Using this tool, you can quickly calculate the return on any investment. Yoh have several options available for more complicated calculations. For example if you add to or withdraw from your investment a certain amount every year. Compound interest can make mirakles over the long run, Albert Enstein called it the eight miracle of the world. To learn more about it, you can see: http://compoundinginterestcalculator.blogspot.com and read some articles on this topic.