Size breakdown
7 1/8 hat size in cm and inches
A US 7 1/8 fitted hat is cut for a head that measures 22 3/8 inches around — 56.8 cm.
US fitted
7 1/8
circumference 22 3/8 in ÷ π
Head circumference
56.8 cm
= 22 3/8
UK size
7
= US minus 1/8
EU size
57
= cm rounded
Letter size: about M. M.A head measured up to 0.3 cm from 56.8 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 1/8 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 |
|---|---|---|---|---|---|
| 7 hat size | 6 7/8 | 55.8 | 22 | 56 | M |
| 7 1/8 hat size | 7 | 56.8 | 22 3/8 | 57 | M |
| 7 1/4 hat size | 7 1/8 | 57.7 | 22 3/4 | 58 | L |
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