# PCalc Lite — The Best Calculator > Free scientific calculator with RPN, unit conversions, and undo/redo. (iPhone/iPad app by TLA Systems Ltd..) - Source: https://appshunter.io/ios/app/pcalc-lite/id300311831 (this page in markdown: same URL + `.md`) - Developer: [TLA Systems Ltd.](https://appshunter.io/developer/284666225) - Category: Utilities, Education - Price: Free with in-app purchases - Rating: 4.40/5 from 214 App Store ratings · 528 written reviews indexed - Age rating: 4+ - Requires: iOS 15.0 · 76 MB - Languages: American English - Released: 2008-12-19 - Data updated: 2026-08-20 - Monetization: free with in-app purchases - User reviews in markdown: https://appshunter.io/ios/app/pcalc-lite/id300311831/reviews.md ## What is PCalc Lite? 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! ## Key features - Optional RPN mode - Multiple undo and redo - Unit conversions and constants - Two stylish themes - Apple Watch app ## Pricing and in-app purchases Base price: Free. **One-time purchases** | Purchase | Price | Type | | --- | --- | --- | | Theme Pack | $0.99 | one-time | | Programmer Pack | $2.99 | one-time | | Engineer Pack | $2.99 | one-time | | Power User Pack | $0.99 | one-time | | Multiple Line Pack | $0.99 | one-time | | Conversion Pack | $0.99 | one-time | | Complete Pack | $9.99 | one-time | | Small Tip | $0.99 | one-time | | Medium Tip | $1.99 | one-time | | Large Tip | $4.99 | one-time | | Enormous Tip | $9.99 | one-time | ## What do users think of PCalc Lite? Overall sentiment: positive **Pros** - 🚀 Fast and responsive - 👍 Clean and intuitive interface - 💡 Customizable themes and settings - 🚀 Efficient performance - 👍 Useful conversion tools - 👍 Excellent Apple Watch support **Cons** - 🐛 Occasional lags and crashes - 🔒 Lack of dark mode support - 🔒 Inconsistent icon appearance after upgrades - 🔒 Limitations in RPN mode on Apple Watch - 🔒 Lack of financial calculator functions **Commonly reported bugs** - Calculations sometimes produce unexpected results - Upside-down text censorship feature is problematic - Purchased features not always accessible on Apple Watch **Most requested features** - Add option to display thousands separators - Implement a history function to review past calculations - Provide more customization options for the widget - Add support for sexagesimal angle input and conversion ## Recent user reviews (10 of 528) All indexed reviews: https://appshunter.io/ios/app/pcalc-lite/id300311831/reviews.md ### 5/5 — 支持中文 *2026-07-20* 支持中文 ### 4/5 — Guter Rechner *2026-06-30* Vielseitig,aber gibt es einen Grund, warum es keine Wahl der Sprachen(languages) gibt? ### 4/5 — Feature request: Widget *2026-02-20, version 3.14.3* There used to be a widget but Apple removed the legacy widgets. Please have an interactive widget calc that would be fire ### 3/5 — Eher ein Scherzrechner (42) hat aber sei Jahren keine % Taste *2025-12-06* Ich verstehe nicht, wie man einen derart ausbaufähigen Taschenrechner anbieten kann mit unzähligen Funktionrn, Layoutmöglichkeiten usw. Jedoch wird keine %-Taste abgebildet. Sorry Bro, das disqualifiziert diesen Rechner für mich. Absolut unverständlich, das so grundlegende Dinge fehlen. Wer’s denn unbedingt braucht, muss die Taste selber definieren bzw. eine andere ersetzen und die Funktion selber hinterlegen. Ich bin kein (Mathe-) Nerd. Und habe auch keine Zeit darin umständlich rumzufummeln. Ich fordere den Macher auf, diese grundlegende Funktion nach Jahrzehnten ENDLICH NACHZULIEFERN. Einfach unfassbar. ### 1/5 — Widget STILL doesn't work on iOS 26 *2025-10-08* Just noticed that the Dev has replied to my previous review. Thanks Apple for not sending me a notification! I’ve noticed the same issue with many other calculator widgets in that the numbers need to be typed really slow, else a number or two could be skipped. It’s really annoying! I’d happily make a one time payment if I can just get a working widget like it was before. ———————————————— The widget worked perfectly until the iOS 18 update. Now it wouldn't come up to choose in the widgets section. Without the widget, I have no use for this app as the native iPhone calculator app works just fine. Hope the developers will update it for iOS 18. **Developer response:** Yes, Apple removed all the old style widgets in iOS 18. We tried last year to build a new style widget, and it didn't work well enough for a properly interactive widget. It was quite slow to enter numbers, and if you typed too fast, the system would open up the main app because of bugs in the widget support. It's still something we would like to do, but it's not going to be anywhere as good as the existing widget. We will do what we can! ### 5/5 — Виджет *2025-10-03* Почему не работает виджет на Айфоне?( Исправьте пожалуйста ### 3/5 — Editing button layout *2025-09-19, version 3.14.1* Please allow us to use an icon either an image or an SF Symbol on a button pleaseeeee ### 5/5 — 3.14 UPDATE IS EPIC *2025-09-18, version 3.14* I LOVE the new app icons!!! They are AMAZING! I also love the skins. They are amazing. This is the most beautiful calculator ever! Keep up the good work!! 👏🏻😉 ### 1/5 — Vecchia icona molto più bella *2025-09-13, version 3.14* La vecchia icona era molto più bella. Per il resto nessuna novità e/o differenza rispetto a prima. ### 1/5 — I hate the orange calculator *2025-06-07, version 3.13.1* Change the calculator to be blue just like original, but don’t change the icon to blue ## Frequently asked questions about PCalc Lite ### What does PCalc Lite do? PCalc Lite is a free scientific calculator that offers core functionalities such as an optional RPN mode, multiple undo and redo capabilities, and a comprehensive set of unit conversions and constants. It serves as a free introduction to the more advanced features found in the full version of the app. ### What are the key features of PCalc Lite? Key features include an optional RPN mode for advanced users, multiple undo and redo functions for easy error correction, and a wide range of unit conversions and constants. It also comes with two stylish themes and an Apple Watch app for on-the-go calculations. ### Is PCalc Lite free to use? PCalc Lite is free to download and use, offering a substantial set of features. For users who require even more advanced capabilities, such as engineering and scientific notation, hexadecimal, octal, and binary calculations, or a paper tape, additional features can be purchased individually or as a bundle through in-app purchases. ### What devices is PCalc Lite compatible with? PCalc Lite is designed for iPad and also includes an Apple Watch app, allowing you to perform calculations directly on your wrist. The description specifically mentions it as a great choice for your new iPad. ### Who would benefit from using PCalc Lite? This app is ideal for anyone who needs a powerful and versatile calculator, including scientists, engineers, students, programmers, and individuals who appreciate a feature-rich tool. The optional RPN mode and extensive unit conversions make it particularly useful for technical and academic fields. ## Version history (last 5 releases) ### 3.14.4 — 2026-03-12 Menus are more consistent with the macOS version. Fixed a problem speaking negative numbers. Fixed a problem displaying overflows. With the "Power User Pack" installed: Added an option to use woodworking fractions, in the Advanced settings. Added an option to use the Indian numbering system for thousands separators, in the Advanced settings. Added an option to ignore trailing operators, on by default, in the Advanced settings. Added an option to automatically press Equals before "M+" and "M in" operations, on by default, in the Advanced settings. The "Clear on Open" option will now only trigger if you haven't used PCalc in the last five minutes. With the "Theme Pack" installed: Added an option to allow all themes for dark or light mode, in the Theme settings. Added an option to hide any gloss effects on the display, in the Theme settings. The user interface mode setting is now independent of the theme mode setting. Fixed a problem with the user interface dark mode settings. With the "Conversion Pack" installed: Added "Flow Rate", "Jewelry", and "Typography" sections to the conversions. Added "tau" to the constants. You can now use combinations and permutations in user functions and conversions. Now show a preview image when picking an SF Symbol. With the "Engineer Pack" or "Programmer Pack" installed: Added "norm", "sci", "eng", "acc", "frac", "nCr", "nPr", and "tau" buttons to the layout editor. Added "tau" as a 2nd function of "pi" in most layouts. Improved the layout editor with all the commands and keyboard shortcuts from the macOS version. You can now edit buttons to display any SF Symbol as an image. ### 3.14.3 — 2025-10-24 Improved support for iOS 26, iPadOS 26, and watchOS 26. With the "Engineer Pack" or "Programmer Pack" installed: Fixed a problem importing settings and other files on iPadOS 26. Fixed a problem with the editing toolbar on iOS / iPadOS 26. Fixed a crash when starting to edit a layout on iOS / iPadOS 26. With the "Conversion Pack" installed: Fixed a crash when starting to edit constants. With the "Theme Pack" installed: Fixed a crash with certain custom tint colors. ### 3.14.2 — 2025-09-28 Improved support for iOS 26, iPadOS 26, and watchOS 26. Added some icons that are always light or dark, regardless of system setting. Added dark and tinted variants for the "2016 Earth-2" icon. The "Chalk" and "Wood" icons have come back, due to popular demand. Fixed a problem with the tape sidebar not appearing. Fixed a problem with button text being too small or too big. ### 3.14.1 — 2025-09-19 Improved support for iOS 26, iPadOS 26, and watchOS 26. The "Circuit" icon has come back, due to popular demand. Added a Control Center button to quickly launch the app on watchOS 26 and later. Now copy the old tint color from the "Dark Night" theme to "Dathomir" by default. Fixed a problem forgetting the chosen layout. Fixed a problem with the "Dathomir" theme in RPN mode. Fixed a problem always resetting the dark theme to "Dathomir". Fixed a problem with the "New Calculator" button getting truncated. ### 3.14 — 2025-09-12 Added support for iOS 26, including dark and tinted icons. Added support for iPadOS 26, including resizable windows and a full menu bar. Added support for watchOS 26, including the latest watches and new complications. Added a Control Center button to quickly launch the app on iOS 18 and later. Added an "exp" button to the Apple Watch app. Updated the scientific constants to include the latest CODATA 2022 values. Most keyboard shortcuts from the Mac version now work on iOS / iPadOS 26. Fixed various bugs. PCalc for the Apple Watch now requires watchOS 9 or later. PCalc now requires iOS / iPadOS 15 or later. Apple removed all the old-style widgets in iOS 18, so PCalc's widget is currently unavailable. ## Apps similar to PCalc Lite | App | Rating | Price | Category | | --- | --- | --- | --- | | [Calculator +](https://appshunter.io/ios/app/calculator-plus/id351815470) | 4.6 (9,997) | Free | Utilities | | [Haseba Calculator](https://appshunter.io/ios/app/haseba-calculator/id1121281655) | 4.6 (3,795) | Free | Utilities | | [Calculator₊](https://appshunter.io/ios/app/calculator/id398129933) | 4.7 (1,726,794) | Free | Utilities | | [Calculator HD Pro Lite](https://appshunter.io/ios/app/calculator-hd-pro-lite/id571121141) | 4.6 (51,312) | Free | Utilities | | [The Best Calculator - Calc Pro](https://appshunter.io/ios/app/the-best-calculator-calc-pro/id451544502) | 4.6 (4,710) | Free | Utilities | | [Calculator +ㅤ](https://appshunter.io/ios/app/calculator-plus/id1597933199) | 4.6 (4,519) | Free | Utilities | ## More apps by TLA Systems Ltd. - [PCalc](https://appshunter.io/ios/app/pcalc/id284666222) - [PCalc TV](https://appshunter.io/ios/app/pcalc-tv/id1052173825) - [Dice by PCalc](https://appshunter.io/ios/app/dice-by-pcalc/id1468680083) - [About by PCalc](https://appshunter.io/ios/app/about-by-pcalc/id1613982997) All apps by TLA Systems Ltd.: https://appshunter.io/developer/284666225 ## Related topics [pcalc lite](https://appshunter.io/ios/topics/pcalc-lite) · [pcalc](https://appshunter.io/ios/topics/pcalc) · [rpn calc](https://appshunter.io/ios/topics/rpn-calc) · [citbi calc](https://appshunter.io/ios/topics/citbi-calc) · [logcaliper](https://appshunter.io/ios/topics/logcaliper) · [pump power calculator](https://appshunter.io/ios/topics/pump-power-calculator) · [engineering calculator hvac](https://appshunter.io/ios/topics/engineering-calculator-hvac) · [tpass.calc](https://appshunter.io/ios/topics/tpass-calc) · [best proportion calc](https://appshunter.io/ios/topics/best-proportion-calc) · [halcyon calc lite](https://appshunter.io/ios/topics/halcyon-calc-lite) · [touch rpn calc](https://appshunter.io/ios/topics/touch-rpn-calc) · [resistor color code calc lite](https://appshunter.io/ios/topics/resistor-color-code-calc-lite) · [contact center calculator](https://appshunter.io/ios/topics/contact-center-calculator) · [programmer calculator lite](https://appshunter.io/ios/topics/programmer-calculator-lite) · [pixel density calculator](https://appshunter.io/ios/topics/pixel-density-calculator) --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-20.*