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Hat Sizing Guide

You can measure your head with a tape measure and take measurements in centimetres.

Wrap the tape measure around half a centimetre above the top of your ear, not on your ear. Pull the tape snug but not tight.

If in doubt, always choose a size up where available rather than a size down. For example, for 55.5cm, choose a Medium.

If you own other hats with different hat size labels, the following is a useful conversion table:

Inches
Centimetres
Hat Size Number (UK)
Tom Smarte Size
21-1/4”
54
6-3/4
Small
21-5/8”
55
6-7/8
Small
22”
56
7
Medium
22-3/8”
57
7-1/8
Medium
22-3/4”
58
7-1/4
Large
23-1/8”
59
7-3/8
Large
23-5/8”
60
7-1/2
X-Large
24”
61
7-5/8
X-Large
24-3/8”
62
7-3/4
XX-Large
24-3/4”
63 7-7/8
XX-Large