Basic Calculator

How to use the basic calculator

Enter numbers using the calculator keypad, choose an operation, then press equals to see the result. The basic calculator supports addition, subtraction, multiplication, division, decimals, percentages, sign changes, clear, and delete.

Use it for quick everyday calculations such as checking a bill, adding expenses, splitting a cost, converting a percent to a decimal, or multiplying quantities for shopping, cooking, schoolwork, and simple business math.

Basic calculator operations

The four main arithmetic operations are addition, subtraction, multiplication, and division. Addition combines values, subtraction finds the difference, multiplication scales a value, and division splits a value into equal parts.

This online arithmetic calculator also includes a percent button for quick percentage calculations and a plus/minus button for switching between positive and negative numbers.

• Addition calculator: add two or more numbers to get a total.
• Subtraction calculator: subtract one number from another to find the difference.
• Multiplication calculator: multiply numbers for totals, rates, and repeated groups.
• Division calculator: divide numbers for shares, unit rates, and averages.

Examples of everyday calculations

For shopping, you can add item prices such as 12.50 + 8.75 + 15.20 to get a total of 36.45. For splitting a bill, divide the total by the number of people, such as 124 / 4 = 31.

For scaling a recipe, multiply the original amount by the number of batches. If one recipe uses 2.5 cups of flour and you need three batches, 2.5 x 3 = 7.5 cups.

How to calculate percentages

To find a percentage of a number, multiply the number by the percentage as a decimal. For example, 20 percent of 150 is 150 x 0.20 = 30.

The percent button converts the displayed number into its decimal form. Enter 20 and press percent to get 0.2, then multiply by the number you want to evaluate.

Basic calculator tips for accurate results

Clear the calculator before starting a new problem, especially when checking money, measurements, or homework. Use the delete button if only the last digit is wrong.

Estimate the answer before or after calculating. If 48 x 23 gives a result near 1,100, it is reasonable; if it gives 11,040, there was probably an entry mistake.

• Use decimals carefully when calculating money.
• Use negative numbers for losses, temperature changes, or account adjustments.
• Break longer calculations into smaller steps.
• Recheck division by zero or very large results if the display shows Error.

Basic calculator FAQ

A basic calculator is best for simple arithmetic. Use a scientific calculator for trigonometry, exponents, roots, logarithms, and advanced formulas.

For multi-step math, remember that simple calculator input may evaluate as you enter operations. If order of operations matters, calculate grouped parts separately or use a scientific calculator.