# Shoe Size Converter

> Convert adult shoe sizes between UK, US men’s, US women’s and EU, or find your size from foot length in cm or inches, using the standard sizing formulas.

Category: Everyday tools · Applies to: Worldwide · Last updated: 2026-10-29
Interactive calculator: https://calculators.geekmidst.com/calculators/shoe-size-converter

Shoe sizing systems are all based on length, just with different units and starting points. Enter your foot length, or a size you know, to see the matching size in each system.

Also called: Shoe size chart, Shoe size conversion calculator.

## Inputs
- Start from (options: Foot length, A shoe size; default foot)
- Foot length (heel to longest toe) (default 27)
- Measured in (options: cm, inches; default cm)
- Sizing system (options: UK, US men’s, US women’s, EU (Paris points), Mondopoint (mm); default uk)
- Size (default 8)

## Results
- UK
- US men’s
- US women’s
- EU
- Mondopoint (foot length)
- Foot length
- Foot length

## Formula

```
UK ≈ 3 × foot (in) − 23;  US men ≈ 3 × foot (in) − 22;  US women ≈ 3 × foot (in) − 21;  EU ≈ 1.5 × foot (cm) + 2;  Mondopoint = foot length in mm
```

Where:
- foot: heel-to-toe foot length; the shoe’s last is about 1.5 cm longer, which the constants already allow for

## Worked example
1. 27 cm ÷ 2.54 = 10.63 in.
2. UK = 3 × 10.63 − 23 = 8.89, rounded to the nearest half size: 9. US men’s adds 1 (10); US women’s adds 2 (11).
3. EU = 1.5 × 27 + 2 = 42.5. Mondopoint is the foot length in millimetres: 270.

**Result:** A 27 cm foot is about UK 9, US men’s 10, US women’s 11 and EU 42.5.

## What the result means

Treat the result as a starting point. Brands size their lasts differently, so the same foot can be an EU 42 in one brand and a 43 in another; check the brand’s own chart when it gives one.

## Assumptions and limits
- Adult sizes. Sizes are rounded to the nearest half size.
- US women’s uses the scale two sizes above UK; some brands use US men’s + 1.5 instead.
- Width is not considered.
- Children’s sizes use different scales and are not covered.
- Brand and style (boots, running shoes, high heels) change the fit.

## Questions

### How do I measure my foot?

Stand on a sheet of paper with your heel against a wall, mark the tip of your longest toe and measure from the wall. Measure both feet in the evening and use the longer one.

### Why is a UK size smaller than the US size?

Both count in barleycorns (⅓ inch), but the scales start from different points: US men’s is one size above UK, and US women’s is usually two above.

## Sources
- [Wikipedia — Shoe size (sizing system formulas)](https://en.wikipedia.org/wiki/Shoe_size)

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Source: GM¹X CalcVerse — https://calculators.geekmidst.com/calculators/shoe-size-converter