Use the conversion chart for the retailer, department and item you are buying. Then compare the measurements. A number or letter can mean different things across markets, and a universal conversion cannot confirm the fit of a particular garment.
Identify the sizing system before converting
| Label you see | Check before comparing |
|---|---|
| US, UK or EU numbered size | Which regional column and clothing department the number belongs to |
| XS, S, M, L or XL | The measurement ranges defined by this retailer |
| Waist and inseam, such as 30 / 32 | Units, the meaning of each number, and the retailer's fit notes |
| Petite, tall or plus collection | The chart for that collection, including lengths and proportions |
| A local numeric label, such as 95 or 100 | The local retailer's definition; do not infer an international letter size |
A published conversion example: ASOS women's clothing
These selected rows come from the international conversion table on ASOS's women's dresses guide. The guide applies to ASOS own-brand clothing. Use this as a scoped example of how regional labels correspond, then check the body measurements and product details for your item.
| US | UK | EU |
|---|---|---|
| 4 | 8 | 36 |
| 6 | 10 | 38 |
| 8 | 12 | 40 |
| 10 | 14 | 42 |
Source: the ASOS women's dresses guide linked under Sources & review. These conversions do not establish equivalent fit across other brands, men's clothing or shoes.
A reliable way to compare two retailers
A conversion displayed by one retailer is not evidence that every other brand uses the same measurements. Follow the current chart linked from the item rather than a table copied without context.
- Open both product pages in the market you will order from.
- Find the charts for the same department and garment category.
- Compare the actual body ranges or garment dimensions, keeping those chart types separate.
- Convert units if needed, and check length and fit notes before selecting a label.
- Keep a record of the product and chart you used. Another item with the same label may have a different cut.
Convert measurements, then compare
Suppose one chart lists a garment chest circumference of 40 inches and another lists 102 centimetres. Forty inches equals 101.6 centimetres, so those listed dimensions are close. This example compares a measurement, not a US or EU size label.
It still does not establish that the garments fit alike. Shoulder shape, sleeve position, stretch and the measuring method can differ. For a flat-width chart, convert the width itself first; do not silently treat it as a full circumference.
The figures above are an illustrative unit-conversion example, not brand sizing data.
Before placing an international order
Check the size label on the order confirmation, the retailer's market setting, and the return conditions for that purchase. Use the manufacturer's measurements to resolve a label mismatch instead of assuming that your usual M or numbered size transfers unchanged.
If you cannot find a relevant measurement chart, ask for it. FitPreview can explain comparisons from supplied information, but cannot turn an unknown international size label into a verified garment measurement.
Convert inches and centimetres
Change measurement units before comparing charts. Clothing size labels such as M, US 8 or EU 40 cannot be converted here.
Common questions
Is a US medium the same as a UK or EU medium?
Not reliably across brands and collections. Compare the measurement ranges or actual garment dimensions used by the retailer for those labels.
Can I convert my usual size without measuring anything?
You can use the retailer's conversion as a starting point, but it does not confirm personal fit. Measurements from your body or a comparable garment give you a stronger basis.
Sources & review
Official references checked on . Follow the current product page if its instructions differ.
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