Scientific Calculator
A full scientific calculator with trig, logs, powers, roots and parentheses - type on the display or tap the keys, with the last ten results kept for reuse.
Order of operations, done right
This is not a calculator that adds up left to right. It parses your whole expression and
applies proper precedence: parentheses first, then powers and roots, then multiply and
divide, then add and subtract. That is why 2 + 3 * 4 is 14, while
(2 + 3) * 4 is 20. Powers are right-associative, so 2^3^2 is
2^(3^2) = 512. Implicit multiplication works too:
2(3 + 1) is 8 and 2pi is about 6.283.
The DEG vs RAD trap
The single most common wrong answer people get from a scientific calculator is a trig
function in the wrong angle mode. In degrees, sin(30) = 0.5. In radians the same
keystrokes give roughly -0.988, because 30 radians is nearly five full turns.
This tool starts in DEG and shows the mode clearly above the keypad. Inverse trig
(sin⁻¹, cos⁻¹, tan⁻¹)
returns its answer in the current mode as well.
Worked examples
5!= 120 - factorial multiplies 5 x 4 x 3 x 2 x 1.sqrt(144)= 12, andlog(1000)= 3 (base 10).ln(e)= 1, since natural log is base e.2^10= 1024, and(1/0)shows an error rather than infinity.
Domain errors are caught and explained in plain words: the square root of a negative number, the log of zero, a factorial of a decimal, or a division by zero all show a friendly message instead of NaN. For quick everyday sums try the percentage calculator, and for working with fractions the fraction calculator keeps things exact.