Evaluate expressions with correct operator precedence, parentheses, trigonometric and inverse trig functions in degrees or radians, natural and base-10 logarithms, powers, square roots, factorials, percentages, π, e and the previous answer. A full scientific calculator with trig, logs, powers and roots.
What does this tool do?
A full scientific calculator in the browser: trigonometric, logarithmic, exponential and power functions plus parentheses, memory keys and degree/radian modes — with a history of your calculations. No app install, works on phones.
The Scientific Calculator also serves as a learning aid: watching results change as you drag inputs builds intuition for how the underlying formula behaves — which input moves the answer most, where the diminishing returns start, and what “good” looks like in real numbers rather than abstractions.
The controls are straightforward: “sin” runs the tool; “cos” runs the tool; “tan” runs the tool. Results update live as you work — there is no waiting and nothing to submit.
How do I use this tool?
Enter your figures below — every result updates the instant you type, so comparing scenarios is just a matter of changing a number and watching the answer move.
- Provide the input the tool asks for.
- Click “cos” to run the tool and see the result.
How does it work?
Expressions are parsed with proper operator precedence (BODMAS/PEMDAS): parentheses first, then powers, then multiplication/division, then addition/subtraction. Trig functions respect the DEG/RAD mode toggle; the history tape lets you reuse previous results.
The formula used is the standard one taught and published for this calculation — the tool does not invent methods. Where conventions differ (rounding, day-count, tax treatment), the page follows the common Pakistani practice and says so, so the result matches what local institutions expect.
Use cases in Pakistan
BISE and university students use it for physics and maths numericals where phone calculators fall short; engineering students check complex expressions; and anyone can verify a calculation without installing an app. The history tape is gold for multi-step problems.
Families use it for household budgeting and school-fee planning; small businesses for pricing and payroll math; students for everything from BISE numericals to CSS preparation. Wherever the same calculation is repeated monthly — bills, salaries, savings targets — this page replaces the phone-calculator ritual.
Limitations
It computes what you enter — check DEG vs RAD mode first, the classic trig error. Display precision is finite (floating-point); for exact symbolic math use a CAS. It is a calculator, not a formula sheet.
Assumptions are stated on the page — read them before trusting the headline number for money, health or legal decisions. A calculator amplifies the quality of its inputs: careful numbers in, trustworthy numbers out.
Frequently asked questions
Degrees or radians?
Check the mode toggle before trig: school problems usually want degrees (DEG); calculus often radians (RAD). Wrong mode = wrong answer. For figures that go into applications or documents, double-check the inputs against the source — the math is exact, but only for the numbers you enter.
How do I do powers?
Use the x^y key: 2^10 = 1024. Parentheses group complex exponents. Try varying one input at a time to see which assumption drives the result; that sensitivity check is often more valuable than the headline number.
Can I see my history?
Yes — the tape lists recent calculations; tap one to reuse it. Save or screenshot the result with its inputs when the figure matters later — reconstructing “what did I enter?” is harder than it sounds.
Why is 0.1+0.2 = 0.30000000000000004?
Binary floating-point cannot represent 0.1 exactly — a universal computing quirk, not a bug. Round for display. For figures that go into applications or documents, double-check the inputs against the source — the math is exact, but only for the numbers you enter.
Is my data uploaded or stored?
No. This tool runs entirely in your browser — what you type or paste never leaves your device, is never sent to a server, and is never stored. Closing the tab removes all trace. Try varying one input at a time to see which assumption drives the result; that sensitivity check is often more valuable than the headline number.
Is it really free? Do I need an account?
Yes, free, and no account needed. Open the page and use it — no sign-up, no trial, no watermark on results. Save or screenshot the result with its inputs when the figure matters later — reconstructing “what did I enter?” is harder than it sounds.
Updated October 2026 · Built and tested by Sharjeel Tahir · How our tools are tested