There are a number of free calculator programs available for Windows Mobile devices. Handango (handango.com) has a number of freeware calculators for the Pocket PC, including Engineering Calculator, Mortgage Calculator, and Calorie Tracker. Smartphone.Net offers ALL-Calculator LiteM, a basic calculator, and SCalc, a scientific calculator.

PocketPC Freewares (pocketpcfreewares.com) is a great place to find freeware for the Pocket PC. It currently lists over 1,000 freeware titles, including more than 40 free calculators. There isn’t as much freeware available for the Smartphone, but the Smartphone Freeware site (smartphone-freeware.com) lists over 400 titles with 13 calculators.

Math Tablet (statsnow.net) it a programmable scientific graphing calculator for the Pocket PC and Smartphone. It features RPN or algebraic input, matrix and complex number support, hundreds of scientific and statistical functions, a solver for user formulas, and more. It can be purchased from Handango (handango.com).