Every day, every hair on your head grows. It grows just a little bit, about ½ inch in a whole month, but that’s more than zero. And remember, you have around 100,000 hairs on your head. So how much hair in total do you grow every day? That’s 50,000 inches a month, or almost 4,200 feet…nearly a mile of hair every month! That’s just your head, too: like all other mammals, you have hair on every part of your body, except for your lips, the flats of your eyelids, the palms of your hands, and the bottoms of your feet. When you figure out all that hair growth for a year, or for your whole life, you see that while you’re eating, sleeping, running, playing soccer, or whatever else you do, you’re also a crazy hair-making machine.
Wee ones: Can you count out 5 hairs on your head with your fingers? (without pulling them out!) What do 5 hairs feel like together?
Little kids: If your hair is 8 inches long right now and you let it grow 2 inches, how long will it be then? Bonus: If your hair is 5 inches long right now and you have 100,000 hairs, how much hair do you have on your head right now?
Big kids: If you’ve been growing 11 miles of hair a year, how much hair have you grown in your life? Bonus: If you grow 42,700 inches of hair each month, how many feet do you grow in a year? See if you can figure out the shortcut!
Wee ones: Count 1, 2, 3, 4, 5.
Little kids: 10 inches. Bonus: 500,000 inches, which happens to be almost 8 miles of hair.
Big kids: Different for everyone…multiply your age in years by 11 (you can also add in 1/2-years, 1/4-years, or months if you like). Bonus: 42,700 feet, because you divide by 12 to get feet, then multiply by 12 for the 12 months!