Operators: + − * / ^, parentheses, postfix ! (factorial), % (divide by 100). Exponentiation associates right; -2^2 = -4. Functions: sin cos tan asin acos atan sqrt abs ln log (base 10) exp floor ceil round. Constants: pi, e, ans (last result). Select radians or degrees for trigonometry. Use * explicitly. Real scalar arithmetic only; 500-character limit, 30 history entries. Units are handled in Aviation Unit Converters.