Shopping in the youth or “big kids'” shoe section often stems from seeking cost savings or unique styles. This practice, however, introduces confusion regarding the numerical conversion between women’s and children’s footwear sizes. Understanding the relationship between these two distinct sizing scales is the first step toward finding a comfortable and well-fitting shoe. The conversion is not a simple one-to-one swap, but relies on a consistent mathematical difference.
The Standard Women’s to Kids’ Size Conversion
The general rule for converting a women’s US shoe size to a youth or big kids’ size is to subtract 1.5 to 2 sizes from the women’s size. This means a Women’s size 6 US most commonly translates to a Youth/Kids’ size 4 or 4.5 US. The 1.5-size difference is often the most reliable starting point for this conversion. For example, a Women’s 8 is a Youth 6.
This numerical difference exists because adult and children’s footwear are built on entirely separate sizing scales, or “lasts,” which are the foot-shaped molds used in shoe manufacturing. Youth sizing typically stops at size 7, at which point it transitions directly into the men’s sizing scale. The women’s scale is offset from the youth and men’s scales, which accounts for the consistent 1.5 to 2 size gap. This conversion is based purely on the internal length of the shoe.
Key Differences in Shoe Fit and Width
While the numerical conversion addresses the length, it does not account for the physical shape of the shoe, which is determined by the last. The last used for youth shoes is shaped differently than the one used for women’s shoes, even if the length is identical. Youth shoes are often designed with a wider toe box relative to the heel, accommodating the typical shape of a developing foot.
Conversely, women’s shoes are generally built on a last that is narrower overall, particularly in the heel and midfoot. This means a youth shoe that is the correct length may feel wider and less secure around the heel for an adult woman. Youth shoes also differ in structural support; they are sometimes designed with a more flexible sole and less structured arch support, as they are intended for a child’s foot that is still developing its arch and gait.
Practical Shopping and Sizing Tips
The lack of universal standardization in the footwear industry means that the 1.5 to 2 size conversion is only a guideline. Sizing can vary significantly between different brands, making it necessary to check brand-specific charts.
The most reliable method for a successful purchase is to measure your foot and consult the specific brand’s size chart, which often includes a centimeter or inch measurement for each size. If shopping online, measuring the length of your foot from heel to longest toe provides the most accurate data point for comparison. When the shoes arrive, it is important to check the retailer’s return policy, as subtle fit differences in width or arch support may not be noticeable until the shoes are worn for a period of time.