Size Converters
International sizing, translated, rings, shoes and bras across US, UK, EU and more, plus measure-at-home guides. Body measurements are personal data: here they never leave your browser.
- Paper Size Converter A4 is 210 × 297 mm; US Letter is 215.9 × 279.4 mm, close, but not interchangeable, which is why a document laid out for one clips or leaves margins on the other.
- Ring Size Converter Ring systems measure the same thing differently: a US 7 is a UK N and an EU/ISO 54.4, all describing a 17.3 mm inner diameter.
- Shoe Size Converter A US men’s 9 is a UK 8, an EU 42.5 and a 26.5 cm foot, but brands vary, so foot length in centimeters is the only reliable ground truth.
- Bra Size Converter A US 34DD is a UK 34DD but an EU 75E and a FR 90E, band systems translate cleanly, cup letters diverge past D.
- Clothing Size Converter (Women) A US 8 dress is a UK 12, an EU 38, a FR 40, an IT 44 and a JP 13, six labels for one garment.
- Kids' Shoe Size Converter Kids' US sizes run 0C-13.5C then restart at 1Y-7Y, a US 10C is a UK 9, an EU 27, and fits a ~16.5 cm foot (age 3.5-4.5, typically).
- Hat Size Converter A 57 cm head wears a US 7⅛ fitted hat (UK 7), a size M, because fitted sizes are simply the head’s diameter in inches.
Why sizes never quite match
Clothing and accessory sizes are the least standardised numbers in everyday life: a US women's 8, a UK 12 and an EU 40 can all be the same dress, and shoe sizes shift by roughly a full size between US, UK and EU scales. Vanity sizing and brand-to-brand variation make the printed label only a starting point. These converters map between the common regional systems for ring, shoe, bra, clothing and hat sizes, so you can shop across borders with fewer returns.
The reliable approach is to measure and convert rather than guess: your foot length in millimetres, your ring's inside diameter, your band and cup measurements. Enter a measurement or a known size in one system and read off the equivalent in the others, instantly, and entirely in your browser.
Frequently asked questions
Why do clothing and jewelry sizes differ between countries?
Each region built its scale on different historical units, EU shoe sizes count Paris points, UK sizes count barleycorns, ring sizes range from US numbers to UK letters to ISO millimeters. The converters map between them using the standard published charts.
Are my measurements uploaded anywhere?
No. Body measurements are exactly the kind of personal data that shouldn’t touch a server. These tools run entirely in your browser, transmit nothing, and work offline.
How accurate are converted sizes?
Ring conversions are exact (all systems measure the same circumference). Shoe and bra conversions follow the standard charts, but manufacturers vary, the measurement-based inputs (foot length in cm, finger circumference in mm) are the most reliable route.