The most powerful Sci/Eng calculator for Windows. Expression evaluation, 18 digits of precision, variables, >100 functions, unit conversion, polynomial roots, interpolation, polynomial regression, linear algebra, numerical integration and differentiation, systems of linear, non-linear and differential equations, multi-argument functon optimization and fitting, curve, point and histogram graphs, statistical operations, computer math (bin/oct/hex).

A calculator with very small screen footprint but lots of power! Just type in any expression, like "2+3.9/7.1-3 sqr 5", and hit Enter; then modify it and evaluate again at will, without re-entering everything. 18 digits of precision, 30 functions, 12 memories (variables), fractions, unit conversion, adjustable display format and precision, deg/min/sec, save and restore, on-line help; this program is loaded!