Let's say you weighed 180 pounds and lost 30 pounds and wondered what percent of your body weight you lost. Or let's say you saw a great sale for 25% off and want to quickly calculate it, this mini tutorial shows you how. Not only that, learn some quick estimation skills and do the percentage in your head on the fly!

Then again, if you want to take the short cut, here is a percent calculator that eliminates the mental or paper/pencil calculation.