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Shoe size converter

Convert US, UK and EU shoe labels using Nike's men's or women's footwear chart.

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Answer

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Convert US, UK and EU shoe labels using Nike's men's or women's footwear chart.

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Precision and calculation record
Rounding changes displayed numbers, not the calculation. Text, fractions, matrices and CSV schedules keep their own formatting. Automatic keeps up to 12 significant digits, with money shown to cents where applicable.
Saved scenario
Save the current answer, then change an input to compare. This clears when you leave.
Formula and assumptions
These are Nike label mappings, not universal shoe-size formulas. Choose the chart for the shoe you are buying. Other brands and individual styles can fit differently; this lookup does not measure your foot or choose a width. Some labels match more than one row, and all those matches are shown. Unlisted sizes are rejected rather than interpolated. For feet measured in centimeters, use the manufacturer's foot-length chart, not a shoe-box CM label.
Automatic precision shows numbers to 12 significant digits. Thousands separators such as 1,000 are accepted; use a dot for decimals.
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Updated 
Using Shoe size converter
Convert US, UK and EU shoe labels using Nike's men's or women's footwear chart.
These are Nike label mappings, not universal shoe-size formulas. Choose the chart for the shoe you are buying. Other brands and individual styles can fit differently; this lookup does not measure your foot or choose a width. Some labels match more than one row, and all those matches are shown. Unlisted sizes are rejected rather than interpolated. For feet measured in centimeters, use the manufacturer's foot-length chart, not a shoe-box CM label.
Next: Length converter
Next: Ring size converter
A worked example
Nike's men's chart maps US 9 to UK 8 and EU 42.5. UK 6 appears twice, at US 6.5 / EU 39 and US 7 / EU 40, so the converter preserves both possibilities.
Before you use the result
These are Nike label mappings, not universal shoe-size formulas. Choose the chart for the shoe you are buying. Other brands and individual styles can fit differently; this lookup does not measure your foot or choose a width. Some labels match more than one row, and all those matches are shown. Unlisted sizes are rejected rather than interpolated. For feet measured in centimeters, use the manufacturer's foot-length chart, not a shoe-box CM label.
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ToolOctopus. “Shoe size converter.” Updated 2026-10-03. https://tooloctopus.com/shoe-size-converter.
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