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How many belts are in Karate? Well it all depends on the system you take. When I did Brazilian Jiu Jitsu, it was white, blue, purple, brown then black.
Now its actually white, green, blue, purple, brown then black. In American Kenpo, the martial arts I'm based off of, it starts white, yellow, orange, purple, blue, green, 3rd degree brown, 2nd degree brown, 1st degree brown and then 1st degree black for adults and then it goes all the way up to 10th degree black.
For kids it's a little bit different. I don't do the 3 different brown belts because seeing the brown belt for 9 months is redundant. So we have brown belt, red belt, red and black belt, and then they get their junior black belt.
The great thing about having a ranking system is it gives the student a goal to work towards. So basically the more you come to class the faster you can actually rank and get to your next belt. Not saying just because you come to class you're going to get your belt but the more you come to class and learn the material the more you're ready for your next stripe or your next belt.
if you come to class once a week it's going to take you a little bit longer to learn all the material needed for the next belt. If you come two or three times a week you'll be able to move on and progress faster than everybody else.