🧮 Scientific Calculator
Use this free scientific calculator for trigonometry, logarithms, square roots, powers, factorials, constants, and expression history directly in your browser.
📋 When to Use the Scientific Calculator
Students solve trigonometry, logarithms, and power equations for math and physics homework — the calculator handles sin/cos/tan (in degrees), log base-10, natural log (ln), square roots, exponents, and factorials. Engineers and developers use it as a quick scratchpad for numeric computations without launching a desktop app. The Ans variable lets you chain operations like a physical calculator: compute 5*3, then Ans+10 to get 25. Since all evaluation runs in your browser via JavaScript's eval() with preprocessed expressions, your inputs never touch a server.
⚙️ How the Scientific Calculator Works
Your expression goes through a string-replacement pipeline before evaluation: π → Math.PI, e → Math.E, sin( → Math.sin(Math.PI/180* (converting degrees to radians), cos( and tan( similarly, log( → Math.log10(, ln( → Math.log(, √( → Math.sqrt(, ^ → **, and !n is computed via a loop. The transformed string is evaluated by JavaScript's eval() — this gives you access to the full power of the JS math engine. The result is stored in Ans for chaining, and all past calculations appear in a scrollable history panel (last 10 entries). Nothing is sent to any server — all computation is local.
How to Use the Scientific Calculator
1. Enter an expression. Type a mathematical expression like sin(45)*2 + sqrt(16) into the input field. You can also use the on-screen button pad for common functions, digits, and operators.
2. Press "=" or Enter. The calculator evaluates your expression and displays the result. Supported operations include trig functions (sin, cos, tan), logarithms (log, ln), powers (^), square root (sqrt), factorial (!), and constants (π, e).
3. Use Ans for chaining. The special Ans variable stores your last result, so you can chain calculations: compute 5*3, then Ans+10 to get 25. This mimics the behavior of physical scientific calculators.
4. Review your history. All calculations are saved in the history panel below the display. Scroll through to review, reuse, or verify previous results.
Frequently Asked Questions
What functions does the calculator support?
Trigonometric: sin, cos, tan (in degrees). Logarithmic: log (base-10), ln (natural log). Powers and roots: ^ (exponentiation), sqrt (square root). Other: ! (factorial), π and e constants. Standard operators: +, -, *, /, and parentheses for grouping.
Is trig input in degrees or radians?
All trigonometric functions (sin, cos, tan) expect input in degrees. For example, sin(90) returns 1. If you need radians, convert manually by multiplying by π/180.
How is the order of operations handled?
The calculator follows standard mathematical precedence (PEMDAS): parentheses first, then exponents/factorials, then multiplication/division, then addition/subtraction. Use parentheses to override default precedence.
Can I use this offline?
Yes. The calculator runs entirely in your browser with no server dependency. Once the page is loaded, all calculations happen locally. You can even add it to your device's home screen as a PWA for quick access.