standalone calculator tool

 

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Smart Calculator

Fast, free and feature-rich online calculator

M — Memory Active

0

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Calculation History

Your calculations will appear here.

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Scientific Functions

Calculate square roots, powers, trigonometric functions, logarithms, factorials and more.

⌨️

Keyboard Support

Use your computer keyboard for numbers, operators, Enter, Escape, Backspace and more.

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Dark Mode

Switch between light and dark themes for comfortable use in different environments.

Free Online Calculator

This free online calculator makes everyday mathematical calculations quick and convenient. It works directly in your web browser on smartphones, tablets, laptops and desktop computers.

Calculator Features

• Basic addition, subtraction, multiplication and division
• Percentage calculations
• Square and square-root calculations
• Scientific functions
• Trigonometric calculations
• Logarithm and natural logarithm functions
• Factorial calculations
• Memory functions
• Calculation history
• Keyboard shortcuts
• Copy-friendly results
• Responsive mobile design
• Light and dark themes

How to Use the Calculator

Enter numbers using the buttons or your keyboard. Select an arithmetic operator and enter the next number. Press the equals button to calculate the result. Scientific functions are available in the function panel above the main calculator keypad.

© 2026 Smart Calculator. Free to use.

``` Included features Basic arithmetic: + − × ÷ Percentage calculations Parentheses Decimal calculations Scientific functions sin, cos, tan log, ln Square x² Square root √x Reciprocal 1/x Factorial n! π and e constants Positive/negative toggle Memory: MC, MR, M+, M− Calculation history with localStorage Keyboard support Backspace, AC and CE Responsive mobile/tablet/desktop layout Light/dark mode Colorful modern UI No API key No external library required SEO-friendly title, description and content Works as a single .html file Save the code as calculator.html and open it in any modern browser.