If you're like most people, when you need to do anything beyond basic math, you probably go to your computer and use the calculator built into Windows. A similarly humble version of this calculator exists on your
Windows Mobile phone. It might look a bit different, depending on what kind of phone you have, but the functions are the same. It's not fancy, but it gets the job done. If you're looking to calculate something more specific or more scientific, and you're willing to download software onto your phone, you're in luck. Developers from around the world have created a wide variety of calculation tools, for everything from calories to mortgages.
The best way to find calculator software is to look in the major software directories, including
MobiHand,
Handango,
PocketGear.