Number to Roman Number converter to find an equivalent roman number for the given numberal between 1 and 3999. To perform the conversion, enter any numeral value between 1 and 3999 and click on the Convert button provides an equivalent roman number for the given input. ncalculators.com also provides the most commonly used Roman Numerals chart along with this converter. The below chart contains the Roman Numerals from 1 to 20 and their equivalent numbers.