Quickly convert Roman Numerals, Decimal Numbers and Dates. Learn Roman Number from 1 to 1000 with ease. Having a hard time learning Roman numerals? The Roman Numerals app is a simple application which can help you learn Roman Numbers. The application offers the conversion of numbers from Decimal to Roman and vice versa. This app supports decimal numbers up to about a million, so even if you want to convert bigger numbers you can use this tool. Why is it important to learn Roman numerals? Roman numerals can be seen on clock faces, ancient dates, in movies and on ancient buildings. We hope you will find the Roman Numerals application useful and fun!