Can I use my keyboard?

Yes — click into the display and use the number keys plus +, -, *, /, and Enter for equals.

How many decimal places does it show?

It shows the precision your browser's floating-point math returns, so very long results can include small rounding artifacts typical of binary floating-point arithmetic.

Can I chain multiple operations, like 5 + 3 × 2?

Yes, but left-to-right, not by standard order of operations — 5 + 3 = 8 first, then × 2 = 16, the way a basic physical calculator works, not the 11 you'd get from algebraic precedence.

Is there a memory or history function?

Not currently — each calculation starts fresh once you press C or begin a new expression.

Why does dividing by zero show an error instead of infinity?

Division by zero is mathematically undefined, not infinite, so the calculator flags it rather than showing a misleading number.

Can I calculate a running total, like adding up several receipts?

Yes — press + after each number to keep a running sum; the calculator carries the total forward until you press = or C.

Does this calculator save or send anything I type?

No — every calculation happens entirely in your browser. Nothing you enter is transmitted or stored anywhere once you close or refresh the page.

Why does a long decimal sometimes look slightly off, like 0.1 + 0.2 not showing exactly 0.3?

That's standard binary floating-point behavior, not a bug in this calculator — the same rounding quirk appears in virtually every calculator and programming language, since 0.1 and 0.2 can't be represented exactly in binary.

Basic Calculator

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.

100% Free Runs in Your Browser No Sign-Up Required

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.

Keyboard shortcuts

Key	Action
0–9	Enter digits
.	Decimal point
+ − * /	Operators (× and ÷ also work directly)
Enter or =	Calculate the result
Backspace	Delete the last digit
Escape or Delete	Clear (same as the C button)

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.

Related tools

Scientific Calculator

Percentage Calculator