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Shoe & Clothing Size Converter

DataMath

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Size Conversion

Guide

Shoe & Clothing Size Converter

International size charts never agree. A men’s US 10 shoe is a UK 9.5, an EU 44, and a 28-centimeter footprint in Japan. A women’s US 6 top might map to a 34 in the EU, a 10 in the UK, and a small letter-sized S everywhere else. Rather than guessing, this converter uses the published ISO and industry lookup tables so you pick a category, select the size you already know, and see the equivalents across every major region instantly.

How to Use

Pick a category — men’s, women’s, or kids’ shoes; men’s or women’s tops; men’s or women’s pants by waist; or women’s bras (band or cup).
Choose the sizing system you’re familiar with (US, UK, EU, JP/CM, CN, or letter).
Select the size you normally wear from the dropdown — only valid sizes for the chosen category appear.
Read the instant breakdown. Your equivalent sizes appear at the top, and the full reference table highlights your row for context.

Features

Eight categories – men’s/women’s/kids’ shoes, men’s/women’s tops, men’s/women’s pants, women’s bra bands and cups.
Five sizing systems – US, UK, EU, JP/CM, CN, plus universal letter sizes for tops.
Half sizes supported – 6.5, 8.5, 10.5 on shoes map exactly to their regional equivalents.
Body-measurement columns – chest, bust, waist, and underbust in both inches and centimeters, so you can double-check against a tape measure.
Highlighted row – your chosen size lights up in the reference table so neighboring sizes are one glance away.
100% client-side – nothing leaves your browser; works offline after first load.

When to Use It

Shopping international sites where only the local sizing system is listed.
Reselling vintage or second-hand clothing tagged in a different region’s numbering.
Checking a relative’s size abroad before ordering a gift.
Translating brand size charts that use letter (S/M/L) sizing back to the numeric size you actually know.

 FAQ

Why do shoe sizes differ between regions?

Each region standardized its own system at different points in history. US and UK sizes originally used barleycorn units from 14th-century England (a third of an inch per size), but diverged when the US added half sizes and shifted its scale. EU (Paris Point) measures in 2/3-centimeter increments, while Japan and most of Asia use direct foot length in centimeters (the Mondopoint system). Because the underlying unit is different, no single conversion formula works — the correspondence is a lookup table.
Why is a US women's shoe size different from the same men's size?

In the US and UK, women's sizes are offset from men's by about 1.5 — a men's 8 and a women's 9.5 have roughly the same foot length. Europe, Japan, and China use a unisex numeric scale where the number reflects actual foot measurement, so the same foot gets the same number regardless of gender.
How is bra cup size actually determined?

Cup size is the difference between bust circumference (fullest point) and band size (underbust). Each inch of difference equals one cup step: 1″ is an A, 2″ is a B, 3″ is a C, and so on. US and UK cup letters stay in sync through D, but diverge at DD/E because the US adds doubled letters (DD, DDD) where the UK increments single letters (DD, E, F).
Are letter sizes like S/M/L standardized?

No. Letter sizes are brand-specific and vary by up to two numeric sizes between manufacturers. The letter columns in this converter reflect the most common industry groupings (e.g., women's M ≈ US 8–10), but always check the individual brand's size chart — especially for outerwear, activewear, and high-fashion labels where letter sizing drifts the most.