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RPN-45 Calc

RPN-45 Calc



RPN-45 HD is a complete simulation of the scientific hand-held calculator HP-45 from 1973. Processing times and behavior have been carefully modelled after the original. Switch to the "Super-45" mode and watch the HP-45 do things never seen before.


• Photo-realistic look based on an existing device

• Animated keys with adjustable click sound and visual feedback

• All functions and operations of the HP-45 fully implemented

• Supports "secret" timer. Use it as 12/100-hours timer or even as a chess clock.

• Optional hyperbolic functions

• Simulation of the HP-45's computation times (optional)

• Correct wrong number entries by swiping left across the display

• Cut/copy/paste display value

• "Live" display of stack and all memory registers (in landscape mode)

• Built-in manual

• 30 selectable background images, even add your own

• HP-91-like paper tape printer:

- Supports MAN, ALL, and NORM modes

- Quickly insert arbitrary text

- Delete any line

- Send tape via E-Mail or to any AirPrint-capable printer

- Ribbon color black or blue

- Optionally print negative results in red

- Print stack and registers

Turn on "Super-45" and enjoy a super-charged HP-45:

• Complex numbers: available for almost all operations and functions

• More memory: twice the number of memory registers.

• "Continuous" stack and memory registers

• Improved functions:

- Raise any number to any power

- Faculty of any number

- Logarithm and square root of negative numbers

- Preset timer with the iPad's real time

- Chess clock mode

• New functions:

- Solve linear equations in two or three unknowns

- Find the roots of quadratic and cubic equations

- Statistics: normal distribution and correlation coefficient of paired variables

- Linear regression, combinations, permutations

- Integer and fractional parts

- Display rounding

- Random numbers in a given range

- Day of the week for any date between Jan 1, 0001 and Dec 31, 9999

- Easter date for any year between 1583 and 4099

- Support for Julian dates

- Number of days between any two dates

- Last Stack

- Convert display value to hexadecimal

- Percentage of sum

- Register arithmetic includes sum registers and LAST x

• Enhanced user interface:

- Visual indicators for prefix keys and angular modes

- Small values switch to scientific notation if required

- Localized decimal point

- Thousand's separator

For more information and sample calculations visit cuveesoft.ch/rpn45/en


"A great simulation of the HP-45. Beautifully made, with a lot of attention to small details."

"This is by far the best RPN calculator available for the iPad!"

"This is one of the most accurate but also nicest looking emulators I have come across for the HP-45, or any vintage HP calculator for that matter."

"This is exactly what I've been searching. My HP 45 packed up some time ago. Thank you so much!"

What's New in Version 3.6

• Better FRAC results for large arguments

Bug fix:

• RND didn't round correctly certain values in SCI and ENG mode

iPad Screenshots

RPN-45 Calc iPad Screenshot 1
RPN-45 Calc iPad Screenshot 2

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Rated 5/5 based on 1 customer reviews.


5/5 stars

Exactly what I was looking for!

Having owned the
HP-45 since college, I have been using my original for over 37 years, but with batteries hard to find, I wanted something to use when not at my desk. Since I now carry an I pad with me everywhere, this ap solves that problem!

Would like to see landscape mode with the registers shown on the side.

Great ap that I would recommend to anyone who grew up with an HP-45!


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The information may be outdated (2017-03-08 20:40:44). For actual information go to iTunes

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