# Validate and Convert Roman numerals to Arabic numbers, turn numeral system letters into ordinary digits, with explanations

## Latest validations and conversions of Roman numerals to Arabic numbers

 MDC = 1,600? How to convert the Roman numeral? Is it valid or not? May 26 22:13 UTC (GMT) MMXVI = 2,016? How to convert the Roman numeral? Is it valid or not? May 26 22:13 UTC (GMT) XL = 40? How to convert the Roman numeral? Is it valid or not? May 26 22:13 UTC (GMT) CCC = 300? How to convert the Roman numeral? Is it valid or not? May 26 22:12 UTC (GMT) CCC = 300? How to convert the Roman numeral? Is it valid or not? May 26 22:12 UTC (GMT) MDCCCLXVII = 1,867? How to convert the Roman numeral? Is it valid or not? May 26 22:12 UTC (GMT) CMXCVI = 996? How to convert the Roman numeral? Is it valid or not? May 26 22:11 UTC (GMT) MCCCXLI = 1,341? How to convert the Roman numeral? Is it valid or not? May 26 22:11 UTC (GMT) MMM = 3,000? How to convert the Roman numeral? Is it valid or not? May 26 22:11 UTC (GMT) CCCLIV = 354? How to convert the Roman numeral? Is it valid or not? May 26 22:10 UTC (GMT) XL = 40? How to convert the Roman numeral? Is it valid or not? May 26 22:10 UTC (GMT) MM = 2,000? How to convert the Roman numeral? Is it valid or not? May 26 22:10 UTC (GMT) MCMXCVIII = 1,998? How to convert the Roman numeral? Is it valid or not? May 26 22:09 UTC (GMT) All the Roman numerals that our visitors tried to convert to Arabic numbers...

## The set of basic symbols of the Roman system of writing numerals

• ### (*) M = 1,000,000 or |M| = 1,000,000 (one million); see below why we prefer this notation: (M) = 1,000,000.

(*) These numbers were written with an overline (a bar above) or between two vertical lines. Instead, we prefer to write these larger numerals between brackets, ie: "(" and ")", because:

• 1) when compared to the overline - it is easier for the computer users to add brackets around a letter than to add the overline to it and
• 2) when compared to the vertical lines - it avoids any possible confusion between the vertical line "|" and the Roman numeral "I" (1).

(*) An overline (a bar over the symbol), two vertical lines or two brackets around the symbol indicate "1,000 times". See below...

Logic of the numerals written between brackets, ie: (L) = 50,000; the rule is that the initial numeral, in our case, L, was multiplied by 1,000: L = 50 => (L) = 50 × 1,000 = 50,000. Simple.

(*) At the beginning Romans did not use numbers larger than 3,999; as a result they had no symbols in their system for these larger numbers, they were added on later and for them various different notations were used, not necessarily the ones we've just seen above.

Thus, initially, the largest number that could be written using Roman numerals was:

• MMMCMXCIX = 3,999.