Ok, I have a recipe from a friend and it is for a pineapple carrot cake that I bake in a 11x13 pan. How would I go about doubling or even tripling this recipe? Never had to do this. I need to make enough batter for four 12x18x2 pans. Any ideas? Thanks for your help cc friends. 
I have a carrot cake recipe that I have doubled and tripled many times. I usually use a scale to weigh the ingredients so it is a simple case of just multiplying the ingredient list by 2 (or 3 or 4). My recipe makes a good sized cake and my KA mixer bowl will only hold a double quantity though. You'll need to take this into account when you make yours.
I just follow the instructions on my recipe as if I were making only one batch, but using the doubled up ingredients...if this makes sense to you.
One trick I have learned is to rewrite your ingredient list once you've done the math. Sometimes when you're following a recipe that is written for one cake and you want two, you forget you've got to multiply and just add enough for one so I've learned to rewrite the list and follow that rather than the one in my cookbook.
Good luck.
This website allows you to enter the ingredients in the current amount and will figure increases or decreases for the amount you want.Works great!
http://www.fruitfromwashington.com/Recipes/scale/recipeconversions.php
I thought about using a scale but I don't know how I would weigh oil. I may still get one that way I can figure out how many carrots = 2c.
I love the website link!
Here goes nothing (but money and time LOL) Thank you guys! You all are the greatest not to mention a lifesaver 
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