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Scientific Calculator
Evaluate a maths expression with functions and constants — trig, square roots, logs, pi and e — instantly in your browser. Type the expression and read the result.
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Quick Answer
Type a maths expression and the tool evaluates it, supporting the usual operators, parentheses, the constants pi and e, and functions like sin, cos, tan, sqrt, log and ln. Two things to know: trigonometric functions work in radians (use deg to convert, so sin(30*deg) is 0.5), and log is base 10 while ln is the natural log. It runs entirely in your browser; nothing is uploaded.
What the Scientific Calculator Does
This tool works out the value of a maths expression you type, the way a scientific calculator does. It handles arithmetic, powers and parentheses, and the common scientific functions and constants, returning a single numeric result.
It is the quick way to compute something more involved than a basic sum — a trig value, a square root, a logarithm, or an expression mixing several of these — without reaching for a physical calculator.
How It Works
The tool reads your expression, recognises the constants pi and e and the functions you use, and evaluates it following the normal order of operations, with parentheses grouping as you would expect. The result is rounded to about eight decimal places for a clean figure.
A couple of conventions matter. The trigonometric functions take angles in radians, so to work in degrees you multiply by deg — for example sin(30*deg). The function log is the base-10 logarithm, while ln is the natural logarithm, and the caret is used for powers.
Methodology
- Read the expression. Take the maths expression you type.
- Resolve constants and functions. Recognise pi and e and functions like sin, sqrt, log and ln.
- Evaluate in order. Compute following the standard order of operations and parentheses.
- Show the result. Return the value, rounded to about eight decimal places.
What it supports
operators: + − × ÷ and ^ for powers · parentheses ( )
constants: pi, e · functions: sin, cos, tan, sqrt, log (base 10), ln, abs
trig is in radians — multiply by deg for degreesWorked example
2*pi*sqrt(2) → 8.88576588 · sin(30*deg) → 0.5Trigonometric functions work in radians; use deg to enter degrees. log is base 10 and ln is the natural log. Results are rounded to about eight decimal places.
Assumptions
- Trigonometric functions take radians; multiply an angle by deg to use degrees.
- The function log is base 10, while ln is the natural logarithm; the caret raises to a power.
- Results are rounded to about eight decimal places, and the expression must use only the supported operators, functions and constants.
Standards & references
- Order of operations — The expression is evaluated with the usual precedence — powers, then multiplication and division, then addition and subtraction — with parentheses overriding the order as expected.
- Radians for trigonometry — Like most programming and scientific tools, the trig functions use radians. The deg helper multiplies a degree value into radians, so sin(30*deg) gives 0.5.
- Logarithm bases — The function log is the base-10 (common) logarithm; ln is the natural logarithm to base e. Using the right one matters, as they differ by a constant factor.
Accuracy & Limitations
For supported expressions the result is computed correctly and to good precision, rounded to about eight decimal places for a clean figure. The usual order of operations and parentheses apply, so well-formed expressions evaluate as expected.
Trigonometry is in radians. A common mistake is entering degrees directly; sin(30) is not 0.5 because 30 is read as radians. Multiply by deg for degrees, as in sin(30*deg), to get the expected value.
The rounding to eight decimals means very long decimals are shortened, and extremely large or tiny numbers are subject to the usual floating-point limits of a computer, so results at those extremes can lose a little precision.
It accepts only the supported operators, constants and functions. An expression with an unsupported symbol or function is rejected as invalid, rather than guessed at, so check the spelling and that you are using listed functions.
Real-World Use Cases
Evaluating an expression
Compute a multi-part maths expression at once.
Trig and roots
Work out sines, cosines, square roots and more.
Logarithms
Calculate base-10 or natural logs.
Quick scientific sums
Do a calculation more involved than a basic one.
When to use it — and when not to
Good for
- Evaluating a maths expression
- Trig, roots, logs and constants
- Using pi and e in a calculation
- Quick scientific computations
Not the best choice for
- Degrees without the deg helper
- Symbolic algebra or equation solving
- Matrices, calculus or statistics
- Arbitrary-precision or exact fractions
For degrees, multiply angles by deg. For solving equations, calculus or matrices, a computer-algebra tool is needed. For exact fractions or very high precision, a specialised calculator is better. This evaluates numeric expressions.
Frequently Asked Questions
Why is sin(30) not 0.5?
Because the trig functions use radians, and 30 is read as 30 radians, not degrees. For 30 degrees, multiply by deg — sin(30*deg) — which converts it to radians and gives 0.5.
Is log base 10 or natural?
The function log is base 10, the common logarithm. For the natural logarithm to base e, use ln. They differ by a constant factor, so picking the right one matters for the result.
How do I raise a number to a power?
Use the caret. For example, two to the power of ten is 2^10, which is 1024. The caret follows the usual order of operations, so use parentheses if you need to group.
What functions and constants are supported?
The operators and powers, parentheses, the constants pi and e, and the functions sin, cos, tan, sqrt, log (base 10), ln and abs, plus deg to convert degrees to radians.
How precise is the result?
It is rounded to about eight decimal places for a clean figure. The underlying computation uses standard floating-point arithmetic, so very large or tiny numbers carry the usual small precision limits.
Why does it say my expression is invalid?
Because it contains a symbol or function the tool does not support, or a typo. It only accepts the listed operators, constants and functions, and rejects anything else rather than guessing. Check the spelling and the syntax.
Can it solve equations or do algebra?
No. It evaluates numeric expressions, not symbolic algebra. To solve for a variable or simplify an expression, a computer-algebra system is the right tool.
How do I enter pi and e?
Type pi for the ratio of a circle's circumference to its diameter, and e for Euler's number. The tool substitutes their values, so an expression like 2*pi works as expected.
Does it follow the order of operations?
Yes. It uses the standard precedence — powers first, then multiplication and division, then addition and subtraction — and parentheses override the order, so well-formed expressions evaluate correctly.
Can it work in fractions or give an exact answer?
No, it returns a decimal value rounded to about eight places. For exact fractions or arbitrary precision, a specialised calculator that keeps symbolic or rational results is needed.
Is my expression uploaded?
No. The calculation runs entirely in your browser. Nothing is sent to a server.
How do I take a square root or cube root?
Use sqrt for a square root, as in sqrt(2). For a cube root, raise to the power of one third — for example 27^(1/3) — which gives 3.
References
Evaluates a typed expression with common functions and constants; honest that trigonometric functions work in radians, log is base 10, and results are rounded to eight decimals.
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