Last updated: March 2026
Understanding Shoe Size Charts
Shoe size charts exist because the world never agreed on a single standard. The United States, United Kingdom, Europe, and Asia each developed their own numbering systems over centuries, and none of them map neatly onto the others. A shoe size chart is the Rosetta Stone that translates between these systems.
The most practical approach is to know your foot length in centimeters. The CM measurement is the universal constant — your foot is the same length regardless of which country's sizing system you use. Once you know your CM measurement, converting to any other system is a simple table lookup.
The average American man's shoe size is US 10.5, up from 9.5 in the 1970s. Women's average has similarly increased to about US 8. These shifts reflect changes in average height, weight, and also how brands size their products — so-called “vanity sizing” has made modern shoes slightly more generous than their equivalents from decades past.
How Shoe Sizing Systems Work
The US system (Brannock scale) is based on the Barleycorn unit, where each full size represents 1/3 inch (8.47mm) of shoe last length. Half sizes split the difference at about 4.23mm. Men's and women's scales are offset — women's sizes run about 1.5 numbers higher for the same foot length.
The EU system uses Paris Points, with each size representing 2/3 cm (6.67mm). EU sizes are gender-neutral, which is one of the system's strengths. However, EU sizing measures the shoe last rather than the foot, so there's typically about 1.5 cm of “functional allowance” built in.
The UK system is similar to the US system but uses a different starting point. Men's UK sizes run about 0.5 below US sizes (US 10 = UK 9.5), while women's UK sizes are about 2 below US (US 8 = UK 6).
Shoe sizing can vary by up to a full size between brands. A Nike US 10 fits differently than a New Balance US 10 because brands use different lasts, different toe box shapes, and may interpret standards differently. Always verify with the specific brand's chart when shopping online.
Tips for Using Shoe Size Charts
The best way to use a size chart is to start with your foot measurement in centimeters. This removes all the guesswork from brand-to-brand variation. Measure both feet (one is almost always larger), measure in the evening when feet are slightly swollen, and use the larger measurement.
When shopping internationally, always double-check whether a listed EU size is using the Continental European system or the UK system. Some British brands label their shoes with UK sizes that look similar to EU numbers, which can cause confusion. If a shoe comes from Italy, France, or Germany, it's almost certainly using the Paris Point EU system.
For children, plan to check sizing every 2–3 months. Kids' feet grow rapidly — up to a full size every 3–4 months for toddlers, slowing to about a size per year for school-age children. The EU system's continuous numbering (no reset between toddler and youth) makes tracking growth progress simpler.
Frequently Asked Questions
How do I read a shoe size chart?
Find the sizing system you know (e.g., US) in the chart header. Locate your size in that column, then read across the row to see the equivalent sizes in other systems. For example, if you're a US men's 10, the row shows UK 9.5, EU 44, 28 cm, and KR 280.
Are shoe size charts accurate across all brands?
Shoe size charts provide a general guideline based on international standards. However, actual fit varies by brand, shoe model, and last shape. Use the chart as a starting point, then check the brand's specific size guide. Trying shoes on remains the gold standard.
What's the difference between men's and women's shoe size charts?
Men's and women's charts use different scales. In US sizing, women's sizes run about 1.5 numbers higher than men's for the same foot length. A women's US 9 is approximately a men's US 7.5. EU sizes are gender-neutral, so a 40 is a 40 for everyone.
How often should I remeasure my feet?
Adults should remeasure annually. Feet can change size due to aging, weight changes, pregnancy, and medical conditions. After age 40, feet often widen and may lengthen slightly as arch support weakens. Always remeasure after significant life changes.
Do kids' shoe sizes differ from adult sizes?
Yes. Kids' shoe sizes use a separate scale that starts at size 1 for infants. US kids' sizes go up to about 13, then reset to 1 for youth/adult sizing. European sizes run continuously, which many parents find simpler to track as children grow.
What shoe size chart should I use for online shopping?
First, check if the retailer provides a brand-specific size chart. If not, use a general conversion chart like this one and select the CM measurement since it's the most universal. When in doubt, order the larger size — it's easier to add an insole than to stretch a shoe.