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 3.8.9

Updated all scientific constants to the latest CODATA 2018 values, and now includes the full list.
Improved accuracy of stored numbers when PCalc isn't running, and for copying and pasting.
Improved the UI for using multiple memories in the watch app and widget.
You can now specify the setting for using multiple memories separately for the watch app and widget.
No longer show the "M" indicator when other memories have contents, but "Use Multiple Memories" is off.
Added new line display types that show a running total for the current calculation, the "Last X" value, and all the memories.
Added an option for displaying all function variables in the registers section.
Fixed a problem searching for functions, conversions, and constants.
Polyhedral dice!

Ratings and Reviews

4.5 out of 5
40 Ratings

40 Ratings

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

Tightly programmed highly configurable calculator

This calculator is one of the best calculators on the app store due to its extremely high customizability and large selection of themes to choose from. The only things the calculator can't do are financial calculations.

But there are still some features to improve the user experience. Namely, there should be a button that you can add that allows you to switch layouts with a press. Siri shortcuts is way to slow for layout switching. Also, on the display each line should have a distinct line size and the tape should have a configurable line size instead of larger tape.

g.byrne ,

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.

Ledavies ,

Scrambled numbers

Great app! Love all the conversion features. My only issue is that on my iPhone 7s running iOS 12.1 the digits are scrambled when the phone is held in portrait mode. They are properly ordered when in landscape mode and they are always correct on my iPad. I can’t use the numbers “8” or “9” in portrait mode on the iPhone because they are out of place and covered by other numbers.

Developer Response ,

Sounds like an accidental button layout edit - press and hold on any button for a few seconds and choose reset from the dialog that appears. That will fix it!


TLA Systems Ltd.
103.5 MB

Requires iOS 9.0 or later. Compatible with iPhone, iPad and iPod touch.



Age Rating
Rated 4+
© 1992 - 2019 James Thomson
In-App Purchases
  1. Small Tip $1.39
  2. Medium Tip $2.79
  3. Large Tip $6.99


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