Roman Numerals Pro A handy and easy to use app to convert Roman numerals to Arabic numbers and vice versa. Features: • Converts Roman numerals to Arabic numbers and vice versa. Just enter either a whole number from 1 to 3,999,999 or a Roman numeral and click '='. • A horizontal bar placed above a Roman numeral indicates multiplication by 1000. • Keyboards to input Roman numerals and Arabic numbers. • The app validates the input of Roman numerals. • Flip button to easily switch between Roman numerals and Arabic numbers. • Roman Numerals Pro stores conversion history (last 25 results). • Results can be sent via email.