Form calculator
Simple Financial
A straightforward non-RPN calculator for common financial operations.
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Calculators
The complete STENDEC calculator collection—browser-ready RPN machines, focused financial tools, and Touch RPN for iOS and Android.
Two operating systems
Touch RPN for mobile.
The dedicated iOS and Android pages show all seven calculator flavors available on each platform.
Choose a calculator flavor
Financial
Time value of money and essential financial functions.
Open calculatorFinancial Advanced
More memory, algebraic mode, and expanded financial workflows.
Open calculatorBlack-Scholes
Options pricing with calls, puts, implied volatility, and Greeks.
Open calculatorSimple Scientific
Essential RPN scientific functions with a focused keypad.
Open calculatorScientific
Programming, statistics, and core scientific functions.
Open calculatorAdvanced Scientific
Matrices, complex numbers, numerical methods, and programs.
Open calculatorProgrammer
Base conversions, word sizes, bitwise operations, and integer tools.
Open calculatorSeven working emulators
Every classic flavor now runs here.
Each model has its own redesigned showcase, working browser calculator, purpose summary, and mobile counterpart.
Options
Black-Scholes Analysis
Use the detailed or simplified forms for options pricing.
Open options toolsRisk
Option Margin
Estimate option-writing margin requirements with the original tool.
Open estimator