Scientific Calculator

About the Scientific Calculator

This is a full scientific calculator for the maths a basic calculator can't handle — trigonometry, logarithms, powers, roots, factorials and constants like π and e. It's built for students, engineers, and anyone doing science or advanced maths who needs these functions without hunting for a physical calculator. Build an expression with the buttons and it shows a live result as you go, plus the final answer when you press equals.

How it works — the functions

• Trigonometry: sin, cos and tan, with a DEG/RAD toggle so angles are read in degrees or radians (degrees by default).
• Logarithms: ln (natural log, base e) and log (base 10).
• Powers and roots: xʸ for any power and √ for square root.
• Factorial: n! for whole numbers.
• Constants: π and e.
• Plus parentheses for grouping and the four basic operations.

Expressions follow the standard order of operations (parentheses, powers, then multiply/divide, then add/subtract), and the result previews live as you build it.

Assumptions and behaviour

• Trig mode defaults to degrees; tap DEG/RAD to switch — this is the setting people most often get caught out by.
• log is base 10 and ln is base e, the usual convention.
• Standard operator precedence and parentheses apply.
• Results are shown to about 12 significant figures and cleaned up for display.

Limitations

• Check the DEG/RAD mode before trusting a trig result — sin(90) is 1 in degrees but about 0.894 in radians.
• It uses standard floating-point arithmetic, so results can carry tiny rounding errors (a value that should be exactly 0 may show as a minuscule number).
• It's a calculator, not a computer-algebra system — no symbolic algebra, equation solving, matrices, complex numbers, or graphing.
• Factorials are for non-negative whole numbers and grow huge quickly (beyond about 170! the result exceeds what can be represented).

Privacy

All calculations run entirely in your browser. Nothing is uploaded or stored.