Simple Calculator
Basic arithmetic with expression display
The Simple Calculator on this page is built for everyday arithmetic that you would otherwise reach for a phone or paper for: totalling receipts, splitting a number into halves, adding hours, working out a small markup, or sanity-checking a figure in a spreadsheet.
Unlike a basic four-function calculator, the input field shows the full expression you are typing — so you can see exactly what is being computed before you press equals. The keypad supports decimals, sign changes, percentage, and a clear button, with the result updating instantly.
What this calculator does
It evaluates standard arithmetic with operator precedence: multiplication and division are applied before addition and subtraction. You can press numbers and operators in any order, and the running expression is shown above the result. This avoids the common confusion on phone calculators where you cannot tell which intermediate value the device is holding.
It also supports keyboard input, so you can type digits, use the operator keys, and press Enter to evaluate without taking your hands off the keyboard.
How calculations are evaluated
Expressions follow the conventional order: parentheses (if present), exponents, multiplication and division left to right, then addition and subtraction left to right. So 2 + 3 × 4 evaluates to 14, not 20.
The percent button divides the current value by 100 — useful for quickly checking things like "20 percent of 60" by entering 60 × 20%, which is evaluated as 60 × 0.20 and returns 12.
Worked example
Suppose you bought three items at $14.99, $7.50, and $22.25, and you want to know the total including 8% sales tax. You can enter:
(14.99 + 7.50 + 22.25) × 1.08
The expression display shows your full input, and the result panel shows $48.66 (rounded). If you want the tax portion alone, multiply the subtotal by 0.08 instead.
When to use this versus a spreadsheet
This calculator is best for one-off questions: a quick discount, a small bill split, or a single multi-step computation. If you need to track many figures, repeat the same formula on different inputs, or keep an audit trail, use a spreadsheet so values are saved and labelled.
Limitations
This is a floating-point calculator, so very long decimal chains may show tiny rounding differences (the same behaviour you see in any browser or programming language using IEEE-754 floats). For currency-precise work over many rows, use a spreadsheet with explicit rounding.
Frequently asked questions
Does this calculator support parentheses?
You can group calculations by computing inner values first and then continuing. For more complex grouping with explicit parentheses, the Scientific Calculator is the better choice.
Can I use my keyboard?
Yes. Number keys, the four basic operator keys, decimal point, Enter (to evaluate), and Backspace all work.
Where is the memory function?
This is intentionally a clean, no-memory calculator. For multi-step work where you need to store intermediate values, a spreadsheet is a better fit.