Standard Hat Sizing Chart

Hat Sizing Chart
Babies Inches Centimeters Inches Centimeters Inches Centimeters Inches Centimeters Knit Crochet
Preemie (1-2lbs) 9-10 22.9-25.4 8-9 20.3-22.9 2-2¼ 5.1-5.7 3½-4 8.9-10.2 50-110yds 65-150yds
Preemie (2-3 lbs) 10-11 25.4-27.9 9-10 22.9-25.4 2¼-2¾ 5.7-7 4-4½ 10.2-11.4 50-110yds 65-150yds
Preemie (3-4lbs) 11-11½ 27.9-29.2 10-10½ 25.4-26.7 7.0 11.4 50-110yds 65-150yds
Preemie (4-5 lbs) 11½-12 29.2-30.5 10½-11 26.7-27.9 2¾-3 7-7.6 4½-4¾ 11.4-12.1 50-110yds 65-150yds
Preemie (5-6 lbs) 12-13 30.5-33 11-12 27.9-30.5 3-3¼ 7.6-8.3 4¾-5¼ 12.1-13.3 50-110yds 65-150yds
Newborn 13-13½ 33-34.3 12-1 30.5-31.8 3¼-3½ 8.3-8.9 5¼-5½ 13.3-14 100-150yds 130-200yds
0-3 Months 13½-14 34.3-35.6 12½-13 31.8-33 3½- 8.9-9.5 14.0 100-150yds 130-200yds
3-6 Months 14-17 35.6-43.2 13-16 33-40.6 3¾-4¾ 9.5-12.1 5½-5¾ 14-14.6 100-150yds 130-200yds
6-9 Months 17-18 43.2-45.7 16-17 40.6-43.2 4¾-5 12.1-12.7 5¾-7¼ 14.6-18.4 100-150yds 130-200yds
9-12 Months 18-19 45.7-48.3 17-18 43.2-45.7 5-5¼ 12.7-13.3 7¼-7½ 18.4-19.1 100-150yds 130-200yds
Children Inches Centimeters Inches Centimeters Inches Centimeters Inches Centimeters Knit Crochet
1-3 Years (Toddler) 19-19½ 48.3-49.5 18-18½ 45.7-47 5¼- 13.3-14 7½-7¾ 19.1-19.7 100-180yds 130-240yds
3-10 Years (Child) 19½-20 49.5-50.8 18½-19 47-48.3 5½-5¾ 14-14.6 7¾-8 19.7-20.3 100-180yds 130-240yds
10-18 Years (Youth) 20-21½ 50.8-54.6 19-20½ 48.3-52.1 5¾-6¼ 14.6-15.9 8-8½ 20.3-21.6 100-180yds 130-240yds
Adults Inches Centimeters Inches Centimeters Inches Centimeters Inches Centimeters Knit Crochet
Womens Small 21½-22 54.6-55.9 20½-21 52.1-53.3 15.9 8½-8¾ 21.6-22.2 120-200yds 160-270yds
Womens Medium 22-22½ 55.9-57.2 21-21½ 53.3-54.6 -6½ 15.9-16.5 8¾-9 22.2-22.9 120-200yds 160-270yds
Womens Large 22½-23 57.2-58.4 21½-22 54.6-55.9 6½-6¾ 16.5-17.2 9-9¼ 22.9-23.5 120-200yds 160-270yds
Womens Xlarge 23-23½ 58.4-59.7 22-22½ 55.9-57.2 17.2 9¼-9½ 23.5-24.1 120-200yds 160-270yds
Mens Small 22½-23 57.2-58.4 21½-22 54.6-55.9 -6¾ 16.5-17.2 9-9¼ 22.9-23.5 200-255yds 270-340yds
Mens Medium 23-23½ 58.4-59.7 22-22½ 55.9-57.2 17.2 9¼-9½ 23.5-24.1 200-255yds 270-340yds
Mens Large 23½-24 59.7-61 22½-23 57.2-58.4 6¾-7 17.2-17.8 24.1 200-255yds 270-340yds
Mens XL 24-24½ 61-62.2 23-2 58.4-59.7 7-7¼ 17.8-18.4 9½-9¾ 24.1-24.8 225-275yds 300-360yds
Mens XXL 24½-25 62.2-63.5 23½-24 59.7-61 18.4 9¾-10 24.8-25.4 225-275yds 300-360yds
Circumference Formula:
Head Circumference / 3 = ___ - 1" = Crown Circle Diameter
Hat Height Formula:
Head Circumference x 0.4 = Hat Height
Crochet takes approx. 131% more yardage than knitting the same sized item.
Multiply knitting yardage by 1.31 to get the crochet yardage.
Compliments of KnitsyCrochet!
Head Circumference
Hat Circumference
Crown Circle Diameter
Hat Height
Yardage Needed
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Standard Hat Sizing Chart PDF

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