Web Tools
RPN Calculator
Evaluate Reverse Polish Notation (postfix) expressions with step-by-step stack visualization. Supports arithmetic operators, math functions (sqrt, sin, cos, log), and constants (pi, e). Includes infix-to-RPN converter using the shunting-yard algorithm. Runs entirely in your browser — your data never leaves your machine.
rpn calculator postfix stack math shunting-yard reverse-polish
Published May 31, 2026
All interactive tools run entirely in your browser. Your data never leaves your device.
How It Works
Enter a Reverse Polish Notation expression with space-separated tokens. Numbers are pushed onto the stack, operators pop operands and push results. Watch the stack evolve step by step as each token is processed.
Features
- Arithmetic operators: + - * / % ^ (power)
- Math functions: sqrt, abs, floor, ceil, round, sin, cos, tan, log (base 10), ln (natural), neg
- Constants: pi, e
- Stack visualization: see the stack state after each operation
- Step-by-step trace: detailed description of each computation step
- Infix converter: convert standard math expressions to RPN using the shunting-yard algorithm
- 5 preset examples: basic addition, complex expression, square root, power/division, circle area
- Private: all processing runs in your browser — no data transmitted
Use Cases
- Learning how stack-based calculators work
- Evaluating expressions without worrying about operator precedence
- Converting between infix and postfix notation
- Understanding the shunting-yard algorithm
- Quick calculations with scientific functions