The number 1001 is written in Roman numerals like this: MI
MI = 1001
Split the number by place value and write each part in Roman numerals:
Put the parts together: M + I = MI.
As a year, 1001 is written MI. You often see dates like this in film credits, on buildings and on monuments.
Going the other way? See the Roman numeral MI.
Calculate the conversion of any number and its equivalent in Roman numerals with our Roman numerals converter.