How much grey primer and black spray paint do I need to paint my bike black?

I am going to use grey prime and black spray paint on my bike with decals and clear lacquer. However, how much of grey primer, black spray paint and clear lacquer will I need. I will appreciate any good suggestions.|||1 can of primer, 3 cans of paint and lacquer. I say 3 cuz you should do 2 coats of each. And you will have some left over for touch ups.|||If you're talking about a bicycle you should be fine with 1 can of each if you're careful. Maybe 2 for the clear if the decals are on the thick side.