This free online Interest Calculator is so easy that almost anyone can use it – and it's fast to boot! All you have to do to learn how to do interest calculations in a flash is just enter in the loan amount, interest rate, and the number of years the loan lasts. That's it! Who knew that using an Interest Calculator could be so easy and… dare we say … fun? Come on, nobody wants to do loan interest calculations longhand with a pencil and while using Microsoft Excel's formulas is a great deal easier than using a pencil and paper even that is a slow and antiquated interest calculation method compared to our free Interest Calculator online! Try it out now!