Shoes Size Chart Ages US size EU(RU) size China Size(Marked in the Outsole) FootLength/cm Toddler(1-3 years old) 5.5 21 21/155 12.7 6.5 22 22/160 13.3 7 23 23/165 14 8 24 24/170 14.6 8.5 25 25/175 15.2 9.5 26 26/180 15.9 10 27 27/185 16.5 Kids (3-16 years old) 11 28 28/190 17.1 11.5 29 29/195 17.8 12 30 30/200 18.1 13 31 31/205 19.1 1 32 32/210 19.7 1.5 33 33/215 20.3 2.5 34 34/220 21 3.5 35 35/225 21.9 4 36 36/230 22.2 5 37 37/235 23.2 How to choose the correct shoe size? Two Keys : Foot length & Insole length!!!!! 1. How to get the correct size? Shoe size is based on the insole length. Insole length = Foot length + Free length(0.5~1 cm) Suitable free length: +0.5 cm for Spring/Autumn Shoes; +0.5~1 cm for Summer/Winter Shoes. If your kids feet are fat, or you want totake extra space for growth, you can add 0.5 cm more. 2. How to measure kid"'"s foot length? Please stand agaist the wall,measure thedistance from the wall to kid"'"s front toe. That measured is Foot length. 3. What"'"s theshoe insole length? We measure the shoe insole length by ruler, like the below photo.Then we get the insole length. Please allow the 0.3-0.5 cm error due to manualmeasurement.This below photo is the only method how we measure the insole length, then we write it in oursize chart.