Shoe sizes look standard but are not. A men’s size 9 is made for a foot about 10.3 inches (26.2 cm) long, and women’s, men’s, UK and EU numbers all differ. Underneath every system is one measurement, the length of the foot. This calculator starts from that measurement and returns the US men’s and women’s, UK and EU sizes from Nike’s published chart, together with the Mondopoint length and a formula cross-check.
How to use the shoe size calculator
- Measure your foot: heel against a wall, mark the longest toe, measure wall to mark.
- Measure both feet and use the longer one.
- Enter the length in centimetres, millimetres or inches.
- Read the sizes. The calculator chooses the first size on the chart whose foot length is at least yours.
Shoe size formula
US women’s size = US men’s size + 1.5 (Nike) · Mondopoint = foot length in mm
Paris points (EU) ≈ 1.5 × last length (cm)
The chart below is Nike’s men’s footwear table (retrieved 2026-10-15). Wikipedia’s Shoe size article gives the Brannock rule and the Paris point rule (EU size is one and a half times the last length in centimetres) and describes Mondopoint as the foot length in millimetres. The Brannock rule reproduces every row of Nike’s table to within a tenth of a size. Foot lengths are listed in sixteenths of an inch and the centimetre column is the inch value × 2.54.
| US men | US women | UK | EU | Nike cm / JP | Foot length (in) | Foot length (cm) |
|---|---|---|---|---|---|---|
| 3.5 | 5 | 3 | 35.5 | 22.5 | 8 1/2 | 21.6 |
| 4 | 5.5 | 3.5 | 36 | 23 | 8 11/16 | 22.1 |
| 4.5 | 6 | 4 | 36.5 | 23.5 | 8 13/16 | 22.4 |
| 5 | 6.5 | 4.5 | 37.5 | 23.5 | 9 | 22.9 |
| 5.5 | 7 | 5 | 38 | 24 | 9 3/16 | 23.3 |
| 6 | 7.5 | 5.5 | 38.5 | 24 | 9 5/16 | 23.7 |
| 6.5 | 8 | 6 | 39 | 24.5 | 9 1/2 | 24.1 |
| 7 | 8.5 | 6 | 40 | 25 | 9 11/16 | 24.6 |
| 7.5 | 9 | 6.5 | 40.5 | 25.5 | 9 13/16 | 24.9 |
| 8 | 9.5 | 7 | 41 | 26 | 10 | 25.4 |
| 8.5 | 10 | 7.5 | 42 | 26.5 | 10 3/16 | 25.9 |
| 9 | 10.5 | 8 | 42.5 | 27 | 10 5/16 | 26.2 |
| 9.5 | 11 | 8.5 | 43 | 27.5 | 10 1/2 | 26.7 |
| 10 | 11.5 | 9 | 44 | 28 | 10 11/16 | 27.1 |
| 10.5 | 12 | 9.5 | 44.5 | 28.5 | 10 13/16 | 27.5 |
| 11 | 12.5 | 10 | 45 | 29 | 11 | 27.9 |
| 11.5 | 13 | 10.5 | 45.5 | 29.5 | 11 3/16 | 28.4 |
| 12 | 13.5 | 11 | 46 | 30 | 11 5/16 | 28.7 |
| 12.5 | 14 | 11.5 | 47 | 30.5 | 11 1/2 | 29.2 |
| 13 | 14.5 | 12 | 47.5 | 31 | 11 11/16 | 29.7 |
| 13.5 | 15 | 12.5 | 48 | 31.5 | 11 13/16 | 30.0 |
| 14 | 15.5 | 13 | 48.5 | 32 | 12 | 30.5 |
| 14.5 | 16 | 13.5 | 49 | 32.5 | 12 3/16 | 31.0 |
| 15 | 16.5 | 14 | 49.5 | 33 | 12 5/16 | 31.3 |
| 15.5 | 17 | 14.5 | 50 | 33.5 | 12 1/2 | 31.8 |
| 16 | 17.5 | 15 | 50.5 | 34 | 12 11/16 | 32.2 |
| 16.5 | 18 | 15.5 | 51 | 34.5 | 12 13/16 | 32.5 |
| 17 | 18.5 | 16 | 51.5 | 35 | 13 | 33.0 |
| 17.5 | 19 | 16.5 | 52 | 35.5 | 13 3/16 | 33.5 |
| 18 | 19.5 | 17 | 52.5 | 36 | 13 5/16 | 33.8 |
| 18.5 | 20 | 17.5 | 53 | 36.5 | 13 1/2 | 34.3 |
| 19 | 20.5 | 18 | 53.5 | 37 | 13 11/16 | 34.8 |
| 19.5 | 21 | 18.5 | 54 | 37.5 | 13 13/16 | 35.1 |
| 20 | 21.5 | 19 | 54.5 | 38 | 14 | 35.6 |
