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Standard Calculator

Basic arithmetic calculator with memory functions

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Keyboard supported

About the Standard Calculator with Memory

The Standard Calculator with Memory is a straightforward on-screen calculator for the arithmetic you actually do all day — adding up a grocery receipt, splitting a bill, checking a multiplication before you commit it to a spreadsheet, or working out a percentage change. It exists because opening a full spreadsheet app or hunting for your phone just to add two numbers is overkill, and a lot of built-in OS calculators are buried behind several clicks or app-switches. This one loads in a browser tab and is ready to use immediately, with no installation and no account required.

It covers the four core operations — addition, subtraction, multiplication and division — plus four memory keys: M+ adds the displayed number to memory, M- subtracts it, MR brings the stored total back, and MC resets it to zero. Instead of writing intermediate results on a sticky note, you can work out each line item, add it to memory, and recall the grand total at the end. A small "M:" line under the display shows what memory holds, and the clock button opens a history of your last 20 results, each with a Use button to put it back on the display.

There is no percent, square-root or sign-change key, and operations are applied strictly left to right as you enter them, the way a pocket calculator works: 2 + 3 × 4 = gives 20, because 2 + 3 is worked out the moment you press ×. If you need the multiplication first, enter 3 × 4 = and then + 2 =. Digits, the four operators, Enter, Backspace and Escape all work from the keyboard, which is the fastest way to add up a column of figures.

How to use the Standard Calculator with Memory

Perform arithmetic and use the memory functions to track a running value across multiple calculations.

  1. 1

    Enter the first number

    Click the number buttons (or type on your keyboard) to enter your first value on the display.

  2. 2

    Choose an operation

    Select addition, subtraction, multiplication, or division to set up the calculation.

  3. 3

    Enter the second number and get a result

    Type the second value and press equals to see the calculated result on the display.

  4. 4

    Add the result to memory

    Press M+ to add the number on the display to memory, or M- to subtract it. There is no separate store key; memory starts at 0, so the first M+ stores the value. An "M:" line under the display shows what is held.

  5. 5

    Clear the entry before the next number

    Press CE before typing the next value. M+ and M- leave the display as it is, so without CE your next digits are appended to the old number.

  6. 6

    Recall or clear memory

    Press MR to put the stored total back on the display and keep calculating with it, or MC to reset memory to zero. Clear (or Escape) resets the calculation but not the memory.

Worked examples

Totalling a receipt with memory

Input
3 × 4.25 = then M+ 2 × 6.5 = then M+ 7.99 then M+ MR
Result
12.75 and 13 appear after each =, and the line under the display reads M: 33.74 at the end. MR puts 33.74 on the display.

Memory starts at 0, so the first M+ effectively stores 12.75.

Chaining operations left to right

Input
100 − 15 × 0.8 =
Result
68. The display shows 85 as soon as you press ×, then 68 after =.

Each operator finishes the step before it, like a pocket calculator. It does not do multiplication first, which would give 88.

Decimal surprises

Input
0.1 + 0.2 = 1 ÷ 3 = 5 ÷ 0 =
Result
0.30000000000000004 0.3333333333333333 Error

The calculator shows the exact binary floating-point result rather than rounding it, so some decimals come out with a long tail.

Tips and common mistakes

  • Operations run left to right as you press them: 2 + 3 × 4 = gives 20, not 14. When you need the multiplication first, do it on its own (3 × 4 =) and then add 2.
  • M+ and M- do not start a new number. If you type a value and press M+, press CE before typing the next value or the digits are added to the end of the old one. After = this is not needed, because the next digit replaces the result.
  • Clear (and Escape) reset the current calculation but leave memory alone. Use MC to reset memory.
  • There is no % key. For 15% of a price multiply by 0.15; to add 15%, multiply by 1.15.
  • The clock button opens the history of your last 20 calculations. Use puts any past result back on the display to keep working with it. History and memory are cleared when you reload.

Frequently Asked Questions

What operations does the standard calculator support?

Addition, subtraction, multiplication and division, a decimal point, four memory keys (MC, MR, M+, M-), Clear, CE (clear entry), a backspace key, a copy button for the display, and a history panel with your last 20 results. There is no percent, square-root or sign-change key.

Can I use the keyboard to enter numbers?

Yes. Digits, the decimal point and + - * / work from the keyboard. Enter or = evaluates, Backspace deletes the last digit, and Escape clears everything except memory.

How do I work out a percentage without a % key?

Multiply by the percentage as a decimal. 15% of 80 is 80 × 0.15 = 12. To add 15% to 80, multiply by 1.15 (result 92); to take 15% off, multiply by 0.85 (result 68).

What is the difference between Clear and CE?

CE (clear entry) wipes only the number you are typing, so a pending operation like "12 +" is kept. Clear wipes the whole calculation. Neither one touches memory.

Why does 0.1 + 0.2 show 0.30000000000000004?

Numbers are stored in binary floating point, which cannot represent 0.1 or 0.2 exactly, and this calculator displays the full result without rounding. For money, read the result to two decimal places: 0.30.