How to convert jean sizes

Written by dan chruscinski
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How to convert jean sizes
If you buy jeans in America, you will need to know their jeans sizes. (hilmi_m/iStock/Getty Images)

Clothing sizes differ from store to store, but an even greater divide is how other countries determine clothing sizes. Jeans in particular can be measured in inches, centimetres, or using the American size chart. Converting between the sizes can be done by either directly measuring the waist or using an equation to change between already established sizes.

Things you need

  • Calculator
  • Size tag of jeans

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  1. 1

    Find the size of the jeans. If you're converting from American jeans, the size with be an arbitrary number ranging from 00 to 16 with some variations for larger figured women. If you're starting with jeans from another country the size might be in inches or centimetres. Write the number down.

  2. 2

    Convert inches into centimetres by multiplying the number in inches by 2.54. For example, jeans that are listed as 29 inches would be converted to 74 centimetres. As a rule of thumb, if the size listed is over 60 the units are in centimetres. Less than 60 are generally inches.

  3. 3

    Convert the inches to American sizes by subtracting 21 from the size in inches. Jeans that are listed as a size 30 would be converted to a size 9.

  4. 4

    Reverse the conversion by adding 21 to a standard women's size. Having an American size of 4 would be converted to a size 25 if inches are the unit of measurement.

  5. 5

    Determine the size in inches (if needed) by dividing the size in centimetres by 2.54. A size of 63.5 centimetres would be 25 inches after conversion.

Tips and warnings

  • Much like in the UK, jeans of the same size can still have different fits. Keep this in mind when ordering jeans online or trying them on.

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