Scientific Calculator Online Free

Scientific Calculator

This is an expression calculator rather than a button-based one: you type the whole calculation as a single line and get the answer as you type. That difference matters more than it sounds. A button calculator forces you to commit to an order of operations as you go and gives you no record of what you entered, which is why transcription errors in long calculations are so common. Typing sin(30) + 2^10 / sqrt(16) lets you see the entire expression, check it, and correct one character without starting over. It supports trigonometric functions in degrees or radians, logarithms in base 10 and base e, powers and roots, and the constants pi and e. Standard operator precedence applies, and parentheses override it wherever you need them to.

How this is calculated

The expression is parsed into a syntax tree and evaluated with standard precedence: parentheses first, then exponentiation, then multiplication and division, then addition and subtraction. Operators of equal precedence evaluate left to right, except exponentiation, which is right-associative — so 2^3^2 is 2^9 = 512, not 8^2 = 64.

Worked example on sin(30) + 2^10 / sqrt(16) in degree mode: sin(30) is 0.5, 2^10 is 1024, sqrt(16) is 4, so the division gives 256, and the total is 256.5.

Implicit multiplication is not assumed. Write 2*(3+4) rather than 2(3+4), and 2*pi rather than 2pi — being explicit removes an entire category of ambiguity that causes calculators to disagree with each other.

Degrees or radians — the setting that changes your answer

Trigonometric functions take an angle, and the same number means different angles in each mode. sin(30) is 0.5 in degrees and about −0.988 in radians, because 30 radians is roughly 1,719 degrees.

Geometry, surveying and most everyday problems use degrees. Calculus, physics and anything involving the unit circle use radians, where the argument of a trig function is an arc length rather than a degree count. If a result looks wildly wrong, the mode is the first thing to check — it accounts for more trigonometry errors than any actual mistake in the expression.

Precedence, and why 6/2(1+2) causes arguments

The famous ambiguous expressions circulating online are ambiguous because of implicit multiplication, not because mathematics is unclear. Some conventions treat a coefficient adjacent to parentheses as binding more tightly than division; others treat it as ordinary multiplication with equal precedence.

The resolution is to write what you mean. 6/(2*(1+2)) and (6/2)*(1+2) are both unambiguous and give 1 and 9 respectively. This calculator requires explicit multiplication for exactly that reason — there is no interpretation to guess at.

How to use the scientific calculator

Type the full expression. Write it as one line, with explicit * for multiplication. The result updates as you type.
Set degrees or radians. Only affects trigonometric functions, but it changes their results completely. Degrees for geometry, radians for calculus.
Use parentheses freely. They cost nothing and remove any doubt about precedence. When in doubt, add a pair.

Frequently asked questions

What functions are supported?

sin, cos, tan, asin, acos, atan, log (base 10), ln, sqrt, abs, exp, the operators + − × ÷ ^ %, parentheses, and the constants pi and e.

Why does sin(30) give 0.5 here but −0.988 elsewhere?

Angle units. In degree mode sin(30°) = 0.5; in radian mode sin(30 rad) ≈ −0.988. Switch the angle unit to match your problem.

What is the order of operations here?

Parentheses, then exponents, then multiplication and division left to right, then addition and subtraction left to right. Exponentiation is right-associative, so 2^3^2 evaluates as 2^9 = 512.

Why do I have to write 2*(3+4) instead of 2(3+4)?

Because implicit multiplication is the source of the ambiguity behind expressions like 6/2(1+2), where different conventions give 1 or 9. Requiring an explicit operator means there is nothing to interpret — you get exactly what you wrote.

Does this work offline?

Yes. The expression parser runs entirely in your browser, so nothing you type is sent anywhere and the page keeps working once loaded even without a connection.