While shopping abroad is always an adventure, finding the right size clothes and shoes may be a real pain. A size 8 in the United Kingdom doesn't necessarily match a size 8 in the United States, and can lead to confusion, returns, and frustration.
Whether you're buying clothes online from an American retailer or picking up shoes from a British brand, understanding size conversions is essential. This guide covers everything you need to know about UK vs US sizing for women and men to make international shopping easy and stress-free.
Understanding the Differences
The UK and US sizing systems for both clothing and footwear are based on different measurement standards. For clothing, UK sizes are often slightly smaller than US sizes. For example, a UK women's size 10 usually corresponds to a US size 6 or 8 depending on the brand. Men's clothing follows a similar pattern: a UK 40 jacket may fit like a US 40, but trousers and shirts can vary slightly.
For shoes, the difference is more straightforward. UK shoes tend to be smaller than their US counterparts, with a typical conversion of 1 size difference for men and 2 sizes for women. For instance, a UK women's size 6 usually equates to a US size 8, while a UK men's size 9 is roughly a US size 10.
Why UK and US Sizes Don't Align
UK and US sizes have evolved separately. In the UK, clothing sizes were historically based on actual body measurements using inches, with standardised charts appearing in the 20th century. In contrast, US sizing followed different patterns and 'vanity sizing' trends. Numbers were adjusted to please shoppers, making the same garment feel smaller than its UK equivalent.
Shoe sizes also differ because the UK system starts counting from a different base measurement than the US system.
Understanding these nuances helps prevent ordering errors, especially when shopping online from international retailers like ASOS, Zara, or Nordstrom.
Women's Clothing Sizes
Women's clothing sizes are where confusion is most common. UK sizes are typically four numbers larger than US sizes.
Quick Reference Chart
| UK Size | US Size |
| 6 | 2 |
| 8 | 4 |
| 10 | 6 |
| 12 | 8 |
| 14 | 10 |
| 16 | 12 |
| 18 | 14 |
| 20 | 16 |
Brand-specific cuts matter more than the number. A UK brand might have a closer fit, while US brands often offer more relaxed tailoring. Always check the item's measurement guide.
Maternity and Plus-Size Clothing
For maternity wear, size conversion can be tricky because comfort and stretch are priorities. UK maternity sizes usually follow the standard 4-size difference from US sizing, but it's best to measure your bust, waist, and hips.
Plus-size clothing also varies. UK plus-size ranges may start at UK 18 or 20 (US 14-16), but fit depends on cut and fabric. High-street brands like Evans, Simply Be, and Torrid provide detailed size charts, which are essential when converting internationally.
Men's Clothing Sizes
Men's clothing sizing is simpler. UK and US sizes are mostly identical for shirts, jackets, and trousers.
However, differences can appear in casual wear or slim-fit garments. Always check chest and waist measurements before purchasing tailored or formal items. Online brands often list sizes in inches, which can help standardise conversions.
Quick Reference Chart
| UK Size | US Size |
| 34 | 34 |
| 36 | 36 |
| 38 | 38 |
| 40 | 40 |
| 42 | 42 |
| 44 | 44 |
| 46 | 46 |
Shoe Sizes: What You Need to Know
Shoe sizes are where shoppers most often get caught out. The UK and US systems differ more noticeably for women than men. Here's a handy chart:
For Women
| UK Size | US Size |
| 3 | 5 |
| 4 | 6 |
| 5 | 7 |
| 6 | 8 |
| 7 | 9 |
| 8 | 10 |
For Men
| UK Size | US Size |
| 6 | 7 |
| 7 | 8 |
| 8 | 9 |
| 9 | 10 |
| 10 | 11 |
| 11 | 12 |
Always try shoes on if possible or check the retailer's return policy. Shoe sizing can vary by style, brand, and material, so even accurate conversions aren't foolproof.
Practical Tips Before Buying
- Measure yourself first: Bust, waist, hips, chest, and foot length.
- Check brand guidelines: Sizes vary between brands.
- Read reviews: Customer feedback often mentions whether an item runs true to size or not.
- Consider fit intent: Oversized vs fitted garments require different sizing choices.
- Know return policies: International returns can be costly.
Common Mistakes to Avoid
- Assuming UK numbers are smaller or larger—it's just a different baseline.
- Ignoring measurement charts in favour of numbers alone.
- Forgetting vanity sizing in the US.
- Not accounting for stretch or fabric type in fitted garments.
Shop Internationally With Confidence
Shopping between the UK and US can be confusing, but knowing the basic rules for clothing and shoe conversions can save time and money. Keep in mind that these charts are approximate, and variations exist depending on brands and styles. Always double-check measurements, consult sizing guides, and when in doubt, order a size up or confirm the retailer's return policy.
With all these tips, you can confidently shop internationally and expand your wardrobe without worrying about fit.
