Click the buttons or use your keyboard — numbers, operators, Enter for equals, Backspace to delete, and Escape to clear.
| Key | Action |
|---|---|
| 0 – 9 | Enter digits |
| + − * / | Arithmetic operators |
| Enter or = | Calculate result |
| Backspace | Delete last digit |
| Escape | Clear all (C) |
| Delete | Clear entry (CE) |
| . | Decimal point |
MS stores the displayed number. MR recalls it. M+ and M− add or subtract the current value from memory. MC clears memory.
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Even a basic calculator should be used correctly. The order of operations (PEMDAS/BODMAS) means multiplication and division happen before addition and subtraction. If you type 2 + 3 × 4 on this calculator, you get 14 — not 20 — because multiplication comes first. If you want to add first, enter it in steps: 2 + 3 = 5, then 5 × 4 = 20. Understanding this prevents the most common calculation mistakes.
This free simple calculator online gives you instant results for everyday arithmetic. Whether you need to add, subtract, multiply, or divide, this basic calculator online works exactly like the calculator on your phone or computer — no download, no sign-up required. It is the fastest calculator online free for quick calculations at work, school, or home.
The simple calculator supports keyboard input so you can type numbers and operators directly for maximum speed. Memory functions (M+, M-, MR, MC) let you store and recall values, making it easy to chain multi-step calculations. As a free calculator, it is always available in your browser on any device.
MS (Memory Store) saves the current display number. MR (Memory Recall) brings it back. M+ adds the displayed value to whatever is stored in memory. M− subtracts from memory. MC clears memory. Practical use: calculate a subtotal, press MS, continue calculating, then press MR to retrieve and add it back.
PEMDAS (or BODMAS in Canada/UK): Parentheses, Exponents, Multiplication/Division (left to right), Addition/Subtraction (left to right). So 2 + 3 × 4 = 14, not 20. This calculator follows the correct order. If you want addition first, calculate it in steps: 2 + 3 = 5, then 5 × 4 = 20.
Yes. Number keys (0–9), operators (+, −, *, /), decimal point, Enter or = for the result, Backspace to delete the last digit, and Escape to clear everything. Keyboard input is typically 2–3× faster than clicking buttons for rapid calculations.
To find 20% of 150: type 150 × 0.20 = 30. To add 13% HST to $200: 200 × 1.13 = 226. To find what % 45 is of 180: 45 ÷ 180 × 100 = 25%. For a quick tip: find 10% (move decimal left), then adjust — 20% tip on $75 = $7.50 × 2 = $15.
The +/− button (sign change or negation) toggles the displayed number between positive and negative. If the display shows 25, pressing +/− changes it to −25. This is useful for entering negative numbers mid-calculation without disrupting an ongoing expression.
C (Clear) wipes the entire calculation — number and any pending operation — and returns to zero. CE (Clear Entry) removes only the last number typed, leaving any pending operation intact. If you're multiplying 45 × and accidentally type 789 instead of 789.50, press CE to clear just that entry and retype it correctly.
A simple calculator handles the four arithmetic operations: + − × ÷. A scientific calculator adds trigonometric functions, logarithms, exponents, roots, factorials, and constants like π and e. For everyday tasks — budgeting, splitting bills, tax calculations, tip math — a simple calculator is all you need. Use our Scientific Calculator for advanced math.
An online calculator is instantly accessible in your browser without switching apps, is easier to use on a larger screen, supports keyboard input for speed, and — with a free account — lets you save and share calculation history. It's ideal for desktop work where your hands are already on a keyboard.