Shoe Size Calculator
Free Shoe Size Calculator for health & fitness. Enter your measurements for personalized results with clear explanations and reference ranges.
Medical disclaimer: This calculator is provided for educational and informational purposes only and does not constitute medical advice, diagnosis, or treatment. Results are general estimates and may not reflect your individual circumstances. Always consult a qualified healthcare professional before making decisions about your health.
Formula
EU ≈ US + 33 (men) | EU ≈ US + 31 (women)
The converter matches your input against a reference chart rather than applying a single equation, because no formula holds across all three systems. As rough rules: US men = UK + 0.5, US women = UK + 2, and EU is roughly US men + 33. European sizes are Paris points (2/3 cm each) measured on the last, not on your foot, so they are not a direct length. Foot length in centimetres is the one measurement that transfers between brands; sizing itself is not standardised, so treat any conversion as a starting point.
Worked Examples
Example 1: US to EU Conversion
Problem:Convert men's US size 10 to EU.
Solution:Using conversion chart: US 10 (men's) = EU 43 Alternative formula: EU ≈ US + 33 = 43 Actual may vary by brand.
Result:EU 43
Example 2: Foot Measurement
Problem:Foot measures 26.5 cm. What size for women?
Solution:Women's foot length chart: 25.8 cm = US 10 26.7 cm = US 11 26.5 cm sits just below US 11, and shoes should have about a thumb's width of room beyond the longest toe. Recommend: US 11 / UK 9 / EU 41
Result:US 11 (Women's)
Example 3: UK to US
Problem:Have UK 8 men's shoes. What US size?
Solution:US men's = UK + 0.5 US = 8 + 0.5 = 8.5 Or use chart: UK 8 ≈ US 8.5 / EU 42
Result:US 8.5
Frequently Asked Questions
How do I measure my foot for shoe size?
Stand on paper, trace your foot, measure from heel to longest toe in cm. Add 0.5-1 cm for comfort. Measure both feet—use the larger one. Measure in the afternoon when feet are largest.
What's the difference between US, UK, and EU sizes?
A US women's size is 2 larger than the UK number (US 8 = UK 6), and a US men's size is 0.5 larger than the UK number (US 9 = UK 8.5). European sizes use Paris points, where one point is 2/3 cm and the number describes the last rather than your foot, which is why EU numbers do not map cleanly onto either. Always check the brand's own chart.
Why do my shoes feel different in different brands?
There's no universal standard. Brands use different lasts (foot models), widths, and measurement methods. Italian brands often run narrow and small; American brands tend to run larger.
Should I size up or down between sizes?
Generally size up. It's easier to add insoles than stretch shoes. Consider the shoe type: athletic shoes need more room; dress shoes can be snugger. Account for socks you'll wear.
What is shoe width?
Width runs from AAA (narrowest) through D/M (medium) to EEE (widest). Men's D = standard. Women's B = standard. If shoes feel tight across the ball, you may need wider width.
Do feet change size over time?
Yes. Feet can grow wider and longer with age, weight changes, and pregnancy. Measure yearly. Many adults are wearing sizes too small from decades-old measurements.
How do children's sizes work?
US children's sizes run 0-13, then restart at adult 1. There's about 8mm per size. Kids' feet grow fast—measure every 2-3 months. Allow thumb-width room in toe box.
What's the difference between men's and women's sizing?
Women's US sizes are 1.5-2 sizes larger than men's. A women's 10 ≈ men's 8.5. Width differs too: men's D = women's wide. Some brands offer unisex sizing.
How do I convert EU to US size?
For men: EU - 33 ≈ US. For women: EU - 31 ≈ US. Example: EU 42 men's ≈ US 9. These are approximations; always verify with size charts.
Why do running shoes need extra room?
Feet swell during exercise and need space to flex. Running shoes should have a thumb's width (about 1 cm) between longest toe and shoe end. Consider going up half a size.
Background & Theory
Shoe sizing varies by region and brand. Understanding conversions helps when shopping internationally or online.
Sizing Systems:
US (American):
Based on modified barleycorn (1/3 inch)
Men's and women's sizes differ by ~1.5
UK (British):
Original barleycorn system
Men's = US - 0.5, Women's = US - 2
EU (European):
Paris Point system (2/3 cm per size)
Unisex sizing
CM/Mondopoint:
Direct foot length measurement
Most accurate system
Quick Conversions (CM is the men's foot length for that row; women's sizing runs about 1.5 sizes higher than men's for the same foot):
| US Men | US Women | UK | EU | CM |
|---|---|---|---|---|
| 8 | 9.5 | 7.5 | 41 | 26 |
| 9 | 10.5 | 8.5 | 42 | 27 |
| 10 | 11.5 | 9.5 | 43 | 28 |
Measuring Tips:
- Measure in afternoon (feet swell)
- Wear typical socks
- Measure both feet
- Add 0.5-1 cm for comfort
Width Guide:
Narrow: A, AA, AAA
Standard: B (women), D (men)
Wide: D (women), E, EE, EEE
The same letter means different things by sex: D is the standard men's width but a wide for women.