I was like you at first. I did know about the calculator in Windows but did think much of it. I only used it for basic math till i discovered it had many more advanced tools like calculating a vehicle lease, mortgage, fuel economy, unit conversions, programming mode and few more features. Yes the built-in Windows calculator does do more than your basic math. In order to dig up these option go to your calculator usually hidden in your Accessories folder. Start >Programs > Accessories > Calculator. Now I wont tell you where to find these features just dig under the menu bar because I want it to be a cool surprise. Happy hunting!