HP-18C
Illustration — An HP-18C in the state used for operating it. When not in use or for transport, it can be folded together due to its clamshell design, so that its width becomes half of what it is in the image. The HP-18C is a Hewlett-Packard business calculator which was quickly followed by the very similar but greatly improved HP-19B. The HP-18C is HP's first RPL-based calculator internally, even though this was not visible on user-level in this non user-programmable model.
HP-18C
HP 18C Calculator.jpg: Flickr user "Joe Haupt" derivative work: Pittigrilli · CC BY-SA 2.0
- Field
- financial calculator
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wikidata · Q5635544 · wikipedia · HP-18C
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Overview
The user has a solver (another HP first) available, but only had about 1.5 KB of continuous memory available to store equations. The calculator has many functions buried in a menu structure. The clamshell design is fairly robust, but the battery door is the shortcoming of this whole line; 18C, 19B, and 28C/S models. The HP-18C was introduced in June 1986.
HP-18C is a financial calculator or calculator.
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The biographical narrative on this page is based on the Wikipedia article HP-18C, revision 1353088337 (EN edition), by its contributors. VALÉORINE has edited that text and built its own documentary record around it. The reused material is available under CC BY-SA 4.0, and this page's reuse of it is offered under the same licence. Everything else on this page — the chronology, the holdings, the evidence, the plates and the connections — is VALÉORINE's own record. Sources and licences.
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The Encyclopedia exists whether or not anything is for sale. Corrections are recorded rather than overwritten, and every version of this record is kept. Published 16 August 2026.
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