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Hat sizes from preemie to adult
| Size | Head (cm) | Head (inches) | Hat around: head less 2.5 cm | Hat height (cm) | Flat crown circle (cm across) |
|---|---|---|---|---|---|
| Preemie | 23–30.5 | 9–12 | 20.5–28 | 8.9–12.7 | 6.5–9 |
| Baby | 35.5–40.5 | 14–16 | 33–38 | 14–16.5 | 10.5–12 |
| Toddler | 40.5–46 | 16–18 | 38–43.5 | 16.5–17.8 | 12–14 |
| Child | 45.5–51 | 18–20 | 43–48.5 | 17.8–19.1 | 13.5–15.5 |
| Tween | 51–56 | 20–22 | 48.5–53.5 | 19.1–20.3 | 15.5–17 |
| Woman | 53–58.5 | 21–23 | 50.5–56 | 20.3–21.6 | 16–18 |
| Man | 56–61 | 22–24 | 53.5–58.5 | 21.6–22.9 | 17–18.5 |
How the numbers are worked out
Head sizes are the Craft Yarn Council head circumference ranges. Each range is about 5 cm wide, so the hat range beside it is the same range less 2.5 cm: a crochet beanie needs a little negative ease to stay on. Pick the hat from the wearer’s own head measurement whenever you can; for a slouchy hat, use the full head measurement. The crown circle is the hat circumference divided by 3.14, the width a top-down hat reaches before you stop increasing.
Hat heights are common brim-to-crown heights for a fitted beanie. Add 3–5 cm for a folded brim, or 5–8 cm for a slouchy hat.
Measure a head
Wrap a tape measure around the head across the forehead and just above the ears, snug but not tight. For a gift you cannot measure, the age range is wide: make the hat for the middle of the range in a stitch that stretches, such as back-loop ribbing.
Try the hat on while you can still change it. Top-down: stop increasing when the crown circle reaches the width in the chart, then try it on after a few even rounds. Bottom-up: try the band on before you start the crown decreases.