Kids Foot Growth Predictor.
What size to buy today, for tomorrow.
Kids' feet grow fast. Enter your child's current foot length and we'll estimate how much they'll grow over the months ahead — and what size to buy now so it still fits then. A guide based on published foot growth research, not a guarantee. See the studies
Where these numbers come from
The growth rates behind this estimate are compiled from the studies below. Each one is linked, so you can read what it measured and decide for yourself how much it applies to your child.
- González-Elena et al. (2021). A Cross-Sectional Study of Foot Growth and Its Correlation with Anthropometric Parameters in a Representative Cohort of Schoolchildren from Southern Spain Int J Environ Res Public Health. 1,005 children aged 3 to 12, Spain.
- Bosch K, Gerss J, Rosenbaum D. (2010). Development of healthy children's feet—Nine-year results of a longitudinal investigation of plantar loading patterns Gait & Posture. 36 children followed from 14 months to 10 years, Germany.
- Waseda A, Suda Y, Inokuchi S, et al. (2014). Standard growth of the foot arch in childhood and adolescence Foot and Ankle Surgery. 10,155 children aged 6 to 18, Japan.
- Mitra S, et al. (2011). Foot length as a marker of pubertal onset Indian Pediatrics. Annual growth rates by age.
- Stavlas P, et al. (2005). The evolution of foot morphology in children between 6 and 17 years of age J Foot Ankle Surg. Growth of 4.3% a year for boys and 3.9% for girls.
- Gould N et al. (1990). Foot growth in children age one to five years Foot & Ankle. 107 children followed from age 1 to 5.
- Wenger DR et al. (1983). Foot growth rate in children age one to six years Foot & Ankle. Growth rates for ages 1 to 6.
We add 12 mm of growing room to the estimated length before suggesting a size. Paediatric podiatry consensus puts the right allowance between 12 and 17 mm, and we use the low end, so the shoe is less likely to be too big to walk in today.
Growth model data last reviewed 24 January 2025.