HP-45
The HP-45 is the second scientific pocket calculator introduced by Hewlett-Packard, adding to the features of the HP-35. It was introduced in 1973 with an MSRP of US$395. Especially noteworthy was its pioneering addition of a shift key that gave other keys alternate functions.
HP-45
mdeen · Own work (Own production) · CC BY-SA 3.0
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- HP-45
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- scientific calculator
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wikidata · Q5635557
In this article
Overview
Overview
The calculator was code-named Wizard, 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. The display of the HP-45 hidden timer showing 00 hours 00 minutes 07 seconds and 58/100 second. • HP-45 functions • Arithmetic — +, −, ×, ÷ • Trigonometry — sin, arc sin; cos, arc cos; tan, arc tan (decimal degrees, radians or grads). • Logarithms — log 10 x, 10 x; log e x, e x • Conversions — Decimal degrees, radians or grads ↔ degrees–min.–sec. Rectangular coordinates ↔ polar coordinates. Conversion units: cm/in, kg/lb, ltr/gal • Other — 1/x, √x, x 2, y x, n!, %, Δ%, vector arithmetic, register arithmetic. Statistical accumulation with mean and standard deviation calculations. Fixed point and scientific display modes, 0 – 9 decimal places round-off.
Key facts
Key facts
• Name — HP-45 • Type — Scientific • Entry — RPN • Introduced — 1973 • Discontinued — 1976 • Display Type — Red LED seven-segment display • Display Size — 15 digits (decimal point uses one digit), (±10 ±99) • Prog Lang — RPN key stroke • Memory Data — Four-register operational stack with nine addressable memory registers + LASTx register • Supply — Internal rechargeable battery or 115/230 V AC, 5 W • Weight — Calculator: 9 oz, recharger: 5 oz • Dimensions — Length: 5.8 in, width: 3.2 in, height: 0.7 –
Emulators
Emulators
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 Microsoft Windows. • HP-45 Emulator: HP-45 Emulator written in Java. Licensed under the GPL 3. Available for Android and Symbian. •: 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. • HP-45 Emulator in Python: Simulates the HP-45 and displays and explains its inner workings. For Linux, MacOS, Windows, CP/M, and more, with minimal mode for low-power machines.
Patents
Patents
The complete design of the calculator and its firmware is patented under.
Text attribution
Licensing
Text attribution
Part of the biographical narrative on this page reuses licensed material. Its origin, revision and licence are recorded here.
The biographical narrative on this page is based on the Wikipedia article HP-45, revision 1368806614 (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.
Notes from the source article
Cited by Wikipedia
Notes from the source article
These works are cited by the source article, in its own numbering. They are recorded as its citations, not as sources VALÉORINE has verified.
- 1.HP Virtual Museum: Hewlett-Packard-45 advanced scientific pocket calculator, 1973.
- 2.Free, John R. Those incredible new scientific pocket calculators. Popular Science. 124. April 1974.
- 3.THE HP-45. HP CALCULATOR HISTORY.
- 4.Miller, Paul E. HP-45 Calculator As A Stopwatch. Decode Systems. 2016-08-31.
- 5.HP 45 Scientific Calculator Hidden Timer.
- 6.Krischik, Martin. HP-45 scientific calculator. Apps on Google Play. 2023-09-09.
- 7.HP-45 scientific calculator. smartsam.de. 2009-05-10.
References
Citations
References
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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 14 August 2026.
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