Why Is Everyone Talking About Compound Interest Calculator?

Compound Interest: 

Compound interest is the concept of adding accumulated interest back to the principal sum, so that the  interest is earned on the top of interest from that moment on. 

The act of declaring interest as principal is called composition.Financial institutions vary in terms of their composition rates  daily, monthly, annual, etc. http://www.thebankinfo.com/blog/post/why-is-everyone-talking-about-compound-interest-calculator%3F