convertfig
USUKAU

EU 42 in AU Size

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

Try your own numbers

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.

AU size8
UK8
US men’s9
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

AUUKUSEUFoot (cm)Foot (in)
5563823.79.33
5.55.56.538.524.19.5
66739.524.59.66
6.56.57.540259.83
77840.525.410
7.57.58.541.525.810.16
8894226.210.33
8.58.59.542.526.710.5
99104327.110.66
9.59.510.54427.510.83
10101144.527.911
10.510.511.54528.411.16
11111245.528.811.33
11.511.512.546.529.211.5
1212134729.611.66
12.512.513.547.530.111.83
13131448.530.512
13.513.514.54930.912.16
14141549.531.312.33

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); Hush Puppies Australia: Shoe size conversion guide (AU women’s match US; AU men’s match UK); Williams Shoes: Size guide (Australian women’s sizes match US sizes, men’s align with UK sizes); Mountfords: Size guide (AU men’s the same as UK; AU women’s the same as US).

EU 42 in AU Size: the working

EU 42 is a men's AU 8, a foot of about 26 cm. Women's sizes are different, so choose the women's chart for those.

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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