Measure the head circumference always before buying a new hat! Read about how to measure the circumference after this chart.

Head circumference ~ age Hat size
35-37 cm 13.8-14.6 in 0-1 m 35/37
38-40 cm 15-15.7 in 1-3 m 38/40
41-43 cm 16.1-16.9 in 3-5 m 41/43
44-46 cm 17.3-18.1 in 5-9 m 44/46
47-49 cm 18.5-19.3 in 9 m - 1.5 y 47/49
50-52 cm 19.7-20.5 in 1.5-5 y 50/52
53-55 cm 20.9-21.7 in 5-9 y 53/55
56-58 cm 22-22.8 in 9+ y 56/58
59-61 cm 23.2-24 in 9+ y 59/61
How to measure head circumference
  1. Measure straight around the head from its widest angle. If hair is thick or braided, take that into account.
  2. Use a flexible measuring tape, keeping it as tight as possible while not squeezing the head.
  3. Pick a hat according to these results not by the size of your previous hats.