| 20.5 | 22 | 19.5 | 55 | 38.5 | 14 3/16 | 36.0 |
| 21 | 22.5 | 20 | 55.5 | 39 | 14 5/16 | 36.4 |
| 21.5 | 23 | 20.5 | 56 | 39.5 | 14 1/2 | 36.8 |
| 22 | 23.5 | 21 | 56.5 | 40 | 14 11/16 | 37.3 |
Nike prints a separate women’s chart in which the UK and cm columns are half a size higher than on the men’s page for the same foot length, so check the product page if you rely on the cm column. The US, EU and foot-length values agree on both pages.
Worked example
A foot measures 26.5 cm (10.43 in).
- Men’s size 9 is made for a foot of 10 5/16 in (10.31 in), which is shorter than 10.43 in, so the next size, men’s 9.5 (10 1/2 in), is the first that fits: US men’s 9.5.
- US women’s: 11, UK 8.5, EU 43.
- Brannock check: 3 × 10.43 − 22 = 9.3, which rounds up to the same half size.
Tips for a good fit
- Thumb’s width: allow about a thumb’s width between the longest toe and the front of the shoe.
- Width: a wide foot may need a wide fit in the same length; Nike notes that wide shoes add about 1/4 inch of girth in the toe box.
- Time of day: measure late in the day, when feet swell.
- Different feet: it is common for one foot to be longer, so size to the longer foot.
To translate a size into other countries use the Shoe Size Converter (US/UK/EU/JP) or the Women’s to Men’s Shoe Size Converter converter, and for children the Kids Shoe Size Calculator. These are general guides, not fitted advice.
Sources
Every figure above comes from these pages, read directly on the dates shown. Brand names are used only to identify published charts.
- Nike — men’s shoes size chart (foot length, US, UK, EU, cm/JP) — checked 2026-10-15
- Nike — women’s shoes size chart (cross-check) — checked 2026-10-15
- Wikipedia — Shoe size (Brannock, Paris point, Mondopoint) — checked 2026-10-15
Frequently asked questions
How do I measure my foot for shoes?
Stand on a sheet of paper with your heel against a wall. Mark the tip of your longest toe, step off and measure from the wall to the mark. Measure both feet and use the longer one. Nike advises measuring in the afternoon and wearing the socks you will wear with the shoes.
What if my foot is between two sizes?
Nike recommends sizing up if the measurement falls between sizes, which is what the calculator does. If a shoe runs small in your experience, try the next half size as well.
What is Mondopoint?
Mondopoint, defined in ISO 9407, is simply the foot length in millimetres, so a 265 mm foot is Mondopoint 265. It is used on many boxes as a cm size and is the only system that is the same in every country.
What is the Brannock formula?
The Brannock device used in shoe shops assumes a men’s US size of 3 × foot length in inches minus 22. A 10 inch foot gives a size 8. The calculator shows it as a cross-check against the chart.
Do all brands use the same sizes?
No. This page reflects one brand’s chart, and another brand’s 9 can fit differently. Use the shoe-size-converter for other countries; see Shoe Size Converter (US/UK/EU/JP). If the brand publishes a chart, trust that chart.