Kids Shoe Size Calculator
Calculate children shoe sizes from foot length in US, UK, and EU systems. Enter values for instant results with step-by-step formulas.
Formula
US Size = (foot length cm - 9.1) / 0.847 | EU Size = foot length cm x 1.5 + 2 | UK Size = US Size - 1
US children shoe sizes are derived from foot length in centimeters using the Brannock scale formula. EU sizes use the Paris Point system where each size equals two-thirds of a centimeter. UK sizes typically run one size below US sizes for children.
Worked Examples
Example 1: Toddler First Walking Shoes
Problem: A 2-year-old child has a foot length of 14 cm. What shoe size should the parents buy in US, UK, and EU?
Solution: Foot length = 14 cm\nUS Size = (14 - 9.1) / 0.847 = 5.8, rounded to 6.0\nUK Size = 6.0 - 1 = 5.0\nEU Size = 14 x 1.5 + 2 = 23\nWith 1 cm growth room (15 cm): US 7.0, UK 6.0, EU 24.5
Result: Recommended Purchase: US 7 / UK 6 / EU 24-25 (with growth room)
Example 2: School-Age Child Back-to-School Shoes
Problem: An 8-year-old child has a foot measuring 21 cm. Find the correct shoe sizes across all three systems.
Solution: Foot length = 21 cm\nUS Size = (21 - 9.1) / 0.847 = 14.1, this maps to Youth 2.0\nUK Size = 2.0 - 1 = 1.0\nEU Size = 21 x 1.5 + 2 = 33.5, rounded to 34\nWith 1 cm growth room (22 cm): US 2.5, UK 1.5, EU 35
Result: Recommended Purchase: US Youth 2.5 / UK 1.5 / EU 35 (with growth room)
Frequently Asked Questions
What is the difference between US UK and EU shoe sizes for kids?
US, UK, and EU sizing systems use different scales and starting points for measuring children shoes. US sizes are based on the Brannock device standard where size 1 corresponds to roughly 7.6 centimeters for infants. UK sizes run approximately one size smaller than US sizes, so a US 10 is roughly a UK 9 in children shoes. EU sizes use the Paris Point system where each size represents 6.67 millimeters or two-thirds of a centimeter, calculated as foot length in centimeters multiplied by 1.5 plus 2. Because each system rounds differently, always refer to the specific brand size chart for the most accurate conversion between systems.
How often do children feet grow and when should I check shoe size?
Children feet grow at different rates depending on their age and development stage. Toddlers aged one to three typically grow about two full shoe sizes per year, or roughly one size every four to six months. Preschoolers aged three to six grow about one to one and a half sizes per year. School-age children from six to twelve grow approximately one size per year. Pediatric podiatrists recommend checking shoe fit every six to eight weeks for toddlers and every three to four months for older children. Growth spurts can happen suddenly, so watch for signs of tight shoes such as redness on toes, reluctance to wear shoes, or visible toe impressions at the front of the shoe.
Are shoe sizes the same across all brands for children?
No, shoe sizes are not standardized across brands, and significant variations exist between manufacturers. A size 10 in Nike may fit differently than a size 10 in Adidas or Stride Rite because each brand uses slightly different lasts, shapes, and internal measurements. Some brands run narrow while others are wider, and the toe box shape varies considerably. European brands tend to run slightly larger than American brands in equivalent sizes. Always check the specific brand size chart and compare the insole measurement in centimeters rather than relying solely on the printed size number. When buying online, look for the brand internal length measurement to get the most accurate fit.
What is the Paris Point system used in European shoe sizing?
The Paris Point system is the foundation of European shoe sizing and was developed in France in the nineteenth century. One Paris Point equals exactly two-thirds of a centimeter or approximately 6.67 millimeters. To calculate the EU shoe size, you multiply the foot length in centimeters by 1.5 and then add 2 to account for the shoe construction space beyond the foot. For example, a foot measuring 18 centimeters would calculate as 18 times 1.5 plus 2, equaling EU size 29. The system is linear and consistent, making it arguably the most logical sizing system in use today. However, manufacturers still vary in how they apply the system, so checking actual insole measurements remains important.
Do wide or narrow feet affect which shoe size to choose?
Foot width significantly impacts shoe fit and may require adjustments beyond simply changing the length size. Children with wide feet often need shoes that are a half size larger to accommodate the width, even if the length measurement suggests a smaller size. Many brands offer width options designated as W for wide, M for medium, and N for narrow. If your child has particularly wide feet, look for brands known for generous toe boxes such as New Balance, Keen, or Tsukihoshi. Narrow-footed children may need to size down a half size or choose brands with slimmer profiles. Getting both length and width measured ensures the best fit and prevents issues like bunions or hammertoes that can develop from improper width accommodation.
What formula does Kids Shoe Size Calculator use?
The formula used is described in the Formula section on this page. It is based on widely accepted standards in the relevant field. If you need a specific reference or citation, the References section provides links to authoritative sources.