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Size Chart

How To Determine Your Big Hat Size

2X 2X-3X 3X 3X-4X 4X

Fits Hat Sizes

7 1/4-7 1/2

Fits Hat Sizes

7 1/2-7 3/4

Fits Hat Sizes

7 1/2-8 1/2

Fits Hat Sizes

7 3/4-8 3/4

Fits Hat Sizes

8 1/4-9 1/4

Head Circumference

23" - 24"
58cm - 61cm

Head Circumference

23 1/2" - 24 1/2"
60cm - 63cm

Head Circumference

24" - 26 1/2"
61cm - 67cm

Head Circumference

24 1/2" - 27 1/2"
62cm - 70cm

Head Circumference

26" - 29"
66cm - 74cm


  1. Measure the circumference of your head in inches or centimeters using a tape measure (or string). That is, measure the distance around your head where the brim of the hat (ie: the bottom of the hat) will touch your head.
  2. Compare that number to the "Head Circumference" ranges above to find the range you fall within, then look above for your size. If you fall within two hat size ranges (e.g. 3X and 3X-4X) then hats in both sizes will fit you.
Note: While all Big Hat Store hats are designed to have substantially more depth than "regular sized" mass marketed hats, the larger the hat size the more depth our hats will have.


  1. Your head measures 25 inches (63.5cm) around
  2. Looking up at chart, this size fits under both 3X and 3X-4X sizes (so both sizes would fit).

Actual mathematical method to calculate hat size

If you’re the mathematician type who would like to understand how hat sizes are actually calculated and whether our BIG HATS will fit you, please review the following instructions:

  1. Measure the circumference of your head in inches (The distance around your head where the brim of the hat will touch your head).
  2. Divide the circumference by 3.14, the result is your hat size. Convert the decimal to a fraction. Round the fraction to the nearest 1/8th.
  3. If your hat size falls on or between 7 1/2 to 9 1/4, you will find a hat at our store that will comfortably fit you.


  1. Your head measures 26 inches around
  2. 26 divided by 3.14 equals 8.3. Your hat size is rounded to the nearest 1/8th, so your hat size would be 8 1/4.
  3. Your head is the right size for our regular big hats