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Convertitive

Shoe Size Converter — US / UK / EU / JP

One size in any system — see the equivalent in every other.

Shoe sizes don’t follow a single global standard. The US system uses Brannock-derived stepping starting from a quarter-inch baseline. The UK system is similar but offset by a half size from the US. The EU system uses Mondopoint — a metric scale measuring the last (the foot mould) in 2/3-centimeter increments. Japan quotes shoe size in centimeters directly. The widget below converts between all five, separately for men, women, and kids.

Equivalent sizes
  • US
    9
  • UK
    8.5
  • EU
    42
  • JP
    27
  • cm (foot length)
    27
Show full men’s conversion chart
USUKEUJPcm (foot length)
65.5392424
6.5639.524.524.5
76.5402525
7.5740.525.525.5
87.5412626
8.5841.526.526.5
98.5422727
9.5942.527.527.5
109.5432828
10.51043.528.528.5
1110.5442929
11.51144.529.529.5
1211.5453030
1312.5463131
1413.5473232

Conversion charts vary slightly by brand. The values above match the most common retail conversion tables; for an exact fit, always trust the manufacturer’s own chart and your measured foot length in centimeters.

How to use

  1. Pick your gender chart

    Men's, women's, and kids' use slightly different scales — particularly between US/UK on one side and EU/JP on the other.

  2. Tell the widget which system you know

    Choose 'US', 'UK', 'EU', 'JP', or 'cm', then pick your value from the dropdown. Only valid sizes for the selected gender appear.

  3. Read every other system

    The result card shows all five conversions side by side. The full chart is collapsed below — expand it to see the size you picked highlighted.

Frequently asked questions

Why are US and UK shoe sizes different?
Both systems trace to a 13th-century English standard, but the US split off in the late 1800s. US sizes are roughly half a size larger than UK at the same numeric value — a UK size 9 is about a US size 9.5 men's.
Is there a single 'correct' EU size for a US 9?
No. The EU 42 / 42.5 / 43 mapping varies a little by brand. Adidas, Nike, and New Balance each round half-sizes differently. The table here matches the most common retail conversion charts, but for an exact fit always check the manufacturer's own size guide.
What's Mondopoint?
An international standard (ISO 9407) that sizes shoes by the actual foot length in millimeters, rather than by an abstract scale. EU shoe sizes are derived from Mondopoint using the formula 'EU size = (foot length in cm × 1.5)'.
Why is my kids' US size suffixed with C or Y?
C = 'children' (toddler & little kid, sizes 0C–13C); Y = 'youth' (big kid, sizes 1Y–7Y). The numbering restarts at 1Y after 13C because the foot length scale crosses what would otherwise be sub-1 adult sizes.
How do I measure my foot in centimeters?
Stand on a piece of paper, mark the heel and the longest toe, measure the distance. Add ~5 mm of buffer for wiggle room. The cm column on the chart is the recommended interior length of the shoe, so your actual measured foot should be that minus the buffer.
Do shoe widths matter?
Yes — but they're a separate dimension. The US system uses letters (B narrow, D standard, E and EE wide, EEE extra-wide). EU and JP don't standardise width at all. This calculator handles only length.

About

Brannock device

The metal foot-measuring tool you've stood on at shoe shops since 1925. It measures length, ball-of-foot length (a slightly different number, used to choose half sizes), and width. Most US shoe sizing references it implicitly — when someone says 'I'm a US 9 D', they mean a Brannock 9 D.

When converters disagree

Charts on different retailer sites can differ by half a size. There's no central authority — each manufacturer publishes its own 'recommended conversion'. The values here are the consensus of major sportswear brands (Nike, Adidas, New Balance, Asics) and dress-shoe makers (Allen Edmonds, Crockett & Jones). For dress shoes, measure twice and order half a size up if in doubt.