How do I convert a UK shoe size to US?

For men, the US size is roughly half a size larger than the UK size, so a UK 9 is about a US 9.5. For women the gap is larger, around two sizes, so a UK 5 is about a US 7. The chart uses the standard published conversions for each category.

Is measuring foot length more reliable than converting sizes?

Yes. Shoe size scales differ between brands and regions, but your foot length in centimetres is a fixed physical measurement. Measuring your longest foot while standing and matching it to the centimetre column gives the most reliable fit across any brand.

How are EU shoe sizes calculated?

EU sizes use the Paris point system, where each full size is two-thirds of a centimetre of last length. That is why EU numbers climb faster than UK or US numbers, and why EU sizes are roughly 33 to 34 for a small adult foot and 46 to 48 for a large one.

Why do men's and women's sizes differ for the same foot?

The US and UK systems offset women's numbering from men's. In the US a women's size is about 1.5 sizes higher than the men's size for the same foot length, while EU sizes are unisex and based purely on foot length, so they line up more directly.

What should I do if I am between two sizes?

Size up rather than down, especially for sports and walking shoes where feet swell during use. If one foot is larger, fit to the larger foot. Trying the shoe on late in the day, when feet are at their largest, gives the most realistic fit.

What is the Shoe Size Conversion Chart?

Reference table for men's, women's, and children's shoe sizes across UK, US, and EU standards, anchored to foot length in centimetres. Enter any size to find its equivalents instantly. It runs free in your browser on Gera Tools, with nothing uploaded.

Shoe Size Conversion Chart

Name: Shoe Size Conversion Chart
Creator: Gera Tools
License: https://creativecommons.org/licenses/by/4.0/

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Buying shoes across borders means juggling at least three numbering systems plus a physical foot length. This chart converts between UK, US, and EU sizes for men, women, and children, all anchored to foot length in centimetres so you can fit any brand reliably.

How the three systems work

The honest anchor is foot length, not the size number. EU sizes use the Paris point, where each full size equals two-thirds of a centimetre of last (internal) length — so EU numbers rise about 1.5 per centimetre of foot. UK sizes are built on the barleycorn (one-third of an inch, about 8.47 mm) and US sizes offset from UK by a fixed amount that differs by category: roughly +0.5 for men and +1.5 to +2 for women.

Because these scales were never designed to align perfectly, the tool uses curated standard conversion rows rather than a single live formula. Enter a UK, US, or EU size for an exact lookup, or enter a measured foot length in centimetres and the tool snaps to the nearest row.

Men’s size reference (adults)

UK	US	EU	Foot length (cm)
6	6.5	39–40	24.8
7	7.5	41	25.4
8	8.5	42	26.0
9	9.5	43	27.3
10	10.5	44–45	27.9
11	11.5	46	28.6
12	12.5	47	29.2

Women’s size reference (adults)

UK	US	EU	Foot length (cm)
3	5	36	22.2
4	6	37	23.5
5	7	38	24.1
6	8	39	24.8
7	9	40–41	25.4
8	10	42	26.0

Women’s UK and US sizes run about 1.5–2 sizes apart from men’s for the same foot length, which is exactly why EU sizing (unisex, length-based) translates most cleanly across genders.

How to measure your foot accurately

The most reliable way to find your size across any brand is to measure your actual foot length:

Place a sheet of paper on a hard floor.
Stand on the paper with your full weight (feet are longer under load than sitting).
Trace around your foot with a pencil held vertical.
Measure the longest distance — heel to the tip of the longest toe — in centimetres.
Measure both feet and use the larger measurement.
Match that centimetre figure to the nearest row in the table.

Measure in the evening: feet swell during the day, often by 5–8 mm, which corresponds to roughly half a shoe size.

When you fall between two sizes

Size up rather than down, especially for:

Running and sports shoes where feet swell during exercise
Boots or stiff leather shoes that do not flex much
Shoes with narrow toe boxes

A slightly long shoe can be adjusted with a heel grip or thicker insole. A shoe that is too short will cause blisters and long-term damage to toenails. All conversions here are a starting point — real fit still varies by brand last, width fitting (D/E/EE), and toe-box depth, which is why trying on when possible always beats converting by number alone.