About
A professional scientific calculator utilizing Reverse Polish Notation for efficient calculations. It features a full stack display, comprehensive scientific functions, and a clean interface, ideal for engineers, scientists, and RPN enthusiasts.
What's New in RPN Calc Pro
1.4
March 31, 2026
• Improved error handling — divide by zero, invalid operations now show a clear "Error" state instead of silent failures • Calculator state now persists between app launches — your stack, memory, and mode settings are saved • Larger, more readable button labels and stack display • Scientific notation entry improved — ± now correctly toggles exponent sign • T-register now replicates after operations, matching classic HP RPN behavior • VoiceOver accessibility support added for all buttons and display registers • Removed unused code and reduced app footprint
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FAQ
What is RPN Calc Pro?
RPN Calc Pro is a professional scientific calculator that uses Reverse Polish Notation (RPN) for calculations. It offers a clean interface and a full 4-level stack display, making it efficient for complex mathematical operations.
How much does RPN Calc Pro cost?
RPN Calc Pro is a paid application, available for $2.99. There are no subscriptions or in-app purchases required after the initial purchase.
Does RPN Calc Pro have ads?
No, RPN Calc Pro is completely ad-free. The description explicitly states 'NO ADS. NO TRACKING. JUST CALCULATIONS.'
What devices is RPN Calc Pro available on?
Currently, RPN Calc Pro is supported on iPhone devices. The app is rated for ages 4 and up.
How often is RPN Calc Pro updated?
The latest version of RPN Calc Pro is 1.4, which was last updated on March 31, 2026. This indicates a recent update, suggesting ongoing support.
What kind of functions does RPN Calc Pro offer?
RPN Calc Pro includes a complete scientific function set, trigonometric functions (sin, cos, tan, and inverses), logarithmic and exponential functions, and power/root operations. It also supports stack manipulation like swap and roll.
Is RPN Calc Pro suitable for beginners?
While RPN Calc Pro is designed for professionals and enthusiasts, it can be learned by beginners who appreciate efficient calculation methods. The app provides a clean interface to help with the learning process.
What makes RPN Calc Pro different from standard calculators?
RPN Calc Pro uses Reverse Polish Notation, where operators follow operands, eliminating the need for parentheses. This method is often preferred by engineers and scientists for its speed and intuitiveness once mastered.