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Shoe Size Converter

Enter your size in the system you know — US men's, US women's, UK, European or Japanese — or your foot length in centimetres or inches, to see your size in every other system. A 25 cm foot is about UK 6.5, US men's 7.5, US women's 8.5 and EU 39.5. Brands can differ by a full size.

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How to use the Shoe Size Converter

  1. 1Choose the sizing system you know, such as US women's.
  2. 2Enter your size — or choose Foot length and enter a measurement in centimetres or inches.
  3. 3Read your estimated foot length and your size in every other system.
  4. 4Compare your foot length with the brand's own chart before buying, because sizes vary between makers.

How it works

Every sizing system is a scale laid over the length of a foot, with a different starting point and step. UK and US sizes go up in steps of a third of an inch, European (Paris point) sizes in steps of two-thirds of a centimetre, and Japanese and Mondopoint sizes simply state the foot length in centimetres or millimetres.

The converter turns your size into an estimated foot length, then works out the size in each other system from the standard relationships: UK ≈ 3 × foot length in inches − 23, US men's ≈ 3 × foot length − 22, US women's ≈ 3 × foot length − 21, and European ≈ 1.5 × foot length in centimetres + 2. UK, US and European results are rounded to the nearest half size.

These are the relationships the systems are built on, not any one brand's chart. Manufacturers use their own lasts and allowances, and some brand charts sit a full size away from these figures — which is why the estimated foot length is shown first: it is the most reliable number to compare with a maker's chart.

The formula

UK ≈ 3 × L(in) − 23 US men ≈ 3 × L(in) − 22 US women ≈ 3 × L(in) − 21 EU ≈ 1.5 × L(cm) + 2
L
foot length, in inches (in) or centimetres (cm)
1 inch = 2.54 cm

Results are rounded to the nearest half size. Individual brands can differ from these by up to a full size.

Worked example

A foot that measures 25 cm

  1. Choose Foot length and enter 25 cm.
  2. 25 cm is 9.84 inches.
  3. UK = 3 × 9.84 − 23 = 6.53, and EU = 1.5 × 25 + 2 = 39.5.

Result: UK 6.5, US men's 7.5, US women's 8.5, EU 39.5, Japan 25 cm, Mondopoint 250.

Tips and common mistakes

  • Measure your feet in the evening, when they are at their largest, and use the longer foot.
  • Compare your foot length with the brand's own size chart before buying; makers can differ by up to a full size.
  • Between two sizes, choose the larger for shoes worn with thick socks or for long walks.
  • Remember US men's and women's sizes are different scales; UK and European sizes are the same for everyone.

Frequently asked questions

How do I measure my foot length?
Stand on a sheet of paper with your heel against a wall, mark the tip of your longest toe, and measure from the wall to the mark. Measure both feet in the evening, when feet are largest, and use the longer one.
What is the difference between US men's and women's sizes?
For the same foot, a US women's size is one size larger than the men's size, so a men's 8 is roughly a women's 9.
Are UK and European sizes different for men and women?
No. UK, European, Japanese and Mondopoint sizes use one scale for everyone; only US sizing has separate men's and women's scales.
Does it cover children's sizes?
No. Children's scales start from different points in each country and are not described by these adult formulas.
What size is a 26 cm foot?
About UK 7.5, US men's 8.5, US women's 9.5, EU 41 and Japan 26 by the standard relationships. Check the brand's chart, which may differ.
What is Mondopoint?
A sizing system that states foot length in millimetres. It is used for ski boots and some military and work footwear.
Why do my shoes in the same size fit differently?
Each maker builds shoes on its own last, the foot-shaped form a shoe is made around, and adds its own allowance for toe room. That is why foot length is a more reliable guide than the size printed inside an old pair.
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