It includes fifteen expression calculators, float number converters,unit converters,expression converters, matrix calculator, complex calculator, liner equation calculator.Binary,Octal,Decimal,hex float numbers can be calculated in one expression. Different complex can be calculated in one expression. Different units in one category can be calculated in one expression. It can calculate the expression in the text file.Float number converters can convet the number in binary,octal,decimal,hex scale. Expression converters can also convert the expression among different scales.