Determining Your Size


At Oldhat, Size = Head Circumference in Centimetres. Here's how to determine your size:


If you don't know your size:

1) Take a string or a sewing tape measure.

2) Wrap the tape or string around your head where a hat would sit, mark the spot where the string overlaps by pinching it with your fingers.

3) If you used a string, measure the length. If you used a tape measure read the length. 

4) Your size is the nearest cm to this length. If your measurement is in inches, check the size conversion chart below.


If you already know your size in a different sizing convention, take a look at this chart:

Size Centimetres Inches US Size
XS 54 21 1/4 6 3/4
S 55 21 5/8 6 7/8
56 22 7
M 57 22 1/2 7 1/8
58 22 7/8 7 1/4
L 59 23 1/4 7 3/8
60 23 5/8 7 1/2
XL 61 24 7 5/8
62 24 3/8 7 3/4

Kids' Sizes - Use this table for help with infant and kids' sizing:

Approx. Age Centimetres Inches USA Size
Newborn 34 13 3/8 4 1/4
3M 41 16 1/8 5 1/8
6M 43 16 7/8 5 3/8
1Y 46 18 1/8 5 3/4
2Y - 7Y 48 - 53 18 7/8 - 20 7/8 6 - 6 5/8