Shoe size converter (BR, EU, US, UK)

The base is the foot length. The European scale uses the Paris point: EU ≈ 1.5 × (foot + 2 cm) of ease. The others derive from it: BR ≈ EU − 2, US men ≈ EU − 33, UK ≈ US − 0.5.

Why conversions are approximate

Shoe sizing is not standardised across brands, and the conversion tables everyone uses are conventions rather than measurements. Two shoes marked US 9 from different manufacturers routinely differ by several millimetres of internal length — which is why a size that fits perfectly in one brand can be half a size off in another.

There is a second variable no chart captures: width. US sizing has letter widths (B, D, EE); most European sizing does not, so a foot that is broad for its length tends to need a longer shoe there, distorting the conversion.

How to measure your foot properly

• At the end of the day. Feet swell through the day, by up to half a size.
• Standing, with weight on the foot, and wearing the sock you would use with the shoe.
• Measure both feet and use the larger. Asymmetry of a few millimetres is common and normal.
• Heel against a wall, mark the longest toe — which is not always the big toe.