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HP 11C Scientific Calculator

HP 11C Scientific Calculator

cailculato-hp-11C (5)

The #HP-11C was a mid range scientific programmable calculator. Compared to the previous series it would fall between the HP-33E/C and HP-34C. It also included two new features: a built-in random number generator and a backspace key that allowed numbers to be corrected a digit at a time.

Non-Programmable Features

Compared to the #HP-10C, the HP-11C also included:

  • Hyperbolic and inverse hyperbolic trig functions.
  • Probability (combinations and permutations).
  • Factorial, % change, and absolute value.
  • And, as mentioned above, backspace and a random number generator.


  • Type: Programmable Scientific
  • Manufacturer: Hewlett-Packard
  • Introduced: 1981
  • Discontinued: 1989
  • Cost: USD 135
  • Calculator Entry mode: RPN
  • Display type: LCD seven-segment display
  • Display size: 10 digits
  • CPU Processor: HP Nut core (1LF5 / 1LM2 / 1LQ9)
  • Programming language(s): Keystroke programmable (fully merged)
  • Memory register: 0…20 registers (R0R9,R.0R.9) plus RI, X, Y, Z, T,LAST X
  • Program steps: 63…203 lines
  • Power consumption: 0.25 mW
  • Length: 5.1″
  • Width: 3.1″
  • Height: 0.6″
  • Weight: 4oz


cailculato-hp-11C (1)

WikipediaHP Museum 11CHP11C manual

Hewlett-Packard HP-11C Owner’s Handbook and Problem-Solving Guide (PDF) (G ed.). Corvallis, Oregon, USA: Hewlett-Packard Company, Corvallis Division. November 1985. HP part-number 00011-90001. Archived (PDF) from the original on 2015-10-05.

Markstein, Howard W. (March 1982). “A look inside Hewlett-Packard’s HP-11C”. Electronic Packaging and Production Magazine.

About The Author

Cédric Walter

I worked with various Insurances companies across Switzerland on online applications handling billion premium volumes. I love to continuously spark my creativity in many different and challenging open-source projects fueled by my great passion for innovation and blockchain technology.In my technical role as a senior software engineer and Blockchain consultant, I help to define and implement innovative solutions in the scope of both blockchain and traditional products, solutions, and services. I can support the full spectrum of software development activities, starting from analyzing ideas and business cases and up to the production deployment of the solutions.I'm the Founder and CEO of Disruptr GmbH.