Shoe Width Converter

Shoe width conversion translates foot width measurements between the different labeling systems used by shoe manufacturers. While shoe length (size) is the most commonly known measurement, shoe width is equally important for a proper, comfortable fit. Width is typically measured in millimeters at the widest part of the foot (across the ball) and is labeled with letters or combinations of letters in the US, UK, and EU systems.

The US width system uses letter designations that differ between men's and women's shoes. For men, the standard (medium) width is D, while for women it is B. Widths range from AAAA (extra extra narrow) through D/B (standard) to EEEE (extra extra wide). The UK system uses different letters (H is standard for men, E for women), and the EU system has its own letter codes that do not always correspond directly.

Finding the correct width is crucial because an improperly fitting shoe can cause blisters, bunions, hammer toes, and chronic foot pain. Studies show that approximately 60–70% of people wear the wrong shoe width, often because they only consider length. This converter helps you find your correct width by entering your foot measurement in millimeters or by selecting a known width and seeing its equivalents across all three sizing systems.

Shoe width is measured at the widest point of the foot (across the metatarsal heads, commonly called the ball of the foot). Each width designation corresponds to a specific range of foot widths in millimeters.

Men's and women's width designations differ because their feet have different typical proportions:

Find your correct shoe width:

1. Select Gender: Choose Men's or Women's to see the appropriate width chart.
2. Enter Foot Width: Type your measured foot width in millimeters (measure at the widest part of your foot).
3. Or Select a Width: If you already know your US width, select it from the dropdown to see equivalents in UK and EU systems.
4. View Results: See the width conversion across all three systems and the recommended width based on your measurement.

The width chart below the calculator shows all available widths with their mm ranges. Click any row to select that width and see its full conversion profile.

Online shoe purchasing is the most common reason for width conversion. Most online retailers default to standard widths, but many people need wider or narrower options. Knowing your width in the retailer's system prevents the frustration of receiving shoes that are too tight or too loose, even if the length is correct.

Medical and orthopedic needs require accurate width measurement. Conditions like bunions, hammertoes, diabetes-related foot swelling, and plantar fasciitis often require shoes in specific widths. Medical professionals recommend measuring foot width regularly because it can change over time due to aging, weight changes, and pregnancy.

Athletic performance depends on proper shoe fit. Running shoes that are too narrow cause blisters and black toenails, while shoes that are too wide allow the foot to slide, reducing stability and increasing injury risk. Many athletic brands now offer shoes in multiple widths (narrow, standard, wide, extra wide) to accommodate different foot shapes.