Convert any given decimal numbers into vulgar fraction using this simple online calculator. A decimal number refers to any number written in decimal notation with base-ten number system. For example : 0.33 is a decimal number. It is equivalent to 33 / 100. Vulgar fraction is a fraction expressed by numerator and denominator, not decimally. 33 / 100 is called as vulgar or simple fractions. Here 33 is numerator and 100 is denominator.