The Ultimate Free Online Calculator (Basic & Scientific)

Welcome to the most versatile free online calculator on the web. Whether you need to split a dinner bill, complete your algebra homework, or visualize complex functions for an engineering project, this tool adapts to your needs. We have combined the simplicity of a standard basic calculator with the power of a scientific graphing engine into one secure, single-file application.

1. The Basic Calculator Mode

Sometimes, less is more. When you open this tool, you are greeted with the "Basic" tab. This interface mimics the classic handheld calculators found in offices and schools worldwide.

• Large, Easy Buttons: Designed for touchscreens and quick mouse clicks.
• Essential Functions: Addition, Subtraction, Multiplication, Division, and Percentage.
• Clean Layout: No confusing trigonometry or logarithm buttons cluttering the screen when you just need to do simple arithmetic.
• Keyboard Support: Just type numbers on your keyboard to calculate instantly.

2. The Scientific Calculator Mode

Need more power? Click the "Scientific" tab to unlock a full suite of mathematical tools powered by the robust Math.js engine.

• Trigonometry: Calculate Sine, Cosine, Tangent (and their inverses) in both Degrees and Radians.
• Algebra: Handle exponents (xʸ), square roots (√), and parentheses for complex order of operations.
• Logarithms: Natural Log (ln) and Log base 10 support.
• Constants: Quick access to Pi (π) and Euler's number (e).

3. The Graphing Calculator Mode

Visualizing mathematics is crucial for understanding. Our built-in graphing tool allows you to plot functions instantly.

• Instant Plotting: Type x^2 or sin(x) * x and hit plot.
• High Resolution: Uses HTML5 Canvas and Chart.js for crisp lines.
• Interactive: See the behavior of functions across the X and Y axes.

Why Use This Online Tool?

Privacy First: Most online calculators send your data to a server. This calculator runs 100% on your device (Client-Side). You can even save this page and use it offline.

Responsive Design: Whether you are on a mobile phone, an iPad, or a desktop computer, the layout adjusts to fit your screen perfectly.

Accuracy: We utilize floating-point arithmetic libraries to ensure high precision for scientific calculations, avoiding common JavaScript math errors.

Common Uses

For Students: Check your homework answers for Calculus, Algebra, and Geometry.

For Business: Quickly calculate profit margins, tax percentages, and totals using the Basic mode.

For Everyday Life: Convert units, calculate tips, or sum up grocery bills.

Troubleshooting & FAQ

How do I type exponents? Use the ^ symbol. For example, 2 to the power of 3 is 2^3.

Why is my Sin() result weird? Check the DEG/RAD toggle. In Scientific mode, ensure you are in the correct angle mode for your problem.