Add, subtract, multiply, and divide instantly — with percent and memory keys, just like the calculator on your desk. Free, no sign-up, works offline once loaded.
A simple calculator — also called a basic or four-function calculator — performs addition, subtraction, multiplication, and division, plus percentages and a memory function for running totals. It's the same layout as the calculator in a kitchen drawer or office desk: no trigonometry, no logarithms, just the everyday math most people actually need.
This calculator runs directly in your browser. It follows the order that operations are entered (not algebraic order of operations), and includes the same memory keys — M+, M-, MR, MC — found on physical desktop calculators.
Type the first number, press + or −, type the percentage, then press %. For example, to add 10% to 200: press 2 0 0, then +, then 1 0, then %, then =. The display shows 220 — the original 200 plus 10% of 200 (which is 20).
Used by itself, without a preceding + or −, the percent key just converts a number to its decimal form: 50 % shows 0.5.
| Button | Function |
|---|---|
| M+ | Adds the number on the display to memory |
| M- | Subtracts the number on the display from memory |
| MR | Recalls the stored memory value to the display |
| MC | Clears the memory back to zero |
| AC | All Clear — resets the display and current calculation |
| ← | Backspace — deletes the last digit entered |
| ± | Switches the displayed number between positive and negative |
The memory keys are useful when you need to hold a running total while doing an unrelated calculation in between — for example, keeping a subtotal in memory while checking individual item prices.
No — like most physical desktop and pocket calculators, this one evaluates operations in the order you enter them, left to right. Typing 2 + 3 × 4 gives 20 (2+3=5, then 5×4=20), not 14 as algebraic order of operations would give. If you need PEMDAS-correct evaluation with parentheses, use a scientific calculator instead.
A simple calculator is used for everyday arithmetic: addition, subtraction, multiplication, division, percentages, and running totals. It covers tasks like splitting a bill, checking change, working out a discount, or adding up a shopping list, without needing the trigonometry or logarithm functions found on a scientific calculator.
A basic four-function calculator like this one evaluates operations in the order they are entered, left to right, rather than following algebraic order of operations (PEMDAS). For example, entering 2 + 3 × 4 gives 20 (2+3=5, then 5×4=20), not 14. This matches how physical desktop and pocket calculators work.
M+ adds the number currently on the display to the calculator's memory. M- subtracts the displayed number from memory. MR recalls the stored memory value back onto the display. MC clears the memory to zero. These let you hold a running total while doing other calculations in between.
When percent follows a plus or minus sign, it calculates that percentage of the first number and applies it: entering 200 + 10% gives 220, because it adds 10% of 200 (20) to 200. Used on its own, percent simply converts a number to its decimal form, so 50% becomes 0.5.
Yes. This calculator supports full keyboard input: number keys and the decimal point enter digits, +, -, *, and / perform operations, Enter or = calculates the result, Backspace deletes the last digit, and Escape clears the calculator.