How much nutrients do I need per grow?

Hi im new to growing and was wanting to start soon using advanced nutrients, but I don't know how much of their product I should buy? I am going to use 5 gallon dwc buckets. I just need to gauge how far the size of containers will last given my set up. I want to use connoisseur, sensi-grow, and carboload any advice would be appreciated.​

http://www.advancednutrients.com/hydroponics/calc/
Just set the reservoir size to 5 gal.

It all depends on how many buckets you have and your reservoir size. For instance if you are using a 50 gal resevoir: before buying nutes, go to their site above calculate a feed for 50 gal.

Simple as that.