Interest is the remuneration charged for borrowing money or remuneration paid for using the money.
It can be either the yield on an investment or the interest to be paid on a loan.
Expressed as a percentage, it is called the interest rate and can be calculated as either Compound Interest or Simple Interest.

The Interest Calculator is very useful for you to perform day-to-day calculations

Instructions for using the Interest Calculator
It doesn't require advanced knowledge to use the Calculator, just read the Calculator text, analyze if it's what you need, fill in the fields and click on calculate. There are four calculators with the main interest calculations made on a daily basis.