Powerful Calculator for Finance, Science, Math, Stats, Unit Conversions, Date and Time Calculations, Numeric Bases, Bit-Level Operations, Complex Numbers, Random Numbers, Prime Numbers, Fractions, Trigonometry, NIST Scientific Constants. Quick Popup Access. Selectable Keypads, Button Size, Font, Display Format. Editable Work Area: Calculate, Annotate Your Work, Change and Repeat Your Calculations, Save to File and Restore. Detailed Help File.