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PCalc

A feature-rich scientific calculator with RPN, conversions and a paper tape

TLA Systems Ltd. · Utilities · $9.99

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iPhone screenshots

iPad screenshots

How it uses iPhone Duo

PCalc's version 3.15 release notes (October 19, 2026) say the update "Added support for iPhone Duo and other new devices." The developer does not describe a layout specific to the foldable, so it is listed as Compatible. We have not yet tested it on a device.

What’s New

Version 3.15 · October 19, 2026

Added support for iOS 27, iPadOS 27, and watchOS 27. Added support for iPhone Duo and other new devices. Added an optional grid view layout for the conversions, functions, and constants. Added a "Data Rate" section to the conversions. Powers are now worked out from the right, so 2 ^ 3 ^ 2 is 512. Operator precedence now follows mathematical convention more closely. Rounding and truncating are now consistent throughout the app. Fixed a problem with the percentage button. Fixed a problem with the "Last X" button. Fixed a crash with damaged settings files. Fixed a crash with speech when any "Enhanced" or "Premium" voices were installed. Fixed a variety of other small bugs and edge cases.

About this app

PCalc from TLA Systems is a long-standing scientific calculator for iPhone, aimed at scientists, engineers, students, programmers and anyone who needs more than the built-in Calculator. It offers an optional RPN mode, a multi-line display and a choice of button layouts, along with an extensive library of unit conversions and constants. A paper tape keeps a record of calculations, and multiple levels of undo and redo are available. It handles engineering and scientific notation and can work in hexadecimal, octal and binary, which is useful for programming tasks. An Apple Watch app is included for calculations on the wrist. PCalc is a paid app, with additional extras available as in-app purchases. Version 3.15, released on October 19, 2026, adds support for iOS 27, iPadOS 27 and watchOS 27, and the release notes state that it adds support for iPhone Duo and other new devices. The same update introduces an optional grid view for conversions, functions and constants, a new Data Rate conversion section, right-to-left evaluation of powers, operator precedence that follows mathematical convention more closely, and a range of bug fixes.

App Store descriptionWritten by the developer.

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!