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Cap size chart

Different caps are sized in different ways. Enter your head measurement once and see your size for each style.

Hat size calculator

Your hat size
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Your head circumference
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Enter your head measurement to see your size in every system.

Cap sizes by style

  • Fitted caps: exact sizes from 6 ⅞ to 8 (55 to 64 cm).
  • Stretch-fit caps: S/M, M/L and L/XL ranges.
  • Snapbacks and trucker caps: one size, about 55 to 62 cm.
  • Dad caps: one size with a fabric strap that fits most adults.
  • Flat caps: S to XXL, 55 to 64 cm.

Cap size chart

Cap size chart
cmInchesUSUKLetter
46 18 ⅛ 5 ¾ 5 ⅝ –
47 18 ½ 5 ⅞ 5 ¾ –
48 18 ⅞ 6 5 ⅞ –
49 19 ¼ 6 ⅛ 6 –
50 19 ⅝ 6 ¼ 6 ⅛ –
51 20 ⅛ 6 ⅜ 6 ¼ –
52 20 ½ 6 ½ 6 ⅜ XS
53 20 ⅞ 6 ⅝ 6 ½ XS
54 21 ¼ 6 ¾ 6 ⅝ S
55 21 ⅝ 6 ⅞ 6 ¾ S
56 22 7 6 ⅞ M
57 22 ½ 7 ⅛ 7 M
58 22 ⅞ 7 ¼ 7 ⅛ L
59 23 ¼ 7 ⅜ 7 ¼ L
60 23 ⅝ 7 ½ 7 ⅜ XL
61 24 7 ⅝ 7 ½ XL
62 24 ⅜ 7 ¾ 7 ⅝ XXL
63 24 ¾ 7 ⅞ 7 ¾ XXL
64 25 ¼ 8 7 ⅞ 3XL
65 25 ⅝ 8 ⅛ 8 3XL
66 26 8 ¼ 8 ⅛ 3XL

Fit tips

  • Fitted caps are the only caps that need an exact size. For everything else, check the range.
  • If a cap is between sizes, take the larger one and use a sizing strip.

How to measure your head

  1. 1 Use a soft tape measure, or a string and a ruler.
  2. 2 Wrap it around your head where the hat will sit: about 1 cm (⅜ in) above your ears and across the middle of your forehead.
  3. 3 Keep the tape level and snug, not tight. Do not pull it in.
  4. 4 Read the number where the tape overlaps. Measure two or three times and use the largest value.
  5. 5 Type the number into the calculator, or find it in the chart.
How to measure

Frequently asked questions

What size cap should I buy?

Measure your head and use the chart. A 57 to 58 cm head wears a fitted 7 ⅛ to 7 ¼, a stretch-fit S/M or M/L, and fits any one-size snapback.

What does OSFM mean on a cap?

One size fits most. The cap has an adjustable back and fits heads from about 55 to 62 cm.

Is ball cap size the same as hat size?

Yes. Ball caps use the same fitted sizes and letter ranges as other hats.

Related charts

All charts