Baby Shoe Size Chart: US, UK & EU Sizes by Age (0–24 Mo)

How baby shoe sizes work

For babies the EU size is the steadiest way to shop across brands, because it tracks foot length directly — the EU number climbs steadily with the foot, 16, 17, 18, 19, 20, 21, 22, while US and UK sizes step in whole numbers. A 12–18-month-old wears a US 5, a UK 4 and an EU 20 — a 4.50 in (11.4 cm) foot; a 24-month-old wears a US 7, a UK 6 and an EU 22 — a 5.00 in (12.7 cm) foot.

Five things about the model are worth stating plainly. First, the table is indexed by age in whole months, and the age bands are whole-month ranges — 0–3, 4–6, 7–9, 10–12, 13–18, 19–23, 24. Second, foot length in cm is inches × 2.54, rounded to 1 decimal place — 4.50 × 2.54 = 11.43 → 11.4 cm. Third, a 24-month-old takes the “24 months” row (US 7, EU 22), not the 18–24 row — the bands are whole months. Fourth, the EU size is the steadiest way to shop across brands, because it tracks foot length directly. And fifth, brands vary, so always measure the foot and check the brand’s own chart before ordering; all listed in Accuracy & limitations.

The worked example, line by line

Setup: age 15 months.

Line 1 — the age band. 15 months falls in the 13–18 whole-month range, so the band is 12–18 months.

Line 2 — the US size. The US size for the 12–18 month band is 5.

Line 3 — the UK size. The UK size for the 12–18 month band is 4.

Line 4 — the EU size. The EU size for the 12–18 month band is 20.

Line 5 — the foot length. The foot is 4.50 in, which is 4.50 × 2.54 = 11.43 → 11.4 cm.

Table 1 — Baby shoe sizes by age

The EU size is the steadiest way to shop across brands, because it tracks foot length directly — the EU number climbs steadily with the foot while US and UK sizes step in whole numbers.

Every branch, checked

age 1 month: Age 1 months (0–3 months): US 1, UK 0, EU 16, foot 3.50 in (8.9 cm) — A 1-month-old wears a US 1, a UK 0 and an EU 16 — a 3.50 in (8.9 cm) foot.

age 4 months: Age 4 months (3–6 months): US 2, UK 1, EU 17, foot 3.75 in (9.5 cm) — A 4-month-old wears a US 2, a UK 1 and an EU 17 — a 3.75 in (9.5 cm) foot.

age 7 months: Age 7 months (6–9 months): US 3, UK 2, EU 18, foot 4.00 in (10.2 cm) — A 7-month-old wears a US 3, a UK 2 and an EU 18 — a 4.00 in (10.2 cm) foot.

age 10 months: Age 10 months (9–12 months): US 4, UK 3, EU 19, foot 4.25 in (10.8 cm) — A 10-month-old wears a US 4, a UK 3 and an EU 19 — a 4.25 in (10.8 cm) foot.

age 20 months: Age 20 months (18–24 months): US 6, UK 5, EU 21, foot 4.75 in (12.1 cm) — A 20-month-old wears a US 6, a UK 5 and an EU 21 — a 4.75 in (12.1 cm) foot.

age 24 months: Age 24 months (24 months): US 7, UK 6, EU 22, foot 5.00 in (12.7 cm) — A 24-month-old wears a US 7, a UK 6 and an EU 22 — a 5.00 in (12.7 cm) foot.

age 13 months: Age 13 months (12–18 months): US 5, UK 4, EU 20, foot 4.50 in (11.4 cm) — A 13-month-old wears a US 5, a UK 4 and an EU 20 — a 4.50 in (11.4 cm) foot.

The reverses, worked backwards

EU 16: An EU 16 is the 0–3 month band: US 1, UK 0, foot 3.50 in (8.9 cm) — the smallest row in the table. There is no smaller EU size in the table.

EU 17: An EU 17 is the 3–6 month band: US 2, UK 1, foot 3.75 in (9.5 cm). An EU 16 is the 0–3 month band; an EU 18 is the 6–9 month band.

Foot 4.00 in: A 4.00 in foot is the 6–9 month band: US 3, UK 2, EU 18. A 3.75 in foot is the 3–6 month band; a 4.25 in foot is the 9–12 month band.

EU 22: An EU 22 is the 24 month band: US 7, UK 6, foot 5.00 in (12.7 cm) — the largest row in the table. An EU 21 is the 18–24 month band; there is no larger EU size in the table.

Foot 5.00 in: A 5.00 in foot is the 24 month band: US 7, UK 6, EU 22. A 4.75 in foot is the 18–24 month band; there is no larger foot length in the table.

Smallest age band with EU at least 20: The smallest age band with an EU size of at least 20 is the 12–18 month band (EU 20) — exact STEP. The 9–12 month band is EU 19, under 20; the 18–24 month band is EU 21.

What the defaults assume

The defaults are age 15 months — Age 15 months (12–18 months): US 5, UK 4, EU 20, foot 4.50 in (11.4 cm). With age 1 month, Age 1 months (0–3 months): US 1, UK 0, EU 16, foot 3.50 in (8.9 cm) — A 1-month-old wears a US 1, a UK 0 and an EU 16 — a 3.50 in (8.9 cm) foot. With age 4 months, Age 4 months (3–6 months): US 2, UK 1, EU 17, foot 3.75 in (9.5 cm) — A 4-month-old wears a US 2, a UK 1 and an EU 17 — a 3.75 in (9.5 cm) foot. With age 7 months, Age 7 months (6–9 months): US 3, UK 2, EU 18, foot 4.00 in (10.2 cm) — A 7-month-old wears a US 3, a UK 2 and an EU 18 — a 4.00 in (10.2 cm) foot. With age 10 months, Age 10 months (9–12 months): US 4, UK 3, EU 19, foot 4.25 in (10.8 cm) — A 10-month-old wears a US 4, a UK 3 and an EU 19 — a 4.25 in (10.8 cm) foot. With age 20 months, Age 20 months (18–24 months): US 6, UK 5, EU 21, foot 4.75 in (12.1 cm) — A 20-month-old wears a US 6, a UK 5 and an EU 21 — a 4.75 in (12.1 cm) foot. With age 24 months, Age 24 months (24 months): US 7, UK 6, EU 22, foot 5.00 in (12.7 cm) — A 24-month-old wears a US 7, a UK 6 and an EU 22 — a 5.00 in (12.7 cm) foot. With age 13 months, Age 13 months (12–18 months): US 5, UK 4, EU 20, foot 4.50 in (11.4 cm) — A 13-month-old wears a US 5, a UK 4 and an EU 20 — a 4.50 in (11.4 cm) foot. With EU 16, 0–3 months (exact 16) — at 0–3 months the figures are Age 0 months (0–3 months): US 1, UK 0, EU 16, foot 3.50 in (8.9 cm); at the lower neighbor the figures are not in the baby shoe table — EU sizes run 16–22, foot lengths 3.50–5.00 in With EU 17, 3–6 months (exact 17) — at 3–6 months the figures are Age 4 months (3–6 months): US 2, UK 1, EU 17, foot 3.75 in (9.5 cm); at the lower neighbor the figures are Age 0 months (0–3 months): US 1, UK 0, EU 16, foot 3.50 in (8.9 cm) With foot 4.00 in, 6–9 months (exact 4.00) — at 6–9 months the figures are Age 7 months (6–9 months): US 3, UK 2, EU 18, foot 4.00 in (10.2 cm); at the lower neighbor the figures are Age 4 months (3–6 months): US 2, UK 1, EU 17, foot 3.75 in (9.5 cm) With EU 22, 24 months (exact 22) — at 24 months the figures are Age 24 months (24 months): US 7, UK 6, EU 22, foot 5.00 in (12.7 cm); at the lower neighbor the figures are Age 19 months (18–24 months): US 6, UK 5, EU 21, foot 4.75 in (12.1 cm) With foot 5.00 in, 24 months (exact 5.00) — at 24 months the figures are Age 24 months (24 months): US 7, UK 6, EU 22, foot 5.00 in (12.7 cm); at the lower neighbor the figures are Age 19 months (18–24 months): US 6, UK 5, EU 21, foot 4.75 in (12.1 cm) With smallest age band with EU at least 20, 12–18 months (exact 20) — at 12–18 months the figures are Age 13 months (12–18 months): US 5, UK 4, EU 20, foot 4.50 in (11.4 cm); at the lower neighbor the figures are Age 10 months (9–12 months): US 4, UK 3, EU 19, foot 4.25 in (10.8 cm) With age 0 months, Age 0 months (0–3 months): US 1, UK 0, EU 16, foot 3.50 in (8.9 cm) — A 0-month-old wears a US 1, a UK 0 and an EU 16 — the smallest row. With age 24 months, Age 24 months (24 months): US 7, UK 6, EU 22, foot 5.00 in (12.7 cm) — A 24-month-old wears a US 7, a UK 6 and an EU 22 — the largest row. With EU 19, Age 10 months (9–12 months): US 4, UK 3, EU 19, foot 4.25 in (10.8 cm) — An EU 19 is the 9–12 month band: US 4, UK 3, foot 4.25 in (10.8 cm). With EU 21, Age 19 months (18–24 months): US 6, UK 5, EU 21, foot 4.75 in (12.1 cm) — An EU 21 is the 18–24 month band: US 6, UK 5, foot 4.75 in (12.1 cm). With foot 3.75 in, Age 4 months (3–6 months): US 2, UK 1, EU 17, foot 3.75 in (9.5 cm) — A 3.75 in foot is the 3–6 month band: US 2, UK 1, EU 17. With foot 4.75 in, Age 19 months (18–24 months): US 6, UK 5, EU 21, foot 4.75 in (12.1 cm) — A 4.75 in foot is the 18–24 month band: US 6, UK 5, EU 21. With age 25 months, Age 25 months is outside this chart — ages run 0–24 months. — A 25-month-old is outside this chart — it covers 0–24 months only, so the calculator shows an input error.

Output · formula · meaning

Who uses this

• The parent ordering shoes online: they learn a 15-month-old wears a US 5, a UK 4 and an EU 20 — and they check the age-20 branch to see the next size up.
• The parent whose baby is between sizes: they learn a 4.00 in foot is the 6–9 month band — and they check the foot-5.00 reverse to see the largest row.
• The grandparent buying a gift: they learn an EU 22 is the 24 month band, US 7 — and they check the EU 16 reverse to see the smallest size.
• The shopper reading a European label: they learn the EU size tracks foot length directly — and they check the R6 reverse to see that the 12–18 month band is the smallest with an EU of at least 20.

Accuracy & limitations

The table is the standard published baby shoe size chart: US 1–7, UK 0–6, EU 16–22, foot 3.50–5.00 in; foot length in cm is inches × 2.54, rounded to 1 decimal place. What the calculator cannot do is fit your baby: brands vary, so always measure the foot and check the brand’s own chart before ordering; measure in the evening, when feet are at their largest, with the baby standing if they can; leave about 0.5 in (about 1 cm) of growing room — a thumb’s width at the toe; babies outgrow shoes fast, often every 2–3 months in the first year, so buy the next size up only when the current one is snug; soft-soled shoes are the usual choice before a baby is walking, and a stiff sole is not needed until they are. Use the foot length, not just the age — then check the brand’s chart.

Frequently asked questions