Shoe Size Converter

How to Measure Your Foot

• Measure in the evening — feet naturally swell slightly during the day, so an evening measurement matches real wearing conditions.
• Place a sheet of A4 paper on a hard floor against a wall. Wear the socks you intend to use with the shoes.
• Stand on the paper with your heel touching the wall, keeping your weight evenly distributed on both feet.
• Mark the tip of your longest toe (this is not always the big toe). Measure from the wall edge of the paper to the mark in centimeters.
• Repeat for both feet and use the larger measurement. Enter that value in the CM field above.

Why Sizes Differ Internationally

There is no universal shoe sizing standard. Each region developed its own system based on different historical units and conventions. The US uses a system derived from English barleycorns (1/3 inch per size). The UK uses a similar but offset system — UK sizes are typically about 1 size smaller than US men's. The European system (Paris point) measures in 2/3 cm increments of the shoe last, while Japan simply uses the foot length in centimeters.

Because these systems measure different things (foot length vs. shoe last length), converting between them is approximate. Women's and men's US sizes also use different numbering — a women's US 8 and a men's US 6.5 are roughly the same foot length.

Brand Variations

Even within one sizing system, shoes from different brands can fit quite differently. Nike running shoes often run about half a size small. Adidas tends to run slightly small in width. New Balance offers multiple widths (D, 2E, 4E) that affect fit more than length. European brands like Salomon and Asics may fit narrower. Always check the brand's own size guide and read reviews about fit before ordering online.

Tips for Online Shopping

• Always check the retailer's brand-specific size guide — generic charts can be off by half a size.
• Read customer reviews that mention "runs small" or "runs large" for that specific model.
• Order from retailers with free returns when trying a new brand for the first time.
• For online purchases, consider ordering two adjacent sizes if returns are free, then keep the better fit.
• Width matters as much as length — if your foot is wide, look for D, 2E, or 4E width options.

Frequently Asked Questions

Why are US men's and women's sizes different? US men's and women's shoe sizes use different numbering conventions. A women's US size is typically about 1.5 sizes larger than the equivalent men's US size for the same foot length. For example, a women's US 8 is roughly a men's US 6.5.

How accurate are these conversions? These conversions are based on standard industry reference tables and are accurate to within about half a size. Actual fit varies by brand, shoe last, and style, so always check the manufacturer's size guide when possible.

How do I measure my foot correctly? Stand on a sheet of paper in the evening (feet swell slightly during the day) while wearing the socks you plan to use. Trace around your foot, then measure the longest distance from heel to toe in centimeters. Measure both feet and use the larger value.

Is my data stored? No. All conversions run entirely in your browser. Nothing is transmitted or stored on any server.