Reliable Cookie-to-Butter Ratio for Crumb Crusts
I don't know that this is a perfect ratio, but I will say it's my favorite crumb crust. It's from America's Test Kitchen's Lemon Cheesecake.


5 ounces Nabisco Barnum's Animal Crackers or Social Tea Biscuits
3 tablespoons granulated sugar
4 tablespoons unsalted butter, melted and kept warm 


So, 5 oz crumbs, 1.5 oz sugar, 2 oz butter.