How do I convert International to UK clothing size?

Use the size chart above — find your {fn} size in the left column and read the {tn} equivalent on the right. Remember that sizes are approximate and vary by brand.

Is International size the same as UK size?

No — {fn} and {tn} use different sizing systems with no direct numeric equivalence. The chart above shows typical correspondences, but always check brand-specific size guides before purchasing.

Why don't clothing sizes match between countries?

Each country developed its own sizing system independently. The US uses numeric sizes (0, 2, 4...) for women; the UK uses numbers 4 sizes higher; the EU uses larger numbers based loosely on centimeter measurements.

Do men's and women's sizes convert the same way?

No — men's and women's sizes are completely separate systems even within the same country. Men's {fn} sizes do not correspond to women's {fn} sizes.

What does 'vanity sizing' mean?

Vanity sizing refers to the trend of labelling larger garments with smaller size numbers over time. A US size 8 from 2020 is typically larger than a size 8 from 1970, meaning the same number fits a larger body.

Is this International to UK converter free?

Yes. Unitafy is completely free, requires no registration, and works on any device.

Should I always try clothes on?

Yes — size charts are guides only. The same size label varies between brands, cuts, fabrics, and manufacturing batches. Always check retailer return policies when buying internationally online.

👕 International to UK Size Converter

International to UK clothing size.

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FormulaVaries by size

Quick Reference — Women's Tops

XS→6

S→8

M→10-12

L→14-16

⚠ Sizes vary by brand and garment. Use as a starting point — always check brand size guides.

Size Examples

Women's XS

International: XS → UK: 6

Smallest standard women's size.

Women's M

International: M → UK: 10-12

Most common women's size range.

Men's M

International: M → UK: M

Most common men's size — but US/EU/UK differ.

Women's XL

International: XL → UK: 18-20

Plus size range begins here in most brands.

International to UK Size Chart

Approximate equivalents — sizes vary by brand. Always check brand-specific guides.

Women's Tops

International	UK
XS	6
S	8
M	10-12
L	14-16
XL	18-20
XXL	22

Men's Tops

International	UK
XS	XS
S	S
M	M
L	L
XL	XL
XXL	XXL

Quick Sizing Tips

Use INT labels as bridge

XS/S/M/L/XL/XXL are the most universal — start here and check regional charts.

Women's vs Men's

Women's INT sizes (XS=0-2 US) are much smaller than men's INT sizes (XS=28-30 chest).

Try before buying

If shopping internationally, size charts are starting points — always check return policies.

Who Uses This Converter?

Online Shopper

Converts International size to UK size when buying clothing from international retailers.

Traveller

Finds the right UK size equivalent when shopping abroad.

Gift Buyer

Converts a known clothing size to the recipient's local size system.

Fashion Retailer

Adds size conversion charts to product listings for international customers.

Personal Stylist

Helps clients navigate sizing when sourcing from international designers.

Returns Department

Converts reported sizes to process international returns correctly.

Related Converters

US to EU US to UK EU to US EU to UK UK to US UK to EU International to US International to EU Shoe Size Converter All Clothing Size Converters

Frequently Asked Questions

About International and UK Sizing

International Sizes

International (INT) sizes use letter codes (XS, S, M, L, XL, XXL, XXXL) that transcend regional numbering systems. They are the most universally understood sizing system and are used by global brands for simplified labelling.

INT sizing is used by sportswear brands (Nike, Adidas, Under Armour), fast fashion (H&M, Zara), and workwear. The mapping to regional sizes is approximate — an INT 'M' is US 4-6, UK 10-12, EU 38-40 for women.

Interesting fact: The same INT label 'M' fits a different body in different categories: a women's M is much smaller than a men's M. This is why unisex sizing often 'runs small' for women — it's sized for male bodies with the INT label applied broadly.

UK Sizes

UK clothing sizes traditionally run 2 sizes above US women's sizes (US 8 ≈ UK 12). UK men's sizes largely match US sizes in letters (S/M/L/XL) but differ for trousers (waist in inches vs US waist/length). UK children's sizing uses age.

UK high street brands like Marks & Spencer, Next, and ASOS have contributed to defining UK sizing conventions. Like the US, UK sizing is not nationally standardized and varies significantly by brand and decade.

Interesting fact: UK women's size 10 is a US size 6 and an EU size 38 — all referring to similar body measurements but using incompatible numbering systems. This is why online international shopping generates so many size complaints.

About International to UK Clothing Size Conversion

Clothing sizes are not internationally standardized. International and UK sizes use different scales — the same body measurement corresponds to different size numbers in each system. Women's US sizes run 2–4 numbers below UK; EU sizes use larger numbers based on body measurements in cm. Men's sizing is more consistent in S/M/L/XL across regions, but numeric trouser sizes differ.

Always treat size conversions as a starting point. Brand-specific size guides, body measurement charts, and checking retailer return policies are essential for international online shopping.