A full scientific calculator that evaluates a whole expression at once rather than one button press at a time. Type something like sin(30) + sqrt(16) * 2 or log(1000) + pi, and it computes the result respecting the correct order of operations and parentheses. It supports the common scientific functions including sine, cosine and tangent (in degrees), natural and base-ten logarithms, exponents, roots, factorials and the constants pi and e. Because you can see and edit the full expression before evaluating, it is easier to catch mistakes than with a traditional button-by-button calculator. The parser is self-contained and safe, running entirely in your browser with no external libraries. Type your expression and press evaluate to get an instant answer.