Basic Calculator Online: Add, Subtract, Multiply and Divide
A basic calculator is useful for quick arithmetic while shopping, studying, planning a budget or checking a value. Enter the expression carefully and verify important calculations independently.
Use the basic calculator
- Enter the first number and choose an arithmetic operation.
- Enter the next number, then continue with the expression you need.
- Use the clear control to remove an incorrect entry and start again.
- Review the displayed result and the order of operations for expressions with more than one operator.
- Copy or write down the result if you need it elsewhere.
Operations and order of operations
The calculator works with two numbers and one operation at a time: add, subtract, multiply or divide. It does not read brackets or a long expression. When you calculate in several steps, you decide the order, remembering the usual rule of arithmetic that multiplication and division come before addition and subtraction.
Check results used for money or safety
Rounding, taxes, fees and unit conversions can change practical totals. Confirm financial, engineering, medical or safety-critical calculations with an appropriate source.
One operation at a time
The calculator takes two numbers and one operation, which can be add, subtract, multiply or divide, and shows the result. It does not read a long expression such as 2 + 3 x 4 or use brackets. For a longer calculation do it in steps and use the result of one step as the first number of the next, working in the order you need, for example multiplying first and adding afterwards.
Rounding and division
The result is shown with up to two decimal places, so a long decimal is rounded for display. Dividing by zero is not possible and the tool shows a message. Dividing 10 by 3 shows 3.33, and the true value continues without end, so if you need more digits for a later step, write the numbers down from a source that shows more decimals or work with fractions.
Where a calculator is not enough
For money, tax, measurements or anything with consequences, check the figures again, and keep a note of each step so that you can see where a mistake came in. For repeated calculations, tables or totals of many numbers a spreadsheet is a better tool because every number is visible and can be changed later. The Percentage, Discount and Loan calculators handle common tasks that need more than one step.
Frequently asked questions
Does a basic calculator replace a spreadsheet?
No. It is intended for quick arithmetic, while spreadsheets are better for repeated calculations, tables and audit trails.
Why does 2 + 3 × 4 equal 14?
Multiplication is normally evaluated before addition. Use parentheses if you intend a different order.
Does it replace a spreadsheet?
No. It is for quick arithmetic. A spreadsheet is better for many numbers and for calculations you will repeat.
Why does 10 divided by 3 show 3.33?
The result is rounded to two decimal places for display.
Can I type 2 + 3 x 4 in one go?
No. The tool takes two numbers and one operation at a time, so calculate in steps.
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