convertfig
USUKAU

EU 42 in US Men's

Men's US 9 = UK 8 = AU 8 = EU 42 (foot about 26.2 cm).

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Sizes for
Convert from

Half sizes are fine, for example 9.5.

Assumptions (editable)
cm

A shoe is longer than the foot inside it. The starting allowance is 1.7 cm for men, 1.2 cm for women and 1.5 cm for kids (an editorial figure fitted to the published charts). Leave the box blank to use it.

US men’s size9
UK8
AU8
EU42
Foot length26.2 cm (10.33 in)

Shoe length 27.94 cm (foot 26.2 cm plus 1.7 cm allowance). UK size = shoe length in inches × 3 − 25. EU size = shoe length in cm × 1.5, to the nearest half. US men’s = UK + 1; AU = UK.

Sizes vary by brand. If you are between sizes, size up or check the brand’s own chart.

Fig. 1 The size in every system.

Every formula is tested against worked examples. How we check

USUKAUEUFoot (cm)Foot (in)
6553823.79.33
6.55.55.538.524.19.5
76639.524.59.66
7.56.56.540259.83
87740.525.410
8.57.57.541.525.810.16
9884226.210.33
9.58.58.542.526.710.5
10994327.110.66
10.59.59.54427.510.83
11101044.527.911
11.510.510.54528.411.16
12111145.528.811.33
12.511.511.546.529.211.5
1312124729.611.66
13.512.512.547.530.111.83
14131348.530.512
14.513.513.54930.912.16
15141449.531.312.33

Fig. 2 Men's sizes in every system, in half sizes. Built from one rule set (see how it works); brands differ.

Last checked 11/11/2026. Sources: size.ly: International shoe size conversion chart for women and men (foot length, UK, US, EU; one-third inch steps; Paris point about 6.7 mm); size.ly: Kids shoe size chart (baby and children, US, UK, EU); RunRepeat: Shoe size conversion guide (UK does not separate men’s and women’s sizes; US does).

EU 42 in US Men's: the working

EU 42 is the size many European brands use as a men's medium-large. Check the brand's chart, because EU sizes are rounded differently by different makers.

Shoe length 27.94 cm (foot 26.2 cm plus 1.7 cm allowance). UK size = shoe length in inches × 3 − 25. EU size = shoe length in cm × 1.5, to the nearest half. US men’s = UK + 1; AU = UK.

Common questions

Is this the same in every brand?

No. Sizing is not standardised, so use this as a starting point. If you are between sizes, size up or check the brand’s own chart.

What foot length does it match?

About 26.2 cm.

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