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Kids hat size chart

Children’s heads grow fast until about age eight. Choose an age or measure your child to get a size that fits today.

Hat size calculator

Your hat size
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Your head circumference
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Enter your head measurement to see your size in every system.

Kids hat sizes by age

Use this as a starting point. Children of the same age can differ by 3 to 4 cm, so a quick measurement beats guessing.

Kids hat sizes by age
AgecmInchesUS
Toddler (1 to 2 years) 45 – 49 17.7 – 19.3 –
2 to 4 years 47.5 – 51 18.7 – 20.1 –
5 to 8 years 50.5 – 53 19.9 – 20.9 6 ⅜ – 6 ⅝
9 to 12 years 52 – 55.5 20.5 – 21.9 6 ½ – 7
Teen 54 – 58 21.3 – 22.8 6 ¾ – 7 ¼

Kids vs adult hat sizes

Most children reach 52 to 55 cm (20 ½ to 21 ⅝ in) by age 10, which overlaps the smallest adult sizes. A child who measures 55 cm or more can wear an adult Small or a fitted 6 ⅞, which gives more style choice than kids ranges.

How to measure a child for a hat

  • Have your child sit still and look straight ahead.
  • Measure around the widest part of the head, just above the ears and eyebrows.
  • Measure over the hair they usually wear.
  • Take two readings and use the larger one.

How to measure your head

  1. 1 Use a soft tape measure, or a string and a ruler.
  2. 2 Wrap it around your head where the hat will sit: about 1 cm (⅜ in) above your ears and across the middle of your forehead.
  3. 3 Keep the tape level and snug, not tight. Do not pull it in.
  4. 4 Read the number where the tape overlaps. Measure two or three times and use the largest value.
  5. 5 Type the number into the calculator, or find it in the chart.
How to measure

Frequently asked questions

What size hat does a 5 year old wear?

Most 5 year olds measure 51 to 53 cm (20 to 20 ⅞ in), a youth 6 ⅜ to 6 ⅝ or a kids adjustable cap.

What size hat does an 8 year old wear?

About 52.5 cm on average, usually 51 to 54 cm (20 to 21 ¼ in): a youth 6 ⅜ to 6 ¾ or a one-size kids cap.

At what age can a child wear an adult hat?

Usually between 10 and 13, once the head measures 55 cm (21 ⅝ in) or more.

Related charts

All charts