Below are the belt colours and corresponding grades we use in our dojo. Not all karate styles and dojo use all the same colours and some use them in a different order.
Beginner - ungraded
Kyokyu - 9th kyu
Hachikyu - 8th kyu
Nanakyu - 7th kyu
Rokukyu - 6th kyu
Gokyu - 5th kyu
Yonkyu - 4th kyu
Sankyu - 3rd kyu
Nikyu - 2nd kyu
Ikkyu - 1st kyu
Shodan - 1st dan & above
For children there are 'B' grades within the colours. As an example: green belt & a black stripe is 6th kyu 'B'. Grading examinations are held approx. every 3/4 months with continuous training.