PCalc Lite 4+

The Best Calculator

TLA Systems Ltd.

    • 4.5 • 177 Ratings
    • Free
    • Offers In-App Purchases


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.PCalc Lite is a fully functional and free taste of our very popular scientific calculator. It includes an optional RPN mode, multiple undo and redo, unit conversions and constants, as well as two stylish themes and our highly praised design. A great choice for your new iPad!

If you like what you see, the full version has many more settings and themes, a paper tape, engineering and scientific notation, and full support for hexadecimal, octal, and binary calculations. You can also now purchase extra features directly from inside PCalc Lite. Buy them individually, or buy everything.

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

What’s New

Version 3.12.1

Added support for iPadOS 16, including Stage Manager.
Added support for multiple windows on iPad.
Improved theme drawing performance.
Fixed a problem with the recent conversion text getting too small with long unit names.
Fixed a problem with the "Round to Floor" and "Round to Ceiling" user function commands with negative numbers.
Fixed a problem with the "Modulo" function with negative numbers.
Fixed a crash when clearing a memory from the contextual menu.

With the "Power User Pack" installed:
Added a new per-calculator rotation lock option for iPhones on iOS 16.

With the "Conversion Pack" installed:
Added an "EV Efficiency" section to the conversions.
Fixed an ambiguity when displaying some currency symbols like Yen and Yuan.
Fixed some cosmetic problems with the user functions and conversions editor.
Fixed a problem editing the name and images for custom function, conversion, and constant categories.

With the "Engineer Pack" or "Programmer Pack" installed:
Now interpret text starting with "0x", "0o", or "0b" as hex, octal, and binary numbers.
Improved handling of button selection in the layout editor.
Fixed a crash when adding or duplicating a layout on iPad.

Ratings and Reviews

4.5 out of 5
177 Ratings

177 Ratings

9235S ,

Excellent choice

There are several “full feature” calculators in the App Store, and this is one of them. PCalc is an excellent choice, if you want a calculator that does number manipulation, this may be the one for you. If you need graphing, or ability to solve quadratic equations, you need to look elsewhere.

What I’d like to see is a user manual as part of the app, not just a link to an online location.

Also, if you do buy the packs, your icon is indistinguishable from the free version. I have all the packs, except the programmer pack (those days are in the distant past for me). There should be a difference in appearance and name - perhaps you can call it PCalc Plus, instead of PCalc Lite, and add the “+” symbol to the icon?

Finally, do the currency conversions get automatically updated? If so, how often? If no, how do you update manually?

William Timberman ,

James Thomson is a genius

You want to see the real potential of mobile device software? You want to see superior visual aesthetics? Superior app functionality? Superbly intuitive human interface design? Exemplary respect for the user, including first-rate customer support? All of that in single app? Then download p-calc right now, and for God’s sake, pay the man. He’s a very rare talent indeed, and we’d all be the poorer if he decided to go somewhere else to make a living.

meta732 ,

iPhone X, iOS 11.x

Orders of magnitude better than the stock calculator and so many others. The option to add only the additional features that one requires make for an affordable, intuitive experience. Look no further if you want an app that is maintained consistently and always works with the latest devices (even the free version without any additional features unlocked) because PCalc Lite delivers. These are the developers that we should support.

App Privacy

The developer, TLA Systems Ltd., indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy.

Data Not Linked to You

The following data may be collected but it is not linked to your identity:

  • Diagnostics

Privacy practices may vary, for example, based on the features you use or your age. Learn More


  • Game Center

    Challenge friends and check leaderboards and achievements.

  • Family Sharing

    Some in‑app purchases, including subscriptions, may be shareable with your family group when Family Sharing is enabled.

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