Reference chart
Crochet hat size chart by age
Crochet hat sizes are based on head circumference and hat height. A newborn head measures about 13–15 inches, a toddler 18–20 inches, a child 19–20.5 inches, an adult woman 21.5–22.5 inches and an adult man 22–23.5 inches. Crochet the hat 1–2 inches smaller than the head for a snug fit.
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| Size | Head circumference (in) | Head circumference (cm) | Hat height, brim to crown (in) |
|---|---|---|---|
| Preemie | 12–14 | 30–36 | 4–5 |
| Newborn | 13–15 | 33–38 | 5–6 |
| Baby 3–6 months | 14–17 | 36–43 | 6–6.5 |
| Baby 6–12 months | 16–19 | 41–48 | 6.5–7 |
| Toddler 1–3 years | 18–20 | 46–51 | 7–7.5 |
| Child 3–10 years | 19–20.5 | 48–52 | 7.5–8 |
| Teen / adult small | 20.5–22 | 52–56 | 8–8.5 |
| Adult woman | 21.5–22.5 | 55–57 | 8.5–9 |
| Adult man | 22–23.5 | 56–60 | 9–9.5 |
How do you measure a head for a crochet hat?
Measure a head for a crochet hat by wrapping a flexible tape measure around the widest part of the head, just above the eyebrows and ears.
Keep the tape level and snug but not tight. If you cannot measure the wearer, use the midpoint of the age range in the chart.
How wide should the crown of a crochet hat be?
The flat crown circle of a crochet hat should have a diameter equal to the target hat circumference divided by 3.14.
For a 20 inch hat circumference, stop increasing when the flat circle measures about 6.4 inches (16 cm) across, then work even rounds.
How much negative ease should a crochet hat have?
A fitted crochet hat should have 1–2 inches of negative ease, meaning the hat circumference is 1–2 inches smaller than the head.
Stretchy stitches such as ribbing or front and back post stitches can take more negative ease than solid single crochet.
Source and method: Head circumference ranges follow common Craft Yarn Council-style sizing conventions. Hat heights are typical for a fitted beanie; add 1.5–3 inches for a slouchy hat or a folded brim. Always measure the wearer where possible.
Frequently asked questions
What size is an adult crochet beanie?
An adult crochet beanie is usually 20–21 inches around and 8.5–9 inches from brim to crown for a fitted fit.
How big is a newborn crochet hat?
A newborn crochet hat is usually 13–14 inches around and 5–6 inches tall to fit a newborn head of 13–15 inches.
How do I make a slouchy hat?
Make a slouchy hat by working 1.5–3 extra inches of even rounds beyond the fitted beanie height for the chosen size.