Recently over the holidays I ran into a fellow crocheter who had some awesome knowledge to share. I for one LOVE math which is why I think crochet designing is so much fun for me. However I was INTRIGUED when she told me that there is a math formula to figure out hat sizes. Seeing how this is something that I am really interested in and was finding it difficult to determine sizes, I started taking notes.
After I got home I started crunching numbers and comparing the results with other sizing charts and I was floored that the formulas were pretty accurate. I will for sure be keeping this in mind for the rest of my crocheting life. HAHA.
So this is how she broke it down for me.
|
Crochet Circle |
Formulas for finding crochet hat sizes.
Circumference (divided by) 3.14 = Size of Crochet Circle
Circumference (divided by) 10 = ? (multiplied by) 4 = Hat Height
Circumference (divided by) 2 = Hat width
*** These formulas will work with Most hat patterns but not all depending on the pattern type***
For example......
0-3 month old - Circumference = 12 - 14 inches
Circle Size
12 / 3.14 = 3.8 (round nearest whole number or .5)
14/ 3.14 = 4.4 (round nearest whole number or .5)
so your circle size would be 4 inches to 4.5 inches
Hat Height
12 / 10 = 1.2 * 4 = 4.8 (round nearest whole number or .5)
14 / 10 = 1.4 * 4 = 5.6 (round nearest whole number or .5)
So your hat height would be 5 inches to 5.5 inches
Hat Width
12 / 2 = 6
14 / 2 = 7
So your hat width would be 6 inches to 7 inches
Neat huh?!?!?!?!
For those that don't enjoy math like I do I have it all broken down for you below. I hope you enjoy!!!!
Newborn - Circumference = 12 inches
Circle Size
12 / 3.14 = 3.8 (round to the nearest whole number, .75, .50 or .25)
so your circle size would be 4 inches to
Hat Height
12 / 10 = 1.2 * 4 = 4.8 (round nearest whole number, .75, .50 or .25)
So your hat height would be 5 inches
Hat Width
12 / 2 = 6
So your hat width would be 6 inches to
0-3 month old - Circumference = 12 - 14 inches
Circle Size
12 / 3.14 = 3.8 (round nearest whole number, .75, .50 or .25)
14/ 3.14 = 4.4 (round nearest whole number, .75, .50 or .25)
so your circle size would be 4 inches to 4.5 inches
Hat Height
12 / 10 = 1.2 * 4 = 4.8 (round nearest whole number, .75, .50 or .25)
14 / 10 = 1.4 * 4 = 5.6 (round nearest whole number, .75, .50 or .25)
So your hat height would be 5 inches to 5.5 inches
Hat Width
12 / 2 = 6
14 / 2 = 7
So your hat width would be 6 inches to 7 inches
3-6 month old - Circumference = 14 - 16 inches
Circle Size
14/ 3.14 = 4.4 (round nearest whole number, .75, .50 or .25)
16/ 3.14 = 5.0 (round nearest whole number, .75, .50 or .25)
so your circle size would be 4.5 inches to 5 inches
Hat Height
14 / 10 = 1.4 * 4 = 5.6 (round nearest whole number, .75, .50 or .25)
16 / 10 = 1.6 * 4 = 6.4 (round nearest whole number, .75, .50 or .25)
So your hat height would be 5.5 inches to 6.5 inches
Hat Width
14 / 2 = 7
16 / 2 = 8
So your hat width would be 7 inches to 8 inches
6-12 month old - Circumference = 16 - 18 inches
Circle Size
16/ 3.14 = 5.0 (round nearest whole number, .75, .50 or .25)
18/ 3.14 = 5.7 (round nearest whole number, .75, .50 or .25)
so your circle size would be 5 inches to 6 inches
Hat Height
16 / 10 = 1.6 * 4 = 6.4 (round nearest whole number, .75, .50 or .25)
18 / 10 = 1.8 * 4 = 7.2 (round nearest whole number, .75, .50 or .25)
So your hat height would be 6.5 inches to 7.25 inches
Hat Width
16 / 2 = 8
18 / 2 = 9
So your hat width would be 8 inches to 9 inches
1-3 year old - Circumference = 18 - 20 inches
Circle Size
18/ 3.14 = 5.7 (round nearest whole number, .75, .50 or .25)
20/ 3.14 = 6.36 (round nearest whole number, .75, .50 or .25)
so your circle size would be 6 inches to 6.5 inches
Hat Height
18 / 10 = 1.8 * 4 = 7.2 (round nearest whole number, .75, .50 or .25)
20 / 10 = 2.0 * 4 = 8.0 (round nearest whole number, .75, .50 or .25)
So your hat height would be 7.25 inches to 8 inches
Hat Width
18 / 2 = 9
20 / 2 = 10
So your hat width would be 9 inches to 10 inches
3-10 year old - Circumference = 20 - 22 inches
Circle Size
20 / 3.14 = 6.3 (round nearest whole number, .75, .50 or .25)
22 / 3.14 = 7.0 (round nearest whole number, .75, .50 or .25)
so your circle size would be 6.5 inches to 7 inches
Hat Height
20 / 10 = 2.0 * 4 = 8.0 (round nearest whole number, .75, .50 or .25)
22 / 10 = 2.2 * 4 = 8.8 (round nearest whole number, .75, .50 or .25)
So your hat height would be 8 inches to 9 inches
Hat Width
20 / 2 = 10
22 / 2 = 11
So your hat width would be 10 inches to 11 inches
Teen to Adult - Circumference = 22 - 24 inches
Circle Size
22 / 3.14 = 7.0 (round nearest whole number, .75, .50 or .25)
24 / 3.14 = 7.6 (round nearest whole number, .75, .50 or .25)
so your circle size would be 7 inches to 7.75 inches
Hat Height
22 / 10 = 1.8 * 4 = 8.8 (round nearest whole number, .75, .50 or .25)
24 / 10 = 2.4 * 4 = 9.6 (round nearest whole number, .75, .50 or .25)
So your hat height would be 9 inches to 9.5 inches
Hat Width
22 / 2 = 11
24 / 2 = 12
So your hat width would be 11 inches to 12 inches
I hope that all makes sense and I hope this helps with sizing your hats in the future!!!
In the mean time Here is a hat I made for my oldest son recently to match his new winter jacket. The pattern is the
Griffin Hat by
Sincerely Pam
I look forward to finding more tips and tricks to share with you this next year along with a few other fun things. Until then...................
Happy Crafting