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Size converter
Most converters give one answer and hide where it came from. This one gives up to three and labels each: the formula, the brands' own charts, and the people who wear both. Where they disagree, you see the disagreement instead of an average.
Shoe size converter
US, UK, EU and CM, and any brand to any other brand by the foot length each publishes.28 brand charts read from the brands' own guidesMen's shoe size converter
US men's, UK, EU and CM, the women's size of the same length, and any brand to any other brand from their own men's charts.9 brand charts read from the brands' own guidesBra size converter
UK, US, EU, FR and AU. Cups are counted along each brand's own letter order, because US brands disagree after DD.37 brand charts read from the brands' own guidesWomen's clothing size converter
Tops and dresses between US, UK, DE, FR, IT, AU, JP and letters, and brand to brand by the bust each brand cuts a size for.21 brand charts read from the brands' own guidesJeans size converter
Waist size, US numeric, letters and the European numbers, plus the body waist each brand really cuts a tag for.33 brand charts read from the brands' own guidesLeggings size converter
Letters, US numeric and the European numbers, and any brand to any other by waist and hip.41 brand charts read from the brands' own guidesTights size converter
No shared system exists: every brand draws its own height and weight grid. Convert brand to brand, or from your height and weight.19 brand charts read from the brands' own guidesMenswear size converter
Suit jackets and shirt collars by rule, and tops brand to brand by the chest each brand cuts a size for.21 brand charts read from the brands' own guidesRing size converter
US, UK letters, EU / ISO, Swiss and inner diameter. Ring sizes are defined by one measurement, so this conversion is exact.Formula only, sources named
Three answers, never blended
Source 1
Formula
The arithmetic that defines the systems: Paris points, barleycorns, a bust girth halved. Always available, and the least likely to match a real garment.
Source 2
Brand charts
What each brand prints on its own size guide, checked by hand against the brand's page. Shown for one brand, and tallied across all of them so you can see where brands split.
Source 3
Wearers
The sizes people who own both brands actually wear. Shown only once five different people stand behind an answer. Charts describe a garment; wearers describe a fit.
Nothing here is paid for. No brand can buy a better conversion, and a conversion never changes because of what a shop pays us. Read where we can be wrong.
Why the numbers disagree
- EU sizes are not one system6 minute read
- US to EU shoe size, brand by brand7 minute read
- UK vs US bra sizes: where the cups split6 minute read
- How shoe sizes are built: barleycorns, Paris points and centimetres6 minute read
- Men's to women's shoe sizes: the offset depends on the brand4 minute read
- Jeans waist size is not your waist: what each brand cuts a tag for5 minute read
- What size is a medium? The same letter, brand by brand5 minute read
- How tights sizes work: every brand draws its own grid5 minute read
- Bra sister sizes: the same cup on a different band4 minute read
- Shoe widths: what B, D, 2E and 4E mean for women and men4 minute read
Better than any conversion
Tell us one item you own and how it fits. We read that brand's chart, place you on it, and give your size at every other brand, with a confidence level on each.