Figure the fat in foods with this handy fat calculator. "You MUST know what you are eating."
It fits in your pocket or purse! This heavy plastic wheel is 4.5 inches across and comes in its own little vinyl sleeve. The latest copyright date on this is 1990 and now out of date. The nutrition labels already show the percentage of fat calories based on a 2000 calorie diet. Nowadays, your smart phone will have some app that calculates this for you.
So this is NOT the ultimate calculator, but it's more fun to use.