In Roman numerals converter: transform Arabic numbers

In Roman numerals online converter

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 numbers to Roman numerals

15 = XV Jan 21 22:29 UTC (GMT)
25 = XXV Jan 21 22:29 UTC (GMT)
12 = XII Jan 21 22:29 UTC (GMT)
2,017 = MMXVII Jan 