Hat Measurements for Crochet and Knit

Driving yourself crazy trying to crochet the correct size hat? Here is your answer – a complete list of head and hat measurements as you crochet and knit hats so you can get the perfect size.

Head and Hat Measurements for Crochet and Knitting

Basically, you take the head measurement and subtract it by one to one and a half inches to get the measurement for the finished hat, since the hat will stretch. Of course, that really depends on the stretch of your yarn, hook or needle size, and your gauge! I know, sorry it can’t be simpler. For instance, Sugar’n Cream yarn is 100% cotton and has very little stretch, but acrylic yarn (like Lion Brand’s Vanna’s Choice yarn) has a lot of stretch. So, plan accordingly! For me, that means I end up experimenting a lot and unraveling some work. However, I must say that I’ve made many a hat that wasn’t just the right size, most of them a little too big, and, with the exception of preemies and newborns, the hats looked great on each lucky head.

Now, if you have a math brain, Inner Child Crochet says you can take the head measurement, subtract 15%, and then divide by pi (3.14). Bet you thought you’d never have to use that again, did ya? Especially not for crafts! I did test this out on one of my hats – I folded the hat in half and measured the distance across (not perfectly accurate, but close enough for me). The distance is 9 inches, so multiply that by 2 to get the circumference – 18 inches. Take 15% of 18 (or multiply by .85), and you get 15.3, then divide by 3.14 and you get 4.87, which is about the diameter of the crown of my hat!

For the hat circumference, measure from the forehead all the way around. For the hat height, measure from the crown of the head to the base of the ear for winter hats, but for summer hats that have a brim and rest above the ears, only measure to the top of the ear. Take a look at Wooly Wormhead’s pictures for more help.



Head Circumference: 13 to 14 inches (33 to 36 cm)
Hat Circumference: 11.5 to 13 inches (29 to 33 cm)
Hat height (winter hat): 5.5 to 6 inches (13 to 15 cm)


Baby – 3 to 6 months

Head Circumference: 14 to 17 inches (36 to 43 cm)
Hat Circumference: 12.5 to 14 inches (32 to 36 cm)
Hat height (winter hat): 6.5 to 7 inches (15 to 18 cm)


Baby – 6 to 12 months

Head Circumference: 16 to 19 inches (41-48 cm)
Hat Circumference: 14.5 to 16 inches (37 to 41 cm)
Hat height (winter hat): 7.5 to 8 inches (19 to 46 cm)


Toddler – 12 months to 3 years

Head Circumference: 18 to 20 inches (46 to 48 cm)
Hat Circumference: 16.5 to 18 inches (42 to 46 cm)
Hat height (winter hat): 8 inches (20 cm)


Child – 3 to 10 years

Head Circumference: 19 to 20.5 inches (48 to 51 cm)
Hat Circumference: 17.5 to 19 inches (44 to 48 cm)
Hat height (winter hat): 8.5 inches (22 cm)


Pre-Teens and Teens

Head Circumference: 20.5 to 22 inches (53 to 56 cm)
Hat Circumference: 19 to 20.5 inches (48 to 52 cm)
Hat Height (winter hat): 9 to 10 inches (25 cm)


Adult Woman 

Head Circumference: 21.5 to 22.5 inches
Hat Circumference: 20 to 21.5 inches (48 to 57 cm)
Hat height (winter hat): 11 inches (28 cm)


Adult Man 

Head Circumference: 23 to 24 inches (58 to 61 cm)
Hat Circumference: 21.5 to 23 inches (55 to 58 cm)
Hat height (winter hat): 11 to 11.5 inches (28 to 29 cm)

Merry Crocheting!

Print Friendly


  1. Thank you! These measurements are SO helpful. I want my gift to be a surprise to the child and the mother. No asking for measurements.

  2. Thank you soo much! But what I struggle with still is figuring out how many stitches and increases I need in order to obtain the desired width of the beanies. Im still learning and havent got the hang of all this measuring yet! If you know of any web sight that would have something like this it would be greatly appreciated. Thank you :)

  3. i am making baby hats for an orphanage and need to know how to determine what size hook i need for different age groups, i mostly use simply soft, or baby yarn. could you please answer to my email?
    thanks, patricia

    • Hi there Patricia! Well, in general, you would use a smaller hook for smaller heads and larger for larger. So, a G hook would be good for newborns and babies, an H for older babies, an I for toddlers…and so on. Does that help?


  1. [...] one for a toddler (18 months to 3 years) and one for a child (3 to 10 years). See my post on Hat Measurements for Crochet and Knit for a complete list of hat measurements. To make it smaller, just remove an increasing round, and [...]

  2. [...] with a 16 to 18 inch head (it does not fit my baby’s head, and he has an 18 inch head) (see my list of crochet head and hat measurements and how to calculate them). To make the hat larger, add more increasing rounds to the crown. To [...]

  3. [...] use my handy-dandy hat sizing and measurement post when crocheting hats so I can make sure it’s the correct size while I’m in the middle [...]

  4. [...] pattern will fit a toddler with 20 to 21 inch head (see my list of crochet head and hat measurements and how to calculate them). To make the hat larger, add more increasing rounds to the crown. To [...]

  5. [...] girls, too, using different colored yarn. Add more rounds and make it longer for adults by using my hat measurements post. To make a 6 month to 18 month hat, I think it’ll work just fine to just increase the hook [...]

  6. [...] hat measures 5 inches tall, by 7 inches wide. Just like all my hat patterns, I use my handy-dandy hat sizing and measurement post when crocheting hats so I can make sure it’s the correct size while I’m in the middle of [...]

  7. […] or decreasing the amount of increasing rows. If that sounds like total gibberish, check out my Hat Measurements for Crochet and Knitting post that explains it more. In this particular pattern, removing 1 row from the crown will take a […]

  8. […] back for a newborn size. Although, all you have to do is change the width of the crown, using my Hat Measurements for Crochet and Knit post and length of the sides and you can make this hat any size you want! You will need your last […]

  9. […] rows below, or see my pattern for babies here). To make a hat to fit another size, see my post on Crochet and Knit Hat Measurements and how to calculate them. If you’re going to make the hat larger, I suggest adding another […]

  10. […] Welcome, from Tn. I found Hat measurements for crocheting. Here is a link for it Hat Measurements for Crochet and Knit hope this helps out. I even have trouble measuring hats. I am glad I found this for […]

Speak Your Mind


CommentLuv badge