Math tool
Calculator
Free online calculator for arithmetic, percentages, decimals and grouped expressions.
Result
Your result will appear here.
Privacy note: most tools process input locally in your browser.
About the Calculator
Supports parentheses, decimals, common operators and percent values. Results are calculated locally.
How to use this tool
Enter an expression, check parentheses and operators, then select Calculate. Use parentheses to control calculation order.
Example
Example: (12 + 8) * 3 returns 60.
Tips for better results
Use parentheses for grouped calculations; enter decimals with a dot; check the expression before relying on the result.
Frequently asked questions
How do I calculate percentages?
Enter a percentage expression such as 15% * 240.
Does the calculator upload my expression?
No, calculation runs in your browser.