Head Sizes for Crochet & Knit Hats

Crocheted &/or knitted hats should be made about 1 - 1.5” less than the head circumference. Acrylic hats stretch and sizes vary!
If you make a hat, someone will fit into it!

Hat height is measured BEFORE the brim is added - from the bottom edge of the hat to the center top. If you want a brim, on newborn hats, plan to fold up about 1" for a brim; on adult hats figure 2" or so for a brim. Use your own discretion.


Preemies: 1 – 2 lbs
Head Circumference: 9" – 10" hat circ = 7.5" – 9" Hat height = 3.5 – 4"

Preemies: 2 – 3 lbs
Head Circumference: 10" – 11.25" hat circ = 8.5" –10.25" Hat height = 4"

Preemies: 4 – 5 lbs
Head Circumference: 11.25" –12.25" hat circ = 9" –11.5" Hat height = 4–4.5"

Newborn: 5.5 – 6 lbs
Head Circumference: 12.5" – 13" hat circ = 11" – 12" Hat height = 5 – 5.5"

Newborn: 6 – 10 lbs.
Head Circumference: 13" – 14 " hat circ = 11.5" – 13" Hat height = 5.5 – 6"

Baby 3 – 6 months
Head Circumference: 14" – 17 " hat circ = 12.5" – 16" Hat height = 6.5 – 7"

Baby 6 – 12 months
Head Circumference: 16" – 19 " hat circ = 14.5" – 18" Hat height = 7.5"

Toddler – preschooler (12 months – 3 years)
Head Circumference: 18" – 20 " hat circ = 16.5" – 19" Hat height = 8"

Child (3 – 10 years)
Head Circumference: 19" – 20.5" hat circ = 17.5" –19.5" Hat height = 8.5"

Pre-teens & Teens
Head Circumference: 20.5" – 22" hat circ = 19" – 21" Hat height = 9 – 10"

Adult Woman
Head Circumference: 21.5" –22.5" hat circ = 20" –21.5" Hat height = 11"

Adult Man
Head Circumference: 23" –24" hat circ = 21.5" –23" Hat height = 11"–11.5"