Size converters

Shoe, ring and clothing sizes for US, UK and EU. Every tool below is free, works instantly in your browser and explains the formula behind the result.

Shoe, ring and clothing sizes follow different systems in the US, UK and Europe, and the steps between sizes are not the same. These converters use standard equivalence charts and show the underlying measurements, such as foot length and ring diameter, so you can buy with confidence from another country.

10 tools in this category

Shoe Size ConverterConvert shoe sizes between US, UK and European systems for men and women, and see the matching foot length.
Ring Size ConverterConvert a ring size between US numbers, UK letters, European (ISO) circumference and inside diameter.
Clothing Size ConverterConvert clothing sizes between the US, UK and Europe for women's dresses and tops, men's suits and jackets, and men's dress shirts.
Tire Size ConverterDecode a metric tire size into inches and compare it with another size to see the diameter difference and speedometer effect.
Bra Size ConverterConvert a US bra size to UK, European, French/Spanish and Australian sizes.
Hat Size ConverterMeasure your head and convert it to fitted hat sizes in the US, UK and Europe, plus letter sizes.
Glove Size ConverterMeasure around your hand and convert it to glove sizes — numeric (6–11), EU and letter sizes S to XXL.
Kids Shoe Size ConverterConvert children’s shoe sizes between US toddler (C) and youth (Y) sizes, UK and EU — or find a size from foot length.
Knitting Needle Size ConverterConvert knitting needle sizes between the US system, metric millimeters and the old UK/Canadian numbering.
Crochet Hook Size ConverterConvert crochet hook sizes between metric millimeters and US letter-number sizes such as H-8 and J-10.

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