Measure your foot in centimetres and see the corresponding shoe size in BR, EU, UK, US and Mondopoint — with ISO 9407 references.
Four numbering systems, four different scales, and none of them actually measures the foot. The European system advances by 6.67 mm per number (the Paris point, two thirds of a centimetre), the British and American systems by 8.47 mm (a third of an inch), and Mondopoint — the ISO 9407 standard — is the foot length itself in millimetres, no arithmetic needed. Because the steps are different, a one-to-one correspondence between the columns is impossible: it drifts, and two brands land a full size apart from each other without either being wrong.
Brazilian numbering uses the same Paris point as the European system, but without the built-in allowance the French convention assumes. ISO 19407 documents it: the French formula bakes in two points of slack between the toe and the shoe, the Italian one bakes in one, and the Brazilian one bakes in none. That is why BR 35 and EU 36 are often listed as equivalent even though they are on different rows of a strict conversion: the foot that fits both is the same, because the slack difference compensates the number difference. This page follows the commercial correspondence that Brazilian retailers publish, and says explicitly that it is a correspondence, not an equivalence.
The only objective input is the foot length. Everything else — the number on the box, the feeling of the shoe — depends on the brand, the model, the last shape and whether you measured at the end of the day with the right socks. This converter takes a centimetre measurement, maps it to the closest row of a chart built from ISO references and retail practice, and gives you five numbers to start with. Your measurements stay in your browser and the page works offline.
European: size = (foot length mm + 2 × 6.67) / 6.67. Brazilian: size = foot length cm × 1.5 (no slack). UK adult: (last length in − 25) × 3, with US male = UK + 1. Mondopoint = foot length in mm. The correspondence chart rounds these to the nearest commercial size.
Because the European convention builds in two points of slack between the foot and the shoe, and the Brazilian convention builds in none. The same foot ends up one number lower in Brazil. Most retailers absorb this into their chart, which is why BR 35 and EU 36 are often listed as "the same".
The ISO 9407 system: the shoe is marked with the foot length in millimetres, followed optionally by the foot width. Mondopoint 260 means a foot of 260 mm. It is the only system that is a measurement rather than a label.
No. The converter runs entirely in JavaScript on your device. Nothing is uploaded, stored or logged.
The one that matches how the shoe is labelled. US women's sizes run about 1.5 numbers higher than men's for the same foot: a woman's 8.5 and a man's 7 cover roughly the same length. This page shows both charts.
In the evening, standing, wearing the socks you would wear with the shoe. Feet swell throughout the day, and a morning measurement buys shoes that are tight by afternoon.
Because the number on the box is chosen by the brand, not dictated by a standard. The last shape, the target market and the commercial grade of the leather all change how a number fits. The foot length in centimetres is the only constant — compare it against the brand chart, not against the number.
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