Converter of Arabic numbers to Roman numerals, result and explanations. Learn how to convert to Roman numerals

Online converter of Arabic numbers to Roman numerals

Learn how to convert to Roman numerals:

1: Break the number (decompose it) into place value subgroups;

2: Convert each subgroup;

3: Wrap up the Roman numeral.

Latest conversions of Arabic numbers to Roman numerals

17,993 = (X)(V)MMCMXCIII Feb 21 22:06 UTC (GMT)
691,645 = (D)(C)(X)(C)MDCXLV Feb 21 22:06 UTC (GMT)
43,248 = (X)(L)MMMCCXLVIII Feb 21 22:06 UTC (GMT)
334,571 = (C)(C)(C)(X)(X)(X)M(V)DLXXI Feb 21 22:06 UTC (GMT)
1,110,916 = (M)(C)(X)CMXVI Feb 21 22:06 UTC (GMT)
719,287 = (D)(C)(C)(X)M(X)CCLXXXVII Feb 21 22:06 UTC (GMT)
1,352,091 = (M)(C)(C)(C)(L)MMXCI Feb 21 22:06 UTC (GMT)
384,241 = (C)(C)(C)(L)(X)(X)(X)M(V)CCXLI Feb 21 22:06 UTC (GMT)
1,241,980 = (M)(C)(C)(X)(L)MCMLXXX Feb 21 22:06 UTC (GMT)
19,936 = (X)M(X)CMXXXVI Feb 21 22:06 UTC (GMT)
68,000 = (L)(X)(V)MMM Feb 21 22:06 UTC (GMT)
1,817 = MDCCCXVII Feb 21 22:06 UTC (GMT)
504,046 = (D)M(V)XLVI Feb 21 22:06 UTC (GMT)
converted numbers, see more...

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

The major set of symbols on which the rest of the Roman numberals were built:

  • I = 1 (one); V = 5 (five);

  • X = 10 (ten); L = 50 (fifty);

  • C = 100 (one hundred);

  • D = 500 (five hundred);

  • M = 1,000 (one thousand);

    • For larger numbers:

    • (*) V = 5,000 or |V| = 5,000 (five thousand); see below why we prefer this notation: (V) = 5,000.

    • (*) X = 10,000 or |X| = 10,000 (ten thousand); see below why we prefer this notation: (X) = 10,000.

    • (*) L = 50,000 or |L| = 50,000 (fifty thousand); see below why we prefer this notation: (L) = 50,000.

    • (*) C = 100,000 or |C| = 100,000 (one hundred thousand); see below why we prefer this notation: (C) = 100,000.

    • (*) D = 500,000 or |D| = 500,000 (five hundred thousand); see below why we prefer this notation: (D) = 500,000.

    • (*) 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.

Roman numerals reading rules, summary:

I. The Roman numerals set of basic symbols

II. The rule of numerals repetition

III. Subtractive notation of the Roman numerals

IV. Additive notation of the Roman numerals


How to convert Arabic numbers to Roman numerals: breaking down into place value subgroups

Examples of converting Arabic numbers to Roman numerals


Roman numerals from 1 to 100

Roman numerals from 1 to 1000

Mathematical operations with Roman numerals:

I. Addition. Learn by example how to add Roman numerals the right way, like the Romans calculated, steps, explanations

II. Subtraction. Learn by example how to subtract Roman numerals the right way, like the Romans calculated, steps, explanations

III. Addition and subtraction. Learn by example how to add and subtract Roman numerals the right way, like the Romans calculated, steps, explanations