Size conversion charts are tools that help individuals understand the differences between various sizing systems used in clothing, shoes, and other products. These charts typically display measurements in different units, such as inches, centimeters, or US sizes compared to European sizes. They are particularly useful for online shopping, where customers may encounter unfamiliar sizing standards. These charts can also assist in converting sizes across different categories, such as men's, women's, and children's clothing. By providing a clear reference, size conversion charts help ensure a better fit and reduce the likelihood of returns due to sizing issues.