the scientific calculator for Windows

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What's new?

Supported functions

All functions of the original HP11C (c)Hewlett-Packard, 1981-1989


  • Some functions like the Gamma function are implemented differently from the original HP11C. Their accuracy may vary slightly.
  • There are a few additions to the original calculator. 
  • The STO+Reg function is extended with STO+ ,1 to STO + ,9 as well (also for -,*,/ )
  • The unary operators are also supported on the "I" memory (STO + I )
  • Memory is not converted to program memory after 63 steps.
  • Available program memory = 999 steps.
  • Small differences in operation exist with the SST and BST keys, they are not repetitive.
  • The GTO .nnn combination is not supported, use a click on the program listing in the Program Memory window instead.
  • Keep in mind that programs made with these extensions will not run on your original HP Calculator!


pc key

hp key












. (Decimal separator or RadixMark)




Roll Up / Roll Down stack


Revision history

  • v1.2.7
    Added support for notebook/laptop keyboards
    Changed the support website to this one
    Corrected precision of the f->H.MS and g->H function
  • v1.2.6
    A small bug in the ENG format display has been corrected
    The random seed (STO Ran#) now accepts numbers between 0 and 1
    A problem with the program crashing on f Clear Prgm without program loaded is corrected
    The same problem corrected when clicking on a empty program line without program loaded
  • v1.2.5
    Added Copy to Clipboard function in the menu. Now you can copy the result of the calculation into another program
    Corrected a bug with the ->H and ->H.MS functions 
  • v1.2.4 
    In some occasions, the g% keys dropped the stack instead of keeping it, thus breaking correct calculations of percentages. Fixed.
  • v1.2.3 
    Changed display of program steps to fit the display, changed radixmark, was lost since 1.2.2 :-(.
  • v1.2.2
    Changed sign mode, and cleared a double - sign when typing
  • v1.2.1
    Removed "PRGM" label from the display when not in programming mode.
  • v1.2.0
    Added trial period extension for free registrants. Now you can evaluate the HP11W for 15 extra days.