Right now, you can get a free scientific & financial calculator app from Amazon for your Android phone. PG Calculator Free is a powerful scientific and financial calculator that works in Algebraic and RPN (Reverse Polish Notation) modes. You can use common mathematical and physical constants in calculations in both RPN and Algebraic modes. You can also compute with user-defined variables. Convert between binary, octal, hexadecimal, decimal, and scientific (exponential) number formats.
You can also change the look of the calculator by selecting various skins within the application. This version of the application is free. It displays ads but has the same functionality as the PG Calculator (Standard) edition. – Addition, subtraction, multiplication and division – Power and roots – Trigonometric functions: sin, cos, tan, asin, acos, atan – Hyperbolic and factorials functions – Natural and decimal logarithms.
Thanks to Free Things to Do in Seattle for this great freebie.