UK to US Shoe Size Converter – Men, Women & Kids

UK and US shoe sizing systems use different scales. For men's shoes, a UK size is typically 1 full size smaller than the US equivalent (US = UK + 1). For women's shoes, the difference is usually 2 full sizes (US = UK + 2). For children's shoes, US sizes are generally 1 size larger than UK sizes (US = UK + 1), though this can vary for infants. These differences stem from historical measuring standards — the UK uses the barleycorn system (dating back to the 14th century), while the US adopted a modified version.

To convert UK men's shoe sizes to US men's sizes, simply add 1. For example, a UK men's size 8 equals a US men's size 9. A UK 10 converts to a US 11. This rule applies consistently across the full men's size range, including half sizes (UK 8.5 = US 9.5). However, always check individual brand size charts, as some brands like Nike or Adidas may have slight variations in their lasts and fits.

To convert UK women's shoe sizes to US women's sizes, add 2. For instance, a UK women's size 5 equals a US women's size 7. A UK 7 converts to a US 9. This 2-size difference is standard across most brands. Note that a UK women's size is also approximately 2.5 sizes smaller than the equivalent US men's size, which is helpful when shopping across gender categories.

For most children's shoes, add 1 to the UK size to get the US size (UK 5 = US 6). However, for infants and toddlers (UK sizes 0–3.5), some brands use a smaller offset of +0.5 (UK 2 = US 2.5). The children's sizing scale in the UK runs from 0 to 13.5 before transitioning to adult sizes. In the US, children's sizes also run to 13.5, then reset to 1 for youth/adult. Always measure your child's foot length in centimetres or inches for the most accurate fit, as age-based estimates can be unreliable.

No — the conversion formulas (Men +1, Women +2, Kids +1) are general guidelines, not absolute rules. Individual brands may deviate slightly due to their unique lasts (the mould used to shape the shoe). For example, Dr. Martens often fit larger, so you might need to size down. Nike running shoes tend to run small and narrow. Clarks uses its own measurement system that can differ from standard conversions. Always consult the specific brand's official size chart before purchasing, especially when buying online.

To measure your foot accurately at home: 1) Place a piece of paper on a hard floor against a wall. 2) Stand with your heel touching the wall and mark the tip of your longest toe. 3) Measure the distance in centimetres or inches. 4) Add about 0.5–1 cm (0.2–0.4 inches) for wiggle room. 5) Compare your measurement to a UK size chart: a foot length of ~25.4 cm (10 inches) typically corresponds to a UK men's 7 or women's 6. Measure both feet and use the larger measurement. Always measure in the evening when feet are slightly swollen for the most comfortable fit.

No — UK and EU sizing systems are completely different. The European system uses the Paris point (each size increment = 6.67 mm), while the UK system uses the barleycorn (each size increment = 8.47 mm). A UK men's 8 is approximately an EU 42, and a UK women's 5 is approximately an EU 38. The EU system does not differentiate between men's and women's sizes, making it a unisex scale. When shopping internationally, always cross-reference all three systems (UK, US, and EU) to ensure the best fit.

The difference stems from historical starting points. The UK system starts its adult scale at size 0 (approximately 8.67 inches / 22 cm foot length). The US men's system starts at a slightly different reference point, creating the 1-size offset. The US women's system was then developed with a further 1-size offset from US men's, resulting in the total 2-size gap between UK women's and US women's. This layered history explains why the conversion formulas differ by gender — it's not arbitrary but reflects the independent evolution of sizing standards in each country.