Scientific Calculator

Powerful math in your browser

Type a full expression like sin(45) + sqrt(2)^3 and press Enter to evaluate it instantly. The calculator respects standard order of operations and right-associative exponents, so results match what you would expect on a physical scientific calculator.

Switch between degrees and radians for trigonometric functions, and use the constants π and e directly in your expressions.

Supported functions

• Trigonometry: sin, cos, tan and inverses (asin, acos, atan)
• Logarithms: log (base 10) and ln (natural)
• Powers, square roots, exponentials and absolute value
• Factorials (n!) and the constants π and e
• Parentheses, percentages and reciprocal (x⁻¹)

Key features at a glance

• Evaluates full expressions with parentheses and operator precedence
• Trigonometry: sin, cos, tan and their inverses, in degrees or radians
• Logarithms (log base 10 and natural ln), powers, roots, and exponentials
• Factorials, absolute value, reciprocal, and the constants π and e
• Type an expression and press Enter to evaluate instantly
• Runs entirely in your browser, even offline

How expression evaluation and precedence work

Unlike a basic calculator that processes keys one at a time, a scientific calculator parses an entire expression and applies the mathematical order of operations. Parentheses are resolved first, then exponents, then multiplication and division, and finally addition and subtraction. This means an expression like 2 + 3 × 4 correctly returns 14, and you can build complex formulas in a single line exactly as you would write them on paper.

Exponents are right-associative, so 2^3^2 evaluates as 2^(3^2) = 512, matching standard mathematical convention. Functions like sin and sqrt take their argument in parentheses and combine naturally with the rest of the expression. Understanding this lets you trust the calculator with multi-step formulas rather than breaking them into pieces and risking transcription errors between steps.

Degrees versus radians

Trigonometric functions can interpret their input in two different units, and choosing the wrong one is the single most common source of confusion. Degrees divide a full circle into 360 parts and are familiar from geometry and everyday angles. Radians measure angles by arc length, with a full circle equal to 2π, and are the natural unit in calculus and most higher mathematics.

This calculator lets you switch between the two modes so sin(90) gives 1 in degree mode and sin(π/2) gives 1 in radian mode. Always check which mode you are in before computing a trigonometric value, because the same number means a completely different angle depending on the unit — a frequent cause of wrong answers in homework and engineering calculations.

Tips for using the scientific calculator

• Confirm whether you are in degree or radian mode before using trig functions
• Use parentheses generously to make precedence explicit and avoid ambiguity
• Type π and e directly in expressions instead of approximating them
• Remember exponents are right-associative, so stack them carefully
• Build the whole expression in one line and evaluate once to avoid rounding between steps

Why choose our scientific calculator?

Our calculator is completely free with no signup, no limits, and no subscription. It runs entirely in your browser, so it loads instantly, works offline, and keeps every calculation on your device — nothing is sent to a server.

It is one of more than 200 free tools on ToopTools, and you can pin it to your My Workspace, a personalized workspace where you keep the tools you use most in a single dashboard. Beside the standard calculator, statistics, and converter tools, it gives students and professionals a full-featured calculator that is always one click away.

Common use cases

Students use the scientific calculator for algebra, trigonometry, physics, and chemistry homework, where functions, powers, and constants appear constantly. Being able to type a whole expression and evaluate it at once reduces mistakes compared with chaining steps on a basic calculator.

Engineers, scientists, and analysts use it for quick technical calculations — exponential growth, logarithmic scales, angle conversions, and combinatorics with factorials. Because it respects standard precedence and supports both angle modes, the results match what a physical scientific calculator would give, without needing to carry one.

Is the scientific calculator free?

Yes. It is completely free with no account, no sign-up, and no usage limits. Evaluate as many expressions as you like at no cost.

How do I switch between degrees and radians?

Use the degree/radian toggle before evaluating a trigonometric function. In degree mode angles are measured out of 360; in radian mode a full circle is 2π. The same input gives different results in each mode, so set it first.

Does it follow the correct order of operations?

Yes. It parses the whole expression and applies precedence: parentheses, then exponents, then multiplication and division, then addition and subtraction, so formulas evaluate exactly as written mathematically.

Can I use π and e in expressions?

Yes. Both constants are built in, so you can type them directly within an expression, for example sin(π/2) or e^2, and the calculator uses their full precision rather than a rounded approximation.

How are exponents handled?

Exponents use the caret (^) and are right-associative, matching mathematical convention, so 2^3^2 is treated as 2^(3^2). Use parentheses if you intend a different grouping.

What is a factorial and how do I compute it?

A factorial, written n!, is the product of all positive integers up to n, so 5! = 5 × 4 × 3 × 2 × 1 = 120. It is widely used in combinatorics and probability. Enter the number followed by the factorial function to compute it.

What is the difference between log and ln?

log is the base-10 logarithm and ln is the natural logarithm with base e (about 2.718). Both are available, so use log for orders of magnitude and ln for growth and calculus problems.

Are my calculations kept private?

Yes. Everything is computed locally in your browser and nothing is uploaded, so your expressions and results stay entirely on your device, and the tool works offline.

How do I calculate sine, cosine, and tangent?

Enter the angle and press the sin, cos, or tan button. First make sure the mode matches your angle — use degrees for everyday angles like 90, or radians for values involving π — then the calculator returns the trigonometric result instantly.

Does the scientific calculator work offline?

Yes. All calculations run entirely in your browser, so once the page has loaded the tool works without an internet connection, and nothing you type is uploaded. You can compute complex expressions privately on your own device.