My RPN Calc 5.10

The RPN Calc application for iOS presents a versatile calculator environment characterized by a streamlined and minimalist interface suitable for various computational needs. Its design draws inspiration from the iconic Hewlett-Packard HP-10C series, notably the HP 12C and HP 15C models from the 1980s, merging classic functionality with modern usability.

The calculator offers comprehensive features that encompass basic arithmetic operations, logarithmic and trigonometric functions, statistical analysis, financial calculations, and macros for programmable tasks. It also provides robust support for complex numbers alongside tools capable of solving quadratic, cubic, and quartic equations, as well as performing numerical root finding and integration.

While it does not serve as an exact emulation of the HP-1xC series, it effectively replaces these models for a broad range of scientific, statistical, and financial applications.

An extensive user manual filled with practical examples is available on the application's official website to facilitate user onboarding and mastery of its capabilities.

Major functionalities include:

• RPN input method
• Basic arithmetic (+, −, ×, ÷), reciprocal (1/x), sign change (+/−)
• Trigonometric, hyperbolic functions, logarithms
• Percentage calculations (additive, subtractive, variation, total)
• Date computations
• Full support for complex numbers and Gaussian integers
• Equation solving for second-, third-, and fourth-degree polynomials
• Macros enabling simple programming routines
• General-purpose root finder and numerical integration tools
• Unit conversions (e.g., temperature, distance)
• Access to a comprehensive collection of constants (universal, mathematical)
• Integration with BaseCalc for radix conversions

Statistical capabilities include:

• Single- and multi-variable analysis
• Sums (Σx, Σx², Σy, Σy², Σxy)
• Means (arithmetic and weighted), standard deviation
• Linear regression and correlation coefficient calculations
• Linear estimation methods

The financial functions encompass:

• Calculations of simple and compound interest
• Cash flow analysis tools such as NPV and IRR
• Depreciation methods including straight-line (SL), declining balance (DB), and Sum-of-Years-Digits (SOYD)

The latest integration with Apple Watch expands the calculator's accessibility by allowing users to perform standard operations—such as arithmetic calculations, trigonometric functions, logarithms—directly from their wrist. This includes RPN input and essential mathematical functions for rapid computations on the go.