Scientific Calculator
Full scientific calculator.
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About Scientific Calculator
A full scientific calculator that runs entirely in your browser. Enter expressions with the button pad or your keyboard and get instant results for arithmetic, powers, roots, factorials, logarithms, and the trig functions sine, cosine, and tangent, plus the constants pi and e. A Deg/Rad toggle controls how angles are read.
Every calculation is parsed by a safe, built-in math engine (no risky code evaluation) so invalid input shows a friendly message instead of crashing. It is completely free, requires no sign-up, and nothing you type ever leaves your device.
Frequently asked questions
- Is the scientific calculator free to use?
- Yes. It is 100% free with no account, sign-up, or usage limits. Use it as often as you like.
- Is my data uploaded or stored anywhere?
- No. Every calculation runs locally in your browser using JavaScript. Nothing you type is sent to a server, logged, or saved, so your work stays completely private.
- What functions and operators does it support?
- Addition, subtraction, multiplication, division, modulo (%), parentheses, powers (x^y and x squared), square root, factorial (n!), natural log (ln), base-10 log, and the trig functions sin, cos, and tan, plus the constants pi and e.
- How do I switch between degrees and radians?
- Use the Deg/Rad toggle at the top. In Deg mode, sin, cos, and tan interpret their input as degrees (so sin(30) is 0.5); in Rad mode they use radians.
- Can I type with my keyboard instead of clicking buttons?
- Yes. You can type digits, + - * / operators, ^, !, and parentheses. Press Enter or = to evaluate, Backspace to delete, and Esc to clear everything.
- What happens if I enter an invalid expression?
- The calculator never crashes or shows NaN. Incomplete or invalid input like a missing parenthesis, the square root of a negative number, or dividing by zero produces a clear, plain-language error message instead.