WP 34s is the most powerful and complete implementation of a classic RPN scientific calculator. Now available on iOS too (see the support site for other emulators and for the real stuff).

The function set of the WP 34S is based on the most powerful programmable RPN calculators built so far and we expanded the set, incorporating programmer functions (base 2, 8 & 16), a fraction mode, probability distributions, a stopwatch...
We also included numerous additional useful functions for mathematics, statistics, physics, engineering, programming, I/O, etc., such as:

+ Euler’s Beta and Riemann’s Zeta functions, Bernoulli and Fibonacci numbers, Lambert’s W, the error function, and the Chebyshev, Hermite, Laguerre, and Legendre orthogonal polynomials (no more need to carry heavy printed tables),
+ many statistical distributions and their inverses: Poisson, Binomial, Geometric, Cauchy-Lorentz, Exponential, Logistic, Weibull, Lognormal, and Gaussian,
+ programmable sums and products, first and second derivatives, solving quadratic equations for real and complex roots,
+ testing for primality,
+ integer computing in fifteen bases from binary to hexadecimal,
+ extended date and time operations and a stopwatch3 based on a real-time clock,
+ financial operations such as mean rate of return and margin calculations,
+ 88 conversions, mainly from old Imperial to universal SI units and vice versa,
+ 50 fundamental physical constants as accurate as used today by national standards institutes such as NIST or PTB, plus a selection of important constants from mathematics, astronomy, and surveying,
+ Greek and extended Latin letters covering the languages of almost half of the world’s population (upper and lower case in two font sizes), plus mathematical symbols.

A beginner manual can be downloaded at and a full, very complete version at

What’s New

Version 1.14

Now supports iPhone XR

Ratings and Reviews

4.4 out of 5
11 Ratings
11 Ratings
Industrial Emgineer ,

Matrices Unusable

All the positive reviews must be from people who don’t use a key feature. The "descriptor" method the manual describes to enter a matrix is unusable. When pressed in the HP Forum, a developer admitted matrix ops “weren't user friendly.” I'm grateful to this app. It showed how lousy this calc is before $ was spent on an actual machine.

Brother Sam ,

Well done

an emulated version of the WP34s calculator. This was written by folks who used HP calculators in their field, so they know what's up. It's full featured, including scientific function, calculus, matrix, complex, and computer maths functions, and it's RPN.

Seriously, give it a go! If you like RPN calculators you'd do yourself a disservice by passing this one up. I have the actual calculator and I love it. Extremely useful at university! Even better now that I can run it on my mobile!

MLengineer ,


Wow... This is a RPN aficionado's calculator. Has most all the functions you commonly need and works great. For fun I timed how long it takes my wife, a math major, to do complex calculations with std calc vs me using the rpn. I can consistently do the number crunching in 50% less time and with more accuracy. Interestingly, she could reduce her time by ~40% even after just learning how to use an rpn.


Pascal Meheut
11.5 MB

Requires iOS 8.0 or later. Compatible with iPhone, iPad, and iPod touch.



Age Rating
Rated 4+
© 2013, Pascal Méheut


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