I am doing Hershey Kisses for my favour and I wasn't sure how much chocolate I would need to get.. but I found a website that has a calculator with different types of candy (M&Ms, jordan almonds, jelly beans, kisses, champagne candies, melty mints, pillow mints) and how much you will need to fill 2x2 square favor boxes.
I just thought I would share if any of you were also doing/ thinking of doing these favours and were wondering the same thing as me!
http://www.favorideas.com/wedding-blog/the-2-by-2-favor-box/