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The HP-45
Type scientific
Introduced 1973
Discontinued 1976
Entry mode RPN
Display type Seven-segment display
Display size 10 + 2
Programming language(s) RPN key stroke

The HP-45 was the second scientific pocket calculator introduced by Hewlett-Packard, adding to the features of the HP-35. It was introduced in 1973[1] with an MSRP of $395[2] (equivalent to $2,178 in 2017).[3] Especially noteworthy was its pioneering addition of a shift key that gave the other keys alternate functions.

The calculator was code-named Wizard,[4] which is the first known use of a code name for a calculator. It also contained an Easter egg that allowed users to access a not-especially accurate stopwatch mode. An accurate version of the stopwatch mode was officially featured in the 1975 successor of the HP-45, the HP-55.


Several individuals and companies make software emulators of the HP 45 series calculators.

Nonpareil, high-fidelity simulator for calculators
Emulates, among other, the HP-45. Licensed under the GNU General Public License (GPL). Available for a large variety of operating systems.
HP-45 Emulator
HP-45 Emulator written in Java. Licensed under the GPL 3. Available for Android [5] and Symbian.[6]
HP-45 Windows Phone 7 App 
An Emulator for Windows Phone 7.
HP-45 Emulator in JavaScript
The HP-45 Program ROM was translated to JavaScript to have an exact simulation of the original calculator for use in web browsers.


  1. ^ "HP Virtual Museum: Hewlett-Packard-45 advanced scientific pocket calculator, 1973". Retrieved 2017-10-15. 
  2. ^ Free, John R. (April 1974). "Those incredible new scientific pocket calculators". Popular Science. p. 124. Retrieved 2017-10-15. 
  3. ^ Federal Reserve Bank of Minneapolis Community Development Project. "Consumer Price Index (estimate) 1800–". Federal Reserve Bank of Minneapolis. Retrieved January 2, 2018. 
  4. ^ HP Calculator History - The HP-45
  5. ^ [1]
  6. ^ [2]

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