Basic Calculator

How to Use the Basic Calculator

For “How to Use the Basic Calculator,” the Basic Calculator organizes the relevant inputs, applies the documented method, and shows a result that can be compared across scenarios. The points below identify the specific considerations and assumptions users should review before relying on the estimate.

1. Enter the first number with the keypad or number keys.
2. Select an operation: add, subtract, multiply, or divide.
3. Enter the next number and press = or Enter.
4. Select the result to copy it, or use Ans in the next calculation.

Longer expressions follow the standard order of operations: multiplication and division are evaluated before addition and subtraction. For powers, roots, logarithms, trigonometry, and parentheses, use the Scientific Calculator.

Basic Calculator Examples

The percent key divides the preceding value by 100. For example, enter 25 % × 80 = to find 25% of 80. For percentage increase, decrease, or change calculations, convert the percentage to a decimal and apply it to the original value.

Calculator Key Guide

AC

Clears the current calculation and display.

Back

Deletes the last number or operator entered.

±

Changes the current value between positive and negative.

%

Converts the value immediately before it to a percentage.

M+ / M−

Adds the displayed value to memory or subtracts it from memory.

MR / MC

Recalls the stored value; press again to clear memory.

Ans

Reuses the result of the most recently completed calculation.

Keyboard shortcuts

Use number keys, +, -, *, and / for arithmetic. Press Enter or = for the result, Backspace to delete one entry, and Escape or Delete to clear the calculator.

Results, Rounding, and Accuracy

Results are calculated in your browser and shown with up to 12 significant digits. Very large or very small answers may appear in scientific notation. For financial, legal, engineering, or other high-stakes decisions, verify the result with the appropriate specialist or purpose-built calculator.

Frequently asked questions

What operations does this basic calculator support?

It supports addition, subtraction, multiplication, division, percentages, decimals, negative numbers, memory, answer recall, and multi-step arithmetic expressions. For a useful Basic Calculator result, enter realistic values, compare relevant scenarios, check the calculation details, and review the definitions, assumptions, and limitations before using the estimate for an important decision.

Can I use my keyboard?

Yes. Number keys, common arithmetic operators, Enter, Backspace, Escape, and Delete are supported when keyboard input is enabled. For a useful Basic Calculator result, enter realistic values, compare relevant scenarios, check the calculation details, and review the definitions, assumptions, and limitations before using the estimate for an important decision.

How does the percent key work?

The percent key converts the value before it to its decimal equivalent. For example, 25% becomes 0.25. For a useful Basic Calculator result, enter realistic values, compare relevant scenarios, check the calculation details, and review the definitions, assumptions, and limitations before using the estimate for an important decision.

Does the calculator save my history?

The page shows up to six recent completed calculations during the current visit. The compact embed hides history by default, and the calculator does not require an account. Review the Basic Calculator assumptions before relying on this result for decisions.

Does this calculator use the order of operations?

Yes. Multiplication and division are evaluated before addition and subtraction in longer expressions. For a useful Basic Calculator result, enter realistic values, compare relevant scenarios, check the calculation details, and review the definitions, assumptions, and limitations before using the estimate for an important decision.