I am designing my FIRST beer recipe and I don't know how much grain I need for my recipe. I am creating an IPA recipe and I found plenty of information on what grains and what percentages of each grain I should be using, but all the IPA recipes I have looked at have different total amounts when it comes to the amount of grains. How much grain should I use for a 5-gallon batch of beer?
That depends on your mash efficiency. Have you been keeping track? Even when you copy a recipe you will need to adjust for your system. I use an online recipe builder and I'll put in the recipe and go to tools and scale by efficiency and it adjusts then I tweak a bit more. If you're starting from scratch you need to determine the abv you want to get
Lower ABV, less grain. Higher ABV, more grain. It can vary widely. And as Brewcat said, it also depends upon you efficiency.
I got two words for you: BeerSmith.
Or is that just one?