Math & Everyday
Basic Calculator
Everyday arithmetic with full keypad entry.
🔒 Runs entirely in your browser — nothing here is ever uploaded
CalcoTools · Basic Calculator · generated 8/23/2026, 12:23:39 PM
About the Basic Calculator
A four-function calculator for everyday arithmetic — addition, subtraction, multiplication, and division — plus percentage and sign-change shortcuts, computed instantly as you tap.
How to use it
- Tap digits and an operator to build a calculation, like a physical calculator.
- Press = to see the result.
- Use C to clear, ± to flip the sign, or ⌫ to backspace.
Formula
result = a (operator) b, applied left to right as each operator is pressed — matching how a physical calculator works, not algebraic order of operations.
Worked example
Typing 250 + 18% computes 18% of 250 (45), the same way most handheld calculators handle an inline percentage.
Recommendations
- • Percent (%) applies to the number immediately before it — handy for quick tips, discounts, or splitting a bill.
- • Use ± to flip a number's sign without retyping it.
- • For anything involving parentheses or trig functions, switch to the Scientific Calculator instead.
Frequently asked questions
No — like most physical calculators, each operation applies as soon as you press the next operator, left to right. For expression-based math with proper order of operations, use the Scientific Calculator instead.