RPNscfi

RPNscfi is a 15-digit RPN calculator with unlimited stack depth. It supports numbers with magnitudes greater than or equal to 2^{-1022} (approximately 10^{-308}) and less than 2^{1024} (approximately 10^{308}).

With ease of use and beauty in mind, RPNscfi is designed for every family member (parents and students) and for professionals (in finance, engineering, and science). It combines a comprehensive set of household financial calculations (loans, mortgages, "what-if" analyses), statistical calculations, and scientific/engineering functions into a single package.

■ Tap “OPTIONS” and then the [Help] key to view the User’s Manual.
• Jump to Section 1.3 for a quick tour, then continue reading Section 1.4.
• If you are not familiar with an RPN calculator, please refer to Section 2.6.

■ VoiceOver-enabled universal app
• Supports macOS as a “Designed for iPad” iOS application

■ Financial Calculator
• Mortgage and loan calculations
• Amortization schedule (copy or e-mail in CSV or text formats; select and paste)
• Savings plan and pension fund calculations
• Savings account, appreciation, and depreciation calculations
• Lease calculations with/without residual value
• Interest rate conversions (e.g., dividend to annual interest rate and vice versa)
• Calendar functions with dynamically localized date output
• Helps you understand and manage your budget with “what-if” analyses

■ Statistics Calculator
• Mean (μ), population (σ) and sample (s) standard deviations, weighted mean (μ.w)
• Normal, log-normal, and log-log least-squares regression analyses (tested with a million data samples)
• Equation output, x and y estimators, r: Pearson product-moment correlation coefficient
• Powerful editing feature: edit any record; export/import your data between iOS devices and desktop computers
• Test generator to get acquainted with the statistics calculator
• Regression graph feature: guides you to visually navigate your datasets

■ Scientific Calculator
• Common trigonometric, hyperbolic, logarithmic, and exponentiation functions (bases e, 10, and 2)
• Arbitrary rounding, mod operation, various ceil and floor functions, percentage functions
• Factorial function, binomial coefficient, and greatest common divisor calculations

■ Unit System Conversion Calculator
• Simple yet useful for addressing daily metric to/from imperial conversion needs.
• 5 length, 5 area, 2 weight, 2 volume, and temperature, plus a little more cross-unit conversions.

■ Built-in PDF User’s Manual
• E-mail or print the User’s Manual
• All financial features are explained and demonstrated with annotated examples

■ Additional Features
• Easy-to-review, on-demand, non-intrusive tape
• Built-in tape history browser and editor
• Gives you a true record of all calculations
• Includes copy, selective copy, and e-mail functions

■ Easy configuration via gestures
• US and EU number formats
• 5 number notations: DEC, FIN, ENG, SCI, UNF
• 2 trigonometric angle modes: DEG, RAD
• Fixed-point (FIN) and fixed-digit (ENG) number notations
• 4 keypad themes, 3 keypad fonts, 3 display fonts, 3 tape fonts, and 4 display and tape font colors