Formula for Hats/Beanies Chart

Formula: Subract at least 1” from Circumference and divide by 3.142 (π [Pi]) to get Diameter (Cir./Pi=Dia.)

Measure across the center of the hat round (circle) to get your size in diameter when you are crocheting or knitting.

Note: The chart is an estimate. I rounded up/down to nearest inch.

Age	Head Circumference	Diameter
0 - 3 months	14”	4.25”
3 - 6 months	15”/16”	4.5”/4.75”
6 - 12 months	16”/17”	4.75”/5.0”
12 - 24 months	17”/18”	5.0”/5.5”
2T - 4T	17”/19”	5.5”/5.75”
5T - Preteens	19”/20”	5.75”/6.0”
Teens	20”/21”/22”	6.0”/6.5”/6.75”
Adults	22”/23”/24”	6.75”/7.0”/7.25”

© 2009