From: Karen, a parent

How do you figure out percentage of weight lost?

Hi Karen. Subtract the new weight from the original weight. Then take that value and divide it by the original weight. Then multiply by 100.

For example, if you have a barrel of coffee beans that originally weighed 120 lbs and after now it weighs 90 pounds:

120 - 90 = 30
30 / 120 = 0.25
0.25 * 100 = 25%

Hope this helps!
Stephen La Rocque.