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