Children Ring Size Chart
Children's fingers grow quickly, so a ring bought today may not fit next year. Use age as a starting point, then measure if you can.
Quick answer
A typical 5–6 year old wears a US 2 (UK E, 13.2 mm) and a typical 12 year old a US 3½ (UK G, 14.4 mm). Always measure if the ring is expensive.
Conversion table
| Age | US size | UK size | Inside diameter |
|---|---|---|---|
| 0–12 months | 0 | A | 11.6 mm |
| 1–2 years | 1 | B½ | 12.4 mm |
| 3–4 years | 1½ | D | 12.8 mm |
| 5–6 years | 2 | E | 13.2 mm |
| 7–8 years | 2½ | E½ | 13.6 mm |
| 9–10 years | 3 | F | 14.0 mm |
| 11–12 years | 3½ | G | 14.4 mm |
| 13–14 years | 4 | H | 14.8 mm |
| 15–16 years | 4½–5 | I–J½ | 15.2–15.6 mm |
How to measure a child's finger
Wrap a strip of paper around the base of the finger while the child's hand is relaxed and warm. Mark the overlap, measure the length in millimetres and divide by 3.14 for the diameter.
Do it twice — children rarely hold still, and one reading is not enough.
Safety notes for children's rings
- Avoid rings for children under three; small rings are a choking hazard.
- Choose smooth, low-profile designs that will not catch on clothing.
- Pick nickel-free metals — sterling silver, surgical steel or gold — to avoid skin reactions.
- Check the fit every few months, as fingers grow fastest between ages 8 and 14.
Buying for a gift
Adjustable or open-shank rings are the safest gift choice because they cover several sizes. If you buy a fixed size, buy slightly large and keep it for the following year rather than risk a ring that will not fit at all.
Frequently asked questions
What ring size is a 10 year old?
Typically a US 3 (UK F), around 14 mm inside diameter, though it varies a lot from child to child.
When do children reach adult ring size?
Most reach their adult size between 16 and 18, although fingers keep changing slightly into the twenties.
Keep reading
For an expensive ring, confirm the size with a jeweller before ordering — see the ring size FAQs for resizing advice.