Shoe Size Converter

Convert shoe sizes between US, UK, EU, and CM sizing for men, women, and children.

Tested tool guide Tested browser tools Checked August 16, 2026

What Shoe Size Converter does, with a checked example

Shoe sizes are regional conventions, not one universal measurement, and this tool translates between them with a standard reference table: US, UK, and EU numbers plus foot length in centimeters, on separate scales for men, women, and children. Pick the group, enter a size in any of the four systems, and read off the equivalents. The part that catches people out: the US-to-UK offset differs by group, so a US 9 is a UK 8 in men's but a UK 7 in women's, and the table is a common reference, not a promise about any one brand's labeling.

Worked example

A concrete input and expected output from the current implementation.

Input

Men's, US 9

Expected output

UK 8, EU 42, foot length 27 cm

US men's numbering sits one below the UK column (UK 8 for a US 9), 33 below the EU column (EU 42), and 18 below the centimeter column (27 cm), which is exactly the reference row for a US men's 9. Of the four figures, the EU value is the one most likely to differ on a brand's own chart, where 42.5 appears for this size.

How the result is produced

One table per group

Men's, women's, and children's sizing use different offsets, so the tool keys every conversion to the group you select. US men's sits one size ahead of UK (US 10 = UK 9), US women's two ahead (US 8 = UK 6), and children's renumber completely: a kids' size shares no number with the adult scales, and its charts vary more between countries than adult ones do.

Reference lookup, not a formula

The tool converts by reading a fixed conversion table rather than applying one arithmetic rule, because no official standard defines these equivalences. Half sizes slot between whole sizes, and the centimeter column records foot length (the Mondopoint approach), which is why the same labeled size can fit differently across brands: the US, UK, and EU numbers are labels with no standard behind them, while the centimeter figure measures the foot directly.

Good uses

A US-only retailer lists a pair in US sizes; convert that number to the UK or EU size you know you wear before ordering from abroad.
A parent measures a child's foot in centimeters and enters it to find the matching US, UK, and EU kids' sizes, since children's scales differ the most between countries.
A listing gives only Mondopoint centimeters, for example 270; enter it to see which US men's or women's size that corresponds to.

Limits and checks

Brands disagree. The table is a common reference, but brands grade their lasts differently and may label the same foot a half size apart (for example, EU 42 versus 42.5 for a US men's 9). Check the brand's own size guide before buying.
The group matters. US women's 8 and US men's 8 are different feet, since women's sizing runs about 1.5 sizes smaller, so converting without selecting the right group silently gives the wrong answer. Kids' sizes renumber completely and are the least consistent of all.
CM is foot length, not shoe length. The centimeter value follows the Mondopoint convention of measuring the foot, and shoes carry some internal room, so measuring a shoe's outsole and entering that number returns a larger size than the table intends.

Common questions

Is the converted size guaranteed to fit?

No. Sizing is a convention, not a standard, and every brand fits its lasts a little differently, so the result is a reference point, not a guarantee. Compare it with the brand's own size chart before ordering, and when your foot length in centimeters sits between two sizes, choose the larger one and check the brand's width guidance.

Why convert through centimeters when I can just match numbers?

Because US, UK, and EU numbers have no official definition tying them to a length, while the centimeter value follows the Mondopoint approach (ISO 9407) and measures the foot directly. That makes CM the anchor: converting via foot length is the most reliable way to compare across systems, and the most useful when you are between sizes.

References and verification

The example and behavioral notes were checked against the browser implementation. Standards and primary references below define the relevant format, formula, or platform behavior.