Big Display Calculator
Full-width desk calculator with running tape audit history, memory storage, and keyboard entry.
Calculations log here automatically.
Full Keyboard Support
Use physical number keys, numpad keys, +, -, *, /, and Enter to calculate at speed.
Running Tape History
Every completed operation records a timestamped audit trail on the virtual paper tape, allowing quick reconciliation and one-click clipboard copying.
Independent Memory Register
Standard desk calculator memory keys (MC, MR, M+, M-) preserve running totals across calculations.
Frequently Asked Questions
Why does 0.1 + 0.2 equal 0.3 here when other calculators show 0.30000000000000004?▼
Most programs use binary floating-point numbers, which cannot store 0.1 exactly. This calculator does decimal arithmetic with exact integers instead, so everyday sums come out the way you would do them on paper.
How many digits can I enter?▼
You can enter up to 20 digits in a single number. Results of addition, subtraction and multiplication are exact, however long they grow.
What happens if I divide by zero?▼
The display shows Error rather than infinity or a misleading number. Clear it and carry on.
Is there a history of my calculations?▼
Yes. A tape records each calculation so you can check your working, and you can copy results from it.
Is my data sent to a server?▼
No. The calculator runs entirely in your browser, so nothing you enter is uploaded, stored or tracked. Once the page has loaded it keeps working without a connection.