What this tool does
The Scientific Calculator evaluates full mathematical expressions right in your browser. Type something like sin(45) + sqrt(2) * 3 and it returns the answer with the correct order of operations — multiplication and division before addition, parentheses first, and powers handled right-to-left the way maths textbooks define them.
It covers everything a basic calculator can’t: trigonometry, logarithms, exponentials, square roots, powers, factorials, and the constants π and e. A DEG/RAD toggle controls how trig functions read their input, so your answers always match the context you’re working in.
How it works
Behind the scenes, your expression is broken into tokens and evaluated by a recursive-descent parser — no eval, no security surprises, and fully deterministic. That means the same expression always returns the same result, and malformed input (mismatched brackets, division by zero, a stray operator) produces a clear error instead of a wrong number.
Why it’s free
This is a one-shot, client-side calculator. There’s no account, no history syncing, and nothing to store on a server — so there’s nothing to gate behind a paywall. It’s free, and it stays free.
Privacy
Every calculation runs locally in your browser. Nothing you type is uploaded, logged, or saved beyond the temporary in-page history that clears when you close the tab.