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 3.8.8

Fixed a problem installing the watchOS app on Series 4 watches paired with an iPhone 6 Plus.

Ratings and Reviews

4.4 out of 5
7 Ratings
7 Ratings
WxYtg56$9oKK ,

The BEST for engineering 🌟🌟🌟🌟🌟

SI Prefixes at last on an iPhone calculator!

Absolutely one of my most sought after features for radio electronics calculations! Thank you James Thompson and TLA Systems Ltd!

I suggested this to the developer some time ago and have been checking the updates ever since. Just now with this latest update my wishes have come true.

Ever since Uni, I've always gone for my trusty old FX calculator as it includes SI Prefixes and makes electronics engineering calculations so much easier. Now I can server my ties and rely wholly on PCalc. Entry of SI Prefixes can easily be done by hitting EXP after your value & selecting for example -6 for micro. One day I'm hopeful that these will show on the number key pad with the 2nd function. But for now it's just awesome!

If you're looking for the best scientific / engineering calculator for iOS or macOS, buy this! You won't regret it. 5 Stars! 🌟🌟🌟🌟🌟

kiwiholden ,

Only ad free full featured calculator app

This should be at the top of the App Store it is the best calculator app out there with options for every type of math.
I only need it for the basic stuff but i appreciate the work that's gone into this app.
The one I had before this was the top of the search results but had pop up ads and even auto open links it was a spammy piece of junk.
Love the spilt screen mode

Norton from Oz ,

Best Watch implementation

PCalc has the best implementation on the Apple Watch. You can delete one digit at a time, not just All Clear (AC), and you can tell which operator (+, - etc) you are using.

In addition to clicking on the "...", I wouldn't mind being able to swipe between screens.

Great stuff.


TLA Systems Ltd.
99.6 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. Conversion Pack $1.49
  2. Complete Pack $14.99
  3. Multiple Line Pack $1.49


  • Game Center

    Challenge friends and check leaderboards and achievements.

  • Family Sharing

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

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