PCalc is the powerful choice for scientists, engineers, students, programmers, or indeed anybody looking for a feature rich calculator. It includes an optional RPN mode and multi-line display, a choice of button layouts, an extensive set of unit conversions and constants, a paper tape, multiple undo and redo, engineering and scientific notation, as well as support for hexadecimal, octal, and binary calculations.

Includes an Apple Watch app, so you can calculate on your wrist!

What's New

Version 3.7.5

Added an option to show x10 in scientific notation, in the Advanced settings.
Added options to turn off the labels and info on the display.
The display is now smarter about using the available space.
You can now change the tint color for the themes "A Touch of Color", "Blue Sun", "Brawn", "Flux", "Primary Colors", "Rough Draft", and "Widget".
You can now use hyperbolic trigonometry in user functions and conversions.
The About screen now has an ambient electronic soundtrack composed by Squillopian.
Improved the iPhone X support yet again.

Ratings and Reviews

4.6 out of 5

15 Ratings

15 Ratings

Comprehensive scientific calculator with a nice UI


Nice design, lots of features, and a tape make it worth the price of admission. Conversions and constants likely make it more useful for scientists and math-types... The only thing I wish it had was financial calculator functions, such as TVM, mortgage tables, and percent change. The developer seems to be very open to recommendations and suggestions. I’ll likely give it 5 stars if these features get added in the future.

Best calculator I ever used on iOS


Fast, clear interface and RPN support. Has all the functions I need and the ones I don’t; don’t get in the way. Perfect.

Wish list

PLEASE FIX THIS...,,,,,!!!!

-New theme that looks like iOS 11 default calculator.

-Button colors.

-Camera and video button that is accessible in layout editing (takes a picture like a secret camera but it’s secret meaning that it doesn’t show.;) )

-More customizable buttons. Make it so that we can make it 5 buttons per row, or 6. Meaning we can have hybrid layouts with a simple layout on the bottom, and then the scientific functions on the upper part.

-Customizable display font sizes per line.

-Financial calculator. Also, a tax button with a customizable tax percent value.
PCalc is still the best calculator app without this. It is the best calculator app!

Developer Response

If you have an existing answer, if you press -666 + 668.6, it will treat it like you are continuing the calculation. Press AC at the start of a new calculation in this case, or use the sign button instead of starting with a minus.


TLA Systems Ltd.
88.7 MB
Requires iOS 8.0 or later. Compatible with iPhone, iPad and iPod touch.
Age Rating
Rated 4+
© 1992 - 2018 James Thomson
In-App Purchases
  1. Small Tip $1.39
  2. Medium Tip $2.79
  3. Large Tip $6.99


  • Family Sharing

    Up to six family members will be able to use this app with Family Sharing enabled.

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