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HP-45
	HP-45; Advanced Scientific Electronic Pocket Calculator
Type	Scientific
Introduced	1973
Discontinued	1976
Calculator
Entry mode	RPN
Display type	Red LED seven-segment display
Display size	15 digits (decimal point uses one digit), (±10±99)
Programming
Programming language(s)	RPN key stroke
Memory register	Four-register operational stack with nine addressable memory registers + LASTx register
Other
Power supply	Internal rechargeable battery or 115/230 V AC, 5 W
Weight	Calculator: 9 oz (260 g),; recharger: 5 oz (140 g)
Dimensions	Length: 5.8 inches (150 mm),; width: 3.2 inches (81 mm),; height: 0.7–1.3 inches (18–33 mm)

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^[1] with an MSRP of US$395^[2] (equivalent to $2,711 in 2023).^[3] Especially noteworthy was its pioneering addition of a shift key that gave other keys alternate functions.

The calculator was code-named Wizard,^[4] 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.^[5]^[6] 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	log₁₀x, 10^x; log_ex, 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, x², y^x, n!, %, Δ%, $π$ , vector arithmetic, register arithmetic. Statistical accumulation with mean and standard deviation calculations. Fixed point and scientific display modes, 0 – 9 decimal places round-off.

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^[7] and Symbian.^[8]
HP-45 Windows Phone 7 App: 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.