Chinese shoe listings often look simple because the label resembles an EU number, but the best check is still foot length in centimeters. That matters for adults, kids and marketplace shoes with uncertain brand charts.
Quick answer: convert the CN label, then compare the listed insole or foot length with your measured foot before buying.
A Chinese shoe listing may show CN 40, CN 42 or CN 45. In many retail contexts those labels sit close to EU sizing, which is why a quick converter can estimate the nearest US and UK size. But shoe fit depends on the inside length, toe shape, width and brand last.
For that reason, China Converters shows foot length next to the converted US size. If a product page provides a measurement in centimeters, that number should usually carry more weight than the label alone.
Stand on paper, mark the heel and longest toe, then measure the distance in centimeters. Measure both feet and use the larger one. For kids, add growth room and check the seller's chart because children can outgrow shoes quickly.
When the listing says "insole length", treat it as the inside shoe length, not the exact foot length. A shoe normally needs a little extra room. Tight dress shoes, sandals and winter boots may need different allowances.
Start with the Chinese shoe size to US converter, then compare foot length in centimeters.
Use the Chinese kids shoe size chart because child size ranges do not map like adult shoes.
If you only know your US size, use US shoe size to Chinese and then confirm the centimeter length.
A converter helps you get oriented quickly. The final decision should come from the product chart and your own measurement.