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Hat and scarf measurement guide

Use this guide to determine standard sizes when designing or crocheting hats, scarves, and cowls. Measurements are approximate and may vary by fit preference or stitch pattern.

SizeHead CircumferenceHat HeightNotes
Preemie9–12 in (23–30 cm)4–4.5 in (10–11.5 cm)For newborns < 5 lbs
Newborn13–14 in (33–36 cm)5 in (13 cm)Snug fit for 0–3 months
Baby15–17 in (38–43 cm)5.5–6 in (14–15 cm)3–12 months
Toddler18–19 in (46–48 cm)6.5 in (16.5 cm)1–3 years
Child19–21 in (48–53 cm)7 in (18 cm)3–10 years
Teen/Small Adult21–22 in (53–56 cm)7.5 in (19 cm)Also fits small adults
Adult (M)22–23 in (56–58 cm)8 in (20 cm)Most common adult size
Adult (L)23–24 in (58–61 cm)8.5 in (21.5 cm)For looser or slouchy fit

Tip: Make hat circumference 1–2 inches (2.5–5 cm) smaller than actual head size for a snug fit if your yarn is stretchy.

TypeWidthLengthNotes
Child Scarf4–5 in (10–13 cm)36–44 in (91–112 cm)Shorter length for ease and safety
Teen/Adult Scarf6–8 in (15–20 cm)60–70 in (152–178 cm)Wraps once or twice comfortably
Extra Long Scarf6–10 in (15–25 cm)70–90 in (178–229 cm)For wrapping multiple times or styling

Tip: Adjust width and length for bulky yarns or specific styling preferences.

StyleCircumferenceHeightNotes
Child Cowl20–22 in (51–56 cm)8–10 in (20–25 cm)Easy to pull over head
Single Loop (Adult)24–28 in (61–71 cm)10–12 in (25–30 cm)Fits over head without buttons
Tall Cowl24–28 in (61–71 cm)14–16 in (35–40 cm)More warmth and drape
Double Loop50–60 in (127–152 cm)10–14 in (25–35 cm)Wraps around neck twice

Tip: Use looser stitches for drapey cowls, tighter stitches for warmth.

  • Gauge matters: Swatch first to ensure correct dimensions.
  • Stitch pattern affects size: Cables, bobbles, or ribbing can shrink width.
  • Yarn choice: Bulkier yarns need fewer rows/inches; finer yarns require more.
  • Add fringe or edging to scarves to increase length.
  • Use elastic stitch patterns (like ribbing) for flexible hat brims.
  • Consider button closures for cowls for easier wear, especially for kids or seniors.