Online Calculator
A simple online calculator for adding, subtracting, multiplying, dividing and taking percentages. Tap the keys or type on your keyboard. It follows the normal order of operations, supports parentheses, and keeps a history of your results so you can reuse them.
How it evaluates
The calculator reads the whole expression and applies the standard order of operations: parentheses first, then multiplication and division from left to right, then addition and subtraction. So 2 + 3 × 4 = 14, and (2 + 3) × 4 = 20.
The percent key converts the number before it into a fraction: 50% becomes 0.5. To take 15% off 80, enter 80 − 80 × 15% or 80 × (1 − 15%). The ± key flips the sign of the number you are typing.
Examples
| Enter | Result |
|---|---|
| 12.5 × 8 | 100 |
| 250 − 250 × 20% | 200 |
| (45 + 55) ÷ 4 | 25 |
| 1,299 × 1.18 | 1,532.82 |
Keyboard shortcuts
Digits and the decimal point type as normal. Use + and − (the minus key), * or x for multiply, / for divide, % for percent, and ( ) for grouping. Enter or = evaluates, Backspace deletes one character, Escape clears the input and AC clears everything. Click any result in the history to bring it back into the calculator.
Need trigonometry, powers or logarithms? Use the scientific calculator. For money questions with formulas and worked examples, browse the calculators in the categories above.
Frequently asked questions
Does this calculator follow order of operations?
Yes. It uses standard precedence: parentheses, then multiplication and division, then addition and subtraction, all left to right within the same level. This matches what you would get on paper or in a spreadsheet.
How does the percent key work?
It divides the preceding number by 100, so 20% is 0.2. To add 20% to 500, enter 500 × (1 + 20%) or 500 + 500 × 20%. Both give 600.
Can I use it on my phone?
Yes. The keys are sized for touch and the layout fits a phone screen. Your history is shown above the input while the page is open and is not stored anywhere.
Why does 0.1 + 0.2 show 0.3?
Computers store decimals in binary, so 0.1 + 0.2 is internally 0.30000000000000004. The calculator rounds results to 12 significant figures for display, which removes this noise without affecting real calculations.
Related calculators
Last updated . Formulas are shown on the page and checked against the worked example.
Results are computed in your browser using double-precision arithmetic. Very long decimals are rounded to 12 significant figures for display.