What functions does this calculator support?

The calculator supports basic arithmetic (+, −, ×, ÷), modulo (%), trigonometric functions (sin, cos, tan), logarithms (log base 10 and natural log ln), square root (√), powers (x², xʸ), parentheses, sign negation (±), and the constants π and e.

What is the difference between DEG and RAD mode?

In DEG mode, angles are measured in degrees (360° in a full circle). In RAD mode, angles are measured in radians (2π radians in a full circle). sin(90°) = 1 in DEG mode; sin(π/2) = 1 in RAD mode. Always check the mode before computing trig functions.

How do I enter sin(30)?

Press the sin button (which appends 'sin('), then press 3, 0, ), and finally =. The full expression sin(30) is evaluated with the current angle mode.

What does log mean here: base 10 or natural log?

log is base-10 logarithm (common log). ln is the natural logarithm (base e). This matches the convention on most physical scientific calculators.

How do I calculate x raised to a power?

Use the xʸ button, which appends the ** (power) operator. For example: 2 xʸ 8 = evaluates 2**8 = 256. For a square specifically, use the x² button which appends **2.

Can I type expressions with the keyboard?

Currently the calculator uses the on-screen buttons. Keyboard input is not supported in this version.

How many calculations does the history keep?

The history panel shows the 10 most recent calculations, with expressions and results. It clears when you reload the page.

What happens if I enter an invalid expression?

The calculator displays 'Error' if the expression cannot be evaluated. This can happen from mismatched parentheses, division by zero, or invalid syntax. Press AC to clear and start over.

Is this calculator free to use?

Yes: completely free, no account needed, and everything runs in your browser without any downloads.

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Scientific Calculator

Full-featured calculator with trig, logarithms, and power functions.

Angle:

Calculation history will appear here.

Why a scientific calculator in the browser beats downloading an app

A scientific calculator is one of those tools you need occasionally but do not want to dedicate desktop real-estate to. Opening a browser tab is faster than finding an app, and this calculator covers the functions needed for most engineering, science, and mathematics coursework: the six trig functions in degree and radian mode, both log bases, square roots, arbitrary powers, and the fundamental constants π and e.

The calculation history is particularly useful for multi-step problems. Instead of writing down intermediate results, each evaluation is logged with its expression so you can trace back through your work. If you are comparing scenarios: for example computing sin at multiple angles or comparing compound interest at different rates: the history panel keeps all the values visible at once.

How to use the scientific calculator: step by step

1
Choose degree or radian mode
Use the DEG/RAD toggle at the top of the calculator. Degree mode is standard for most school and engineering problems. Radian mode is used in calculus and higher mathematics.
2
Enter your expression
Click the buttons to build a mathematical expression. The display shows the expression as you build it and the running result updates in real time.
3
Use scientific functions
The top rows contain sin, cos, tan, log (base 10), ln (natural log), square root, and power functions. Function buttons automatically open a parenthesis: close it after entering the argument.
4
Press = to evaluate
Press the equals button to evaluate the full expression. The result replaces the display and is added to your calculation history on the right.
5
Continue from the result
After pressing =, you can press an operator (+, −, ×, ÷) to continue the calculation from the current result, or start a new expression by pressing a digit or function.

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Frequently Asked Questions

What functions does this calculator support?: The calculator supports basic arithmetic (+, −, ×, ÷), modulo (%), trigonometric functions (sin, cos, tan), logarithms (log base 10 and natural log ln), square root (√), powers (x², xʸ), parentheses, sign negation (±), and the constants π and e.
What is the difference between DEG and RAD mode?: In DEG mode, angles are measured in degrees (360° in a full circle). In RAD mode, angles are measured in radians (2π radians in a full circle). sin(90°) = 1 in DEG mode; sin(π/2) = 1 in RAD mode. Always check the mode before computing trig functions.
How do I enter sin(30)?: Press the sin button (which appends 'sin('), then press 3, 0, ), and finally =. The full expression sin(30) is evaluated with the current angle mode.
What does log mean here: base 10 or natural log?: log is base-10 logarithm (common log). ln is the natural logarithm (base e). This matches the convention on most physical scientific calculators.
How do I calculate x raised to a power?: Use the xʸ button, which appends the ** (power) operator. For example: 2 xʸ 8 = evaluates 2**8 = 256. For a square specifically, use the x² button which appends **2.
Can I type expressions with the keyboard?: Currently the calculator uses the on-screen buttons. Keyboard input is not supported in this version.
How many calculations does the history keep?: The history panel shows the 10 most recent calculations, with expressions and results. It clears when you reload the page.
What happens if I enter an invalid expression?: The calculator displays 'Error' if the expression cannot be evaluated. This can happen from mismatched parentheses, division by zero, or invalid syntax. Press AC to clear and start over.
Is this calculator free to use?: Yes: completely free, no account needed, and everything runs in your browser without any downloads.

AlteredIdea vs alternatives

vs other online tools: Everything runs in your browser: private, instant, no account needed.

vs desktop apps: No install required. Works on any device.

vs paid tools: Completely free, unlimited use.

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