Shoe Size Converter

Convert between US men's, US women's, US kids', UK, EU, JP, and Mondopoint shoe sizes. Type a foot length in centimetres or inches and see the size in every system — or pick a size in one system and see every other. Bulk mode accepts one size per line and exports TSV or JSON. Pure client-side, no upload, no tracking.

Reference table

The full ISO 19407 / Brannock table the lib maps against. Foot length in millimetres; the rest are the size that foot length corresponds to in each system.

cm in US M US W UK EU JP US K
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How the systems compare

Shoe sizing is a historical mess: every country picked its own anchor point in the 19th century and the standards drifted apart. The table above is the ISO 19407:2015 / Brannock-device-derived standard — close enough to ask the right size in a foreign shop, not close enough for orthotics.

Mondopoint (mm)
The actual foot length in millimetres. ISO 9407:2015. The one scale that does not lie.
US Men's (Brannock)
The Brannock device scale, 0.5 steps. Foot length 25.5 cm = US M 4. The same row the US shoe box uses for men's shoes.
US Women's
Same Brannock device, ~1.5 sizes below the equivalent men's row. Foot length 25.5 cm = US W 5.5.
UK (BS 4980)
British / Irish / Australian / Indian. Whole or half steps. Same row for men and women. UK 7 ≈ US M 7.5.
EU (Paris Points)
Continental European. Whole or half steps, 2/3 cm apart. EU 42 ≈ US M 8.5.
JP / cm
Japanese. The number is roughly the foot length in centimetres. JP 26 ≈ foot 26 cm.
US Kids' (Brannock)
US children's / youth scale. Covers feet shorter than ~21.5 cm; the children's shoe is a different product from the adult's.

The lib, the page, and the reference table are all derived from a single source-of-truth row per foot length. The "Redraw" or "Convert" buttons never re-roll a random number — the same input always gives the same answer.