calculator.org

the calculator home page

Hewlett-Packard HP 55 (Classic MERLIN)

Hewlett-Packard HP 55
Image: Wikimedia CC BY-SA 3.0

The Hewlett-Packard HP 55 is a programmable calculator with 12 digits precision and algebraic logic. It has 75 functions, 35 keys, and an LED (light-emitting diode) display, typical of calculators of this era. The power source is 3xAA.

Facts at a glance:

FeatureValue
TypeProgrammable
Functions75
Keys35
Precision12
LogicAlgebraic
Display typeLED
Length147mm
Width81mm
Thickness33mm
Weight255g
Power Source3xAA
Year introduced1975
Year discontinued1977

Replacements:

If you have a Hewlett-Packard HP 55 that is no longer working, you can first try replacing the 3xAA batteries. If that doesn't solve the problem, then you can consider replacing the calculator with a modern equivalent. We suggest the following current model as a replacement:

See other calculators by Hewlett-Packard