The Museum of HP Calculators

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The Museum of HP Calculators displays and describes Hewlett-Packard calculators introduced from 1968 to 1986 plus a few interesting later models. There are also sections on calculating machines and slide rules as well as sections for buying and selling HP calculators, an HP timeline, collecting information and a software library.

The Main Exhibit Hall

Before HP Calculators (1614-1968)

The First HP Calculators (1968)

High End Desktop Series (1971)

The Classics (1972)

  • HP-35 The First Slide Rule Pocket Calculator
  • HP-80 The First Business Calculator
  • HP-45 Slide Rule++
  • HP-65 The First Programmable Handheld
  • HP-70 Inexpensive Business Calculator
  • HP-55 Scientific/Programmable with Quartz Timer

Classic Printing Desktop Calculators (1973)

  • HP-46 Printing Version of the HP-45
  • HP-81 Printing Version of the HP-80
  • HP-46, 56, 66 and HP-9805 Design Studies.

Second Generation Handheld Calculators (1975)

  • HP-10 Handheld Printing Adding Machine
  • HP-21 Second Generation HP-35
  • HP-22 Business Calculator
  • HP-25 Scientific Programmable
  • HP-25C HP-25 With Continuous Memory
  • HP-27 "Do Everything" Model (Sci/Stat/Math/Bus)
  • HP-29C & HP-19C High End Programmables

Second Generation Desktop Calculators (1976)

  • HP-91 Printing Scientific Calculator
  • HP-92 Printing Business/Financial Calculator
  • HP-95C Unreleased Printing Programmable Calculator

Second Generation Mag Card Programmables (1976)

In A Class By Itself (1977)

  • HP-01 The Hewlett-Packard Calculator Watch

Third Generation of HP Calculators (1978)

  • HP-31E Basic Scientific Calculator
  • HP-32E Scientific/Statistical
  • HP-33E/C Scientific Programmable Calculator
  • HP-34C Scientific Prog. With Integration & Solve
  • HP-37E Financial Calculator
  • HP-38E/C Programmable Financial

Small Computers and Computer-like Calculators (1979)

The 10C series: Compact yet Sophisticated Calculators (1981)

  • HP-10C Basic Scientific Programmable Calculator
  • HP-11C More Advanced Scientific Programmable
  • HP-12C Top Selling Business Calculator
  • HP-15C Scientific With Matrix & Complex Math
  • HP-16C The Computer Scientist Calculator

Some Interesting Later Models (1986)


Discussion & Guest Areas

Collecting & Using

History & Technology

For Sale and Wanted

Other Resources

The Museum of HP Calculators and the museum curator are not affiliated with the Hewlett-Packard Company.

Text and images are Copyright David G. Hicks, 1995 - 2002. Quotations of HP manuals are Copyright Hewlett Packard Company - various years. Please send feedback to If you have questions, you might try the HP Forum and the FAQ. For questions about me and the origin of the museum, please see my personal page.

The Museum of HP Calculators