It would be wrong to say that using an interest calculator is a treat. It is, in fact, something that can be a problem for people who do not remember their junior high school math. The Interest = Principle X Rate X Time problems may have been forgotten by many people long ago. Even if the formula was not forgotten, many people prefer to avoid excessive math. When someone buys a new home or takes out a loan he may wonder how much interest he will pay. When he wonders how much interest he will pay, he needs to use this piece of software.
All the user has to do is put the numbers into the calculator in the right order. The software does the rest as soon as he hits the calculate button. If someone does not want to do it on a website, there are plenty of apps for Android, iPhone and Blackberry phones that serve the same purpose. These apps can be downloaded from the various market places for free.