Is a women's size 4 big?

A US women's 4 fits a foot of about 20.3 cm, which is longer than under 1% of women's feet. That is a small foot for an adult; the size range starts near here.

What is a US women's 4 in EU and UK sizes?

A US women's 4 is about EU 32 and UK 2.5, for a foot of 20.3 cm (8.0 in). In US men's sizing the same foot is about 3. Brands round differently, so try before you trust.

How rare is a size 4 foot?

About 1 in 900 women have feet this short or shorter. Among men it is under 1 in 10,000.

Is a women's size 4 shoe big?

A US women's size 4 fits a foot of about 20.3 cm (8.0 in), longer than under 1% of women's feet. In EU sizing that is 32, in UK 2.5.

Percentile

<1%

of women have smaller feet than a women's 4

US women's 4 = 20.3 cm

US women's 4 by group

Foot length

Share of adults with feet shorter than 20.3 cm
Group	Mean	Smaller than you	1 in X
Women (about US women's 8.5)	24.0 cm	<1%	1 in 900
Men (about US men's 10.5)	26.5 cm	<1%	under 1 in 10,000

The same foot in other systems

Same conversion as the shoe size test; brands differ by up to half a size
System	Size
US women's	4
US men's	3
UK	2.5
EU	32
Foot length	20.3 cm
Foot length	8.0 in

Percentile is the share of the group with shorter feet than this size fits. “1 in X” counts the rarer side: people at or beyond this value above the median, at or under it below. The size is converted to foot length in cm, then compared with a normal distribution of foot lengths.

What this means

The average man's foot is 26.5 cm, about a US men's 10.5. The average woman's is 24.0 cm, about a US women's 8.5. A women's 4 is 3.7 cm shorter than the women's mean.
Measured against men, the same foot is longer than under 1% of them. In US men's sizing it is about 3.
Shoe sizes are not standardised. The same foot gets different numbers from different brands, usually by half a size, sometimes a whole one.

Questions

Is a women's size 4 big?: A US women's 4 fits a foot of about 20.3 cm, which is longer than under 1% of women's feet. That is a small foot for an adult; the size range starts near here.
What is a US women's 4 in EU and UK sizes?: A US women's 4 is about EU 32 and UK 2.5, for a foot of 20.3 cm (8.0 in). In US men's sizing the same foot is about 3. Brands round differently, so try before you trust.
How rare is a size 4 foot?: About 1 in 900 women have feet this short or shorter. Among men it is under 1 in 10,000.

Source: Foot length distributions: Jurca et al., Footwear Science 2019; Wunderlich and Cavanagh, Med Sci Sports Exerc 2001. Sizes converted with the same formula as our shoe size test. Percentiles on this page are our estimate from a normal distribution with the stated mean and SD.

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