Free online calculator

A clean calculator for the sums you do every day: shopping totals, bills, homework and quick checks. It opens instantly, works on any phone or computer and needs no account.

Open the calculator

What it does

The calculator handles addition, subtraction, multiplication and division with whole numbers and decimals. It also has an AC key to clear everything, a backspace key to remove the last digit, and a percent key for quick percentage steps. The expression you are building shows above the result, so you can see what you typed and spot a mistake before relying on the answer.

How to use it

Tap the number keys to enter your first value.
Choose an operator: ÷, ×, − or +.
Enter the second value.
Press = to see the result.
Use ⌫ to fix a wrong digit, or AC to start again.

Example

You buy three items at 4.50, 12.25 and 7.80 and want the total. Enter 4.5 + 12.25 + 7.8 and press =. The answer is 24.55. To split that bill between three friends, continue with ÷ 3 and you get about 8.18 each.

Tips for accurate results

Check the expression line before pressing =. A single wrong key changes the whole answer.
Calculators follow the usual order of operations in many designs, so for long mixed sums, work in small steps if you want to be sure.
For percentages and discounts, the dedicated percentage calculator is clearer than the percent key.
For prices with a cost and a selling price, use the profit and loss calculator.

Privacy

Everything you type is calculated in your browser. The numbers are not sent anywhere and are not saved.

Where a calculator saves you time

Quick sums are not only for maths class. People use a calculator to total a shopping basket, check a restaurant bill, plan monthly spending, measure materials for a home project and compare prices in a shop. For example, a 500 g pack costs 2.50 and a 750 g pack costs 3.30. Divide each price by its weight and you see the bigger pack costs about 0.0044 per gram against 0.005 for the smaller one, so it is the better value.

Frequently asked questions

Is the calculator free?

Yes. There is no sign-up, no limit and no hidden fee.

Does it work on my phone?

Yes. The keys are sized for touch screens and the page adapts to small displays.

Why does a long decimal answer look rounded?

Computers store decimals approximately, so very long results are rounded for readability. For money, rounding to two decimals is normal.

Can I convert units here?

Use the unit and currency converter for length, weight, temperature and currency.