Math Expression Calculator
Evaluate complex math expressions online with variables, 20+ functions, and real-time calculations. Perfect for algebra, trigonometry, and scientific computing.
What is a math expression calculator?
A math expression calculator is a tool that evaluates mathematical expressions containing numbers, variables, operators, and functions. It processes complex formulas and returns results instantly, supporting operations from basic arithmetic to advanced calculus functions.
How do I evaluate a math expression with variables?
Enter your expression in the calculator input field, then assign values to variables (x, y, z, a, b, n) in the Variables section. The calculator automatically substitutes these values and evaluates the expression in real-time.
What mathematical functions are supported?
The calculator supports 20+ functions including trigonometric (sin, cos, tan), logarithmic (log, ln, log2), exponential, square root (sqrt), cube root (cbrt), absolute value (abs), rounding functions (ceil, floor, round, trunc), and comparison functions (max, min, sign).
Can I switch between degrees and radians for trigonometry?
Yes, use the Angle Mode dropdown to switch between Degrees (DEG) and Radians (RAD). This setting affects all trigonometric functions like sin, cos, and tan, allowing you to work in your preferred unit system.
Does the calculator save my calculation history?
Yes, pressing Enter saves your current expression and result to the History list (up to 10 entries). You can click any previous calculation to reuse it, making it easy to track and reference past computations.
What operators can I use in expressions?
You can use basic arithmetic operators (+, -, *, /), exponentiation (^), and parentheses for grouping. The calculator follows standard order of operations (PEMDAS) to ensure accurate evaluation of complex expressions.
Is this calculator suitable for algebra and calculus?
Absolutely. With variable support and advanced functions like logarithms, exponentials, and trigonometry, it's ideal for algebra, calculus, physics, engineering, and other scientific computations requiring symbolic mathematics.
Can I use constants like pi and e in my formulas?
Yes, the calculator includes built-in constants: pi (π ≈ 3.14159) and e (Euler's number ≈ 2.71828). Simply type "pi" or "e" in your expression, and they'll be automatically recognized and used in calculations.
How accurate are the calculations?
The calculator uses JavaScript's native floating-point arithmetic, providing precision up to 15-17 significant digits. This level of accuracy is sufficient for most scientific, engineering, and educational applications.
Do I need to install anything to use this calculator?
No installation required. This is a web-based calculator that runs directly in your browser. Simply open the page and start calculating. It works on all modern browsers across desktop, tablet, and mobile devices.
How to Use Math Expression Calculator
Evaluate complex math expressions with variables and 20+ built-in functions in real time. All calculations run locally in your browser, so nothing you type is ever uploaded.
- Type a formula into the Expression field, e.g. 2^10 + sin(pi/4) * sqrt(2) — the result updates as you type.
- Assign values to the variables x, y, z, a, b and n in their input boxes, then reference them inside your expression.
- Switch Angle Mode between Degrees (DEG) and Radians (RAD) so trig functions like sin and cos interpret angles the way you expect.
- Combine functions such as sqrt, sin, cos, log and the ^ power operator to build algebra and trigonometry calculations.
If a trig result looks wrong, check the Angle Mode first — sin(90) means something completely different in DEG and RAD.
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