Size breakdown
7 hat size in cm and inches
Measuring 22 inches (about 55.8 cm) around the head puts you in US size 7.
US fitted
7
circumference 22 in ÷ π
Head circumference
55.8 cm
= 22
UK size
6 7/8
= US minus 1/8
EU size
56
= cm rounded
Letter size: about M. M.A head measured up to 0.3 cm from 55.8 cm matches this size; between sizes, take the next size up for a non-adjustable hat.Letter sizes vary by brand; check the brand's own chart.
Where 7 sits on the hat sizes chart
This size and its neighbours, so you can compare at a glance:
| US | UK | Head (cm) | Head (inches) | EU | Letter |
|---|---|---|---|---|---|
| 6 7/8 hat size | 6 3/4 | 54.9 | 21 5/8 | 55 | S |
| 7 hat size | 6 7/8 | 55.8 | 22 | 56 | M |
| 7 1/8 hat size | 7 | 56.8 | 22 3/8 | 57 | M |
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