US Men / US Women: The two standard American sizing systems. Women's sizes typically run 1.5 sizes higher than men's for the same foot length (e.g., a Men's 8 ≈ Women's 9.5).
UK: British sizing runs roughly 0.5 below US Men sizes. Australian sizing generally matches UK sizing.
EU: European sizes use the Paris point system, where each size equals ⅔ cm of last length. EU sizes range from about 36 to 50 for adults.
CM / Japan: Both measure foot length in centimeters. Japanese sizing (Mondopoint) maps directly to centimeter length, making it one of the most precise systems.
China (CN): Chinese sizes are based on millimeters of foot length, typically displayed without the decimal (e.g., 265 = 26.5 cm).
How This Calculator Works
You enter a shoe size and select the sizing system it belongs to. The tool looks up the corresponding US Men's size from a master conversion table using linear interpolation, then converts that anchor value to all nine systems. It rounds to the nearest half size for most systems and to the nearest whole number for China and Mexico. Sizes outside the table range are matched to the closest known entry.
Quick Questions
Why don't my shoes match the converted size exactly?
Shoe sizing varies between brands, styles, and even production runs. This converter gives the standard industry equivalent, but your actual fit may differ by a half size depending on the manufacturer's last shape and width.
What is the difference between US Men's and US Women's sizing?
US Women's sizes are approximately 1.5 sizes higher than US Men's for the same foot length. So a Men's 7 is roughly a Women's 8.5. The underlying foot measurement is the same.
How do I measure my foot in centimeters?
Stand on a piece of paper, mark the heel and the tip of your longest toe, then measure the distance between the marks in centimeters. Measure both feet and use the larger measurement. Do this at the end of the day when feet are slightly larger.
Is Australian sizing the same as UK sizing?
For men, Australian and UK sizes are generally the same. For women, Australian sizes may differ by 1–2 sizes from UK depending on the brand. This converter treats them as equivalent for simplicity.
Sources
Wikipedia — Shoe Size (overview of international sizing systems and Paris point formula)