Hat woes and Hat formulas

I've been having trouble making hats recently. Sometimes, I think the size is not correct, and I end up frogging most of my work. I'd try to make a larger size by modifying the patterns, but they didn't work well.

Gladly, I found this great resource from beginner-crochet-patterns.com. 

If I know the circumference size, I can figure out the approximate length and width it needs to be. If I don't know the circumference, I can guesstimate with these approximate measurements:

Preemie baby: 11" -12" or 28 cm - 30.5 cm
Newborn baby: 13 " or 33 cm
Baby 2 weeks - 3 months: 14 " or 35.5 cm
Baby 3-6 months: 15" or 38 cm
Baby 6-9 months: 16" or 40.5 cm
Baby 9-12 months: 16 1/2 " or 42 cm
Baby 12-18 months: 17 " or 43.5 cm
Baby 18-24 months: 18 " or 46 cm
Toddler 2 years - 5 years: 18" - 19 " or 46 cm - 48.5 cm
Child: 19"- 20" or 48.5cm - 51 cm
Teenager: 20-21" or 51 cm - 53.5 cm
Adult woman: 22" or 56 cm
Adult man: 23" or 59 cm

Use the formula circumference (in) / 3.14 to find the width of the crown.The length of the hat is determined by the formula (circumference/10) x 4. 

Learning this tip has made me feel more confident about my hat making technique. I can also double check the finished size when I am following a pattern. For step-by step directions and 4 extra hat patterns you can make, check out the blog beginner-crochet-patterns.com. 

Thing 1 Thing 2 hats are almost done, and then to redo a cap and football beanie!

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