Professional online RPN calculator with stack/history replay, named memory profiles, session summary, and precision controls (fixed/scientific/engineering).
RPN is a mathematical notation where operators follow their operands. Instead of '2 + 2', you type '2 Enter 2 +'. It eliminates the need for parentheses and equal signs, making complex calculations faster and more efficient.
The stack stores your numbers. Each time you press Enter, the number is pushed onto the stack. Operations (like +, -, ×, ÷) take the top two numbers, perform the calculation, and push the result back. Use 'Swap' to exchange the top two numbers.
RPN calculators are often faster for complex calculations because you never need parentheses or an equals sign. Many engineers, scientists, and financial professionals prefer RPN for its efficiency and reduced keystrokes.
Yes. History view includes operation replay, so you can step through stack transitions and inspect before/after states. You can also push prior results back to the stack.
You can choose Auto, Fixed, Scientific, or Engineering notation and set precision digits. This is useful for engineering and repeatable workflow formatting.
Yes. Memory profiles let you name and switch register sets (for example, per project or per client) without losing the active session stack.
Yes. In guest mode you can export your calculations to JSON. Signing in adds PDF and CSV export. Click the export button to download your results — useful for record-keeping, sharing, or importing into other tools.
Yes. Your calculation history is saved automatically. As a guest you can keep up to 50 calculations per workspace on your device. Sign in for free to keep up to 100 per workspace and access them from any device.
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RPN Calculator
Reverse Polish Notation calculator with replay, precision controls, and named memory profiles.