18 to 24+.
- Garment patterns frequently feature higher armholes and closer-fitting chest contours.
US Size (US)
Target Standard- Standardized under ASTM D5585 specifications for adult female body measurements.
- Graded on an even scale offset four sizes below UK sizing (a UK size 10 equates to a US size 6).
- Calibrated with slightly more generous ease allowances through the waist and hips.
Frequently Asked Questions
Q.How do you convert UK clothing size to US size?
Subtract 4 from your UK dress size. For example, a UK size 10 is a US size 6, and a UK size 12 is a US size 8. To convert in the opposite direction, consult our US to UK clothing converter.
Q.What is the formula for converting UK to US clothing sizes?
The official formula is US = UK − 4. Because both sizing scales increment by 2-inch body circumference intervals, the conversion is a direct 4-unit subtraction.
Q.What is a UK size 12 in US clothing?
A UK size 12 equals a US size 8 (12 − 4 = 8). In American retail sizing, this corresponds to a standard Medium.
Q.Are British dress sizes cut narrower than American sizes?
Yes. Beyond the numerical label difference of 4, British garments typically have narrower shoulder measurements and a higher armhole depth compared to American ready-to-wear.