How much paint?

[nsb29]

I ask this question in the paint and body section sometime back everybody wanted to tell me how to paint my truck but never got an answer on the amount after painting the top white I realize the gallon of paint I bought for the rest of the truck will not be enough I am using concept by PPG Single stageI am giving the truck for coats inside and outside of the fleet side bed the rest of the cab doors fenders wheel tubs tailgate hood etc. looking for someone who has done the same and how much material they used thanks Doug