Why don't US Men's and US Women's sizes just differ by a fixed number?

They're close to a consistent 1.5-size offset (a US Men's 9 is roughly a US Women's 10.5), but it's not exact across the whole range because the two scales were standardized separately and widths differ by design, not just a uniform shift. This tool uses a real reference chart rather than a single formula, so it stays accurate at both ends of the range.

Why do EU sizes jump by whole or half numbers unevenly?

EU (Paris point) sizing is based on the shoe's last length in two-thirds of a centimeter increments, rounded to practical production sizes — which is why the US-to-EU gap isn't perfectly linear and why some brands round differently at the half-size level.

Is centimeter (foot length) sizing more reliable than size charts?

Measuring your actual foot length in centimeters and matching it to a brand's specific size chart is the most reliable method, since "size 9" can vary by half a size or more between brands even within the same country's system. Use the cm column here as your most dependable anchor when shopping somewhere new.

Does this work for kids' shoe sizes?

No — this chart covers adult sizing only. Children's and youth sizing uses an entirely separate numbering scale that resets at a different point and isn't a simple offset from adult sizes.

SHOE SIZE CONVERTER

Convert between US, UK, EU, and centimeter shoe sizes, with a full reference chart.

Sizes are approximate — brands cut shoes slightly differently, so use this as a general starting point, not an exact fit guarantee.

Convert from

Size

US Men	US Women	UK	EU	CM
9	10.5	8	42.5	26.7

Full conversion chart

US Men	US Women	UK	EU	CM
6	7.5	5.5	39	24.1
6.5	8	6	39.5	24.4
7	8.5	6	40	24.8
7.5	9	6.5	40.5	25.4
8	9.5	7	41	25.7
8.5	10	7.5	42	26
9	10.5	8	42.5	26.7
9.5	11	8.5	43	27
10	11.5	9	44	27.3
10.5	12	9.5	44.5	27.9
11	12.5	10	45	28.3
11.5	13	10.5	45.5	28.6
12	13.5	11	46	29.4
13	14.5	12	47	30.2
14	—	13	48	31

How to convert a shoe size

1
Pick the sizing system your size is in: US Men's, US Women's, UK, EU, or foot length in centimeters.
2
Type the size you know.
3
Read the matching size across every other system, or expand the full chart to browse every size at once.

Questions

Why don't US Men's and US Women's sizes just differ by a fixed number?: They're close to a consistent 1.5-size offset (a US Men's 9 is roughly a US Women's 10.5), but it's not exact across the whole range because the two scales were standardized separately and widths differ by design, not just a uniform shift. This tool uses a real reference chart rather than a single formula, so it stays accurate at both ends of the range.
Why do EU sizes jump by whole or half numbers unevenly?: EU (Paris point) sizing is based on the shoe's last length in two-thirds of a centimeter increments, rounded to practical production sizes — which is why the US-to-EU gap isn't perfectly linear and why some brands round differently at the half-size level.
Is centimeter (foot length) sizing more reliable than size charts?: Measuring your actual foot length in centimeters and matching it to a brand's specific size chart is the most reliable method, since "size 9" can vary by half a size or more between brands even within the same country's system. Use the cm column here as your most dependable anchor when shopping somewhere new.
Does this work for kids' shoe sizes?: No — this chart covers adult sizing only. Children's and youth sizing uses an entirely separate numbering scale that resets at a different point and isn't a simple offset from adult sizes.