Kids' Size Conversion Chart — Children's Shoes (C/Y) and Clothing (Height) with Approximate Ages

Shoe sizes for children's foot lengths of 100–225 mm (KR, JP, EU, UK, US C/Y) and clothing sizes for heights of 80–164 cm (KR, JP, EU, UK, US), with approximate ages.

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Kids' sizes use different systems from adults'

Children's shoes in the UK and US use a different numbering scale from adults. In the UK, kids' 0–13.5 is followed by adult 1; in the US, children's (C, Child) 13.5 is followed by youth (Y, Youth) 1. So the number ‘US 1’ alone does not tell you whether it is a baby shoe or a shoe for a primary-school child. Always check the C or Y.

For children's clothing, most countries use height as the basis. Korea and Japan use height directly as the size (110 = height of about 110 cm), and Europe uses heights in 6 cm steps (104, 110, 116 …). The UK uses age ranges such as ‘4–5 years’, and the US uses 2T, 3T, 4T (Toddler) followed by numbers such as 5, 6, 7 ….

The kids' shoe chart is based on the common pattern in major sportswear brands' children's size charts (10 mm of foot length = one US size; 160 mm = US 10C), and European sizes are calculated using the Paris point step.

Kids' shoe size conversion chart

Foot length	KR (mm)	Mondopoint	JP (cm)	EU	UK	US (C·Y)	Age (approx.)
100 mm	100	100	10	19.5	3.5	4C	6–12 months
105 mm	105	105	10.5	20	4	4.5C	6–12 months
110 mm	110	110	11	20.5	4.5	5C	6–12 months
115 mm	115	115	11.5	21.5	5	5.5C	12–18 months
120 mm	120	120	12	22	5.5	6C	12–18 months
125 mm	125	125	12.5	22.5	6	6.5C	18–24 months
130 mm	130	130	13	23	6.5	7C	18–24 months
135 mm	135	135	13.5	24	7	7.5C	2–3 years
140 mm	140	140	14	24.5	7.5	8C	2–3 years
145 mm	145	145	14.5	25	8	8.5C	3–4 years
150 mm	150	150	15	25.5	8.5	9C	3–4 years
155 mm	155	155	15.5	26.5	9	9.5C	3–4 years
160 mm	160	160	16	27	9.5	10C	4–5 years
165 mm	165	165	16.5	27.5	10	10.5C	4–5 years
170 mm	170	170	17	28.5	10.5	11C	5–6 years
175 mm	175	175	17.5	29	11	11.5C	5–6 years
180 mm	180	180	18	29.5	11.5	12C	6–7 years
185 mm	185	185	18.5	30	12	12.5C	6–7 years
190 mm	190	190	19	31	12.5	13C	7–8 years
195 mm	195	195	19.5	31.5	13	13.5C	7–8 years
200 mm	200	200	20	32	13.5	1Y	8–9 years
205 mm	205	205	20.5	32.5	1 (adult)	1.5Y	8–9 years
210 mm	210	210	21	33.5	1.5 (adult)	2Y	9–11 years
215 mm	215	215	21.5	34	2 (adult)	2.5Y	9–11 years
220 mm	220	220	22	34.5	2.5 (adult)	3Y	11–13 years
225 mm	225	225	22.5	35.5	3 (adult)	3.5Y	11–13 years

Kids' clothing size chart (by height)

Height	KR (height cm)	JP (cm)	EU (height cm)	UK (age)	US	Age (approx.)
80 cm	80	80	80	1–1½	18M	12–18 months
86 cm	90	90	86	1½–2	2T	18–24 months
92 cm	90	90	92	2–3	3T	2–3 years
98 cm	100	100	98	3–4	4T	3–4 years
104 cm	100	100	104	4–5	4T	4–5 years
110 cm	110	110	110	5–6	5	5–6 years
116 cm	120	120	116	6–7	6	6–7 years
122 cm	120	120	122	7–8	7	7–8 years
128 cm	130	130	128	8–9	8	8–9 years
134 cm	130	130	134	9–10	10	9–10 years
140 cm	140	140	140	10–11	10	10–11 years
146 cm	150	150	146	11–12	12	11–12 years
152 cm	150	150	152	12–13	14	12–13 years
158 cm	160	160	158	13–14	16	13–15 years
164 cm	160	160	164	13–14	16	13–15 years

Treat the age column as a reference only

The age column is an approximation based on the middle of growth records (around the median). Height and foot length vary greatly between children of the same age, so always choose sizes from measurements you take yourself. This chart is not a tool for assessing growth or development and does not replace a diagnosis.

Choosing children's shoes

It is common to allow about 1 cm of room beyond the foot length. Shoes that are too big let the foot slide back and forth and make walking unsteady.
Young children's feet grow fast, so measure again every two to three months.
Children often cannot say when something is uncomfortable. After putting the shoes on, check that about one finger fits behind the heel and that the top of the foot is not pressed.

Details are in Choosing kids' shoe and clothing sizes.

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