einSTein is a 32-bit all-purpose programmable calculator that also accepts expressions and functions. It includes all mathematical, trigonometric, and financial functions, as well as calendar computing. Its RPN function lets you compute the interest rate of any cash transaction. You can calculate the real interest rate of loans, investments, saving accounts, leasing, and more and even convert numbers between hundreds of different measures, grouped in various categories. einSTein also lets you calculate all the values of a triangle (sides, angles, height, area) if you know three of the values, get the solution of equations up to the sixteenth gradient, and do complex and vectorial calculations. With calendar, photo visualizer, game and reminder. Select from an English, Italian, Spanish, or German