US sizes to letter sizes
Type a value in US to get it in S–XL instantly.
MS–XL
That's 1.02× as large as an average woman’s head, while an average man’s head is 1.02× larger. That fits a head of about 56.85 cm (22.38 inches) around.
What it means
Where does that size sit?
Measure around the head just above the ears and eyebrows. Between sizes, take the larger one; fitted caps run small.
The math
How to convert US to S–XL
US size = head circumference in inches ÷ π; UK = US − ⅛; the EU size is the circumference in centimeters.
Example: 7⅛ US = M S–XL.
Every unit
That hat in every system
Tables
US to S–XL conversion table
| US | S–XL |
|---|---|
| 6⅝ US | XS S–XL |
| 6¾ US | XS S–XL |
| 6⅞ US | S S–XL |
| 7 US | S S–XL |
| 7⅛ US | M S–XL |
| 7¼ US | M S–XL |
| 7⅜ US | L S–XL |
| 7½ US | L S–XL |
| 7⅝ US | XL S–XL |
| 7¾ US | XL S–XL |
| 7⅞ US | XXL S–XL |
| 8 US | XXL S–XL |
S–XL to US conversion table
| S–XL | US |
|---|---|
| XS S–XL | 6¾ US |
| S S–XL | 7 US |
| M S–XL | 7¼ US |
| L S–XL | 7½ US |
| XL S–XL | 7¾ US |
| XXL S–XL | 8 US |
Quick answers
Quick answers
- How many S–XL is 7⅛ US?
- 7⅛ US is M S–XL.
The units
About these units
US sizes (US)
Circumference in inches ÷ π, in eighths.
Letter sizes (S–XL)
XS to XXL, two centimeters apart.
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