Boys (Infant → Teen)

Height in cm for EU, age for UK/US — not chest/waist

European kids sizes are the child's height in cm (EU 116 = ~116 cm tall); UK/US sizes are age or Toddler T. Height + weight decide, chest/waist only after age 8.

Finder anchors:height weight chest waist Find my size

Boys' International Conversion (US / UK / EU / AU)US Baby / Newborn — Height + Weight US Boys 2–7 Years (Toddler "T" + Up)US Boys 8–16 Years (with S–XL and Body Measures)Boys' Shoes Fit & Common Mistakes

Boys' International Conversion (US / UK / EU / AU)

Start from the column you already use, read across. EU = height, US = age — a tall child fits the next EU number up.

EU = height, US = age

US 6 ≈ EU 110–116 cm ≈ UK 5–6. The UK/US age numbers are rough — a tall child fits the next EU number up.

Boys' international conversion

US	UK	European (EU)	Australia
12–18 m	12 m	80 cm	—
18–24 m	18 m	80–86 cm	18 m
2T	2–3	92–98 cm	3
4T	3–4	98–104 cm	4
5	4–5	104–110 cm	5
6	5–6	110–116 cm	6
6X–7	6–7	116–122 cm	7
7–8	7–8	122–128 cm	8
9–10	8–9	128–134 cm	9
10	9–10	134–140 cm	10
11	10–11	140–146 cm	11
12	11–12	146–152 cm	12

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US Baby / Newborn — Height + Weight

Infants grow unevenly. If the baby is tall or heavy for their age, size up — the age label is only a starting point.

US baby / newborn sizes

US Size	Weight (lbs)	Height (in)
Newborn	4–8	17–19
3 months	9–11	19–23
6 months	12–15	24–26
9 months	16–18	27–28
12 months	19–20	29–30
18 months	21–23	31–32
24 months	24–28	33–35

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US Boys 2–7 Years (Toddler "T" + Up)

"T" = Toddler (shorter, rounder, bigger head-to-body). A 4T fits differently from a 4 — the T is boxier.

US boys 2–7 years

US Size	Height (in)	Weight (lbs)
2T	33–35	24–28
3T	36–38.5	28.5–32
4T	39–41	33–36
4	42–44	37–41
5	45–47	42–46
6	48–49	47–53
6X–7	50–51	54–58

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US Boys 8–16 Years (with S–XL and Body Measures)

Boys' proportions diverge from girls' after ~size 8 — broader shoulders, longer legs.

Boys go XL later than you'd think

A boy at US 18–20 is already at XL but is still young. Body proportions diverge from girls' after ~size 8.

US boys 8–16 years

US Size	S–XL	Height (in)	Chest (in)	Waist (in)	Hips (in)
8	S	50–53	27	23.5	27.5
10	M	54–57	28.5	25	29.5
12	M	58–60	30	26	31.5
14	L	61–63	32	27	33.5
16	L	64–65	33.5	28	35.5
18	XL	65–66	35	29	37.5
20	XL	67–68	37	30	39.5

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Boys' Shoes

Kids' shoes use a children's UK/US scale that continues into adult at the junior/teen break. Measure foot length in cm — far more reliable than age. See the Shoes page for full tables.

Kids' shoes grow fast

Check foot length every 2–4 months — about 1 EU size change. See How to Measure for how to trace a child's foot.

Boys' shoes — quick guide

UK	EU	US (approx)	Foot length (cm)	Foot (cm)
6	23	6.5	14.5	14.5
7	25	8	15.5	15.5
8	26	9	16.5	16.5
9	27	10	17.5	17.5
10	28	10.5	18.5	18.5
11	29	12	19.5	19.5
12	31	13	20.5	20.5
13	32	1 (junior)	21.5	21.5

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Fit & Common Mistakes

Fit & common mistakes

Never size kids by chest/waist — height (cm) rules for EU, age for UK/US.
"T" is not "T-shirt" — it means Toddler, cut boxier than the same number without T.
Boys vs girls diverge in proportion after ~age 8; don't reuse the other chart.
EU sizes run slimmer/more fitted than US. If the child is on the heavier side, size up.
Check every few months — a Size 6 that fit in spring is tight by autumn.

Need help?

Try our Find my size tool for a personalized recommendation, or visit How to measure to learn how to take accurate measurements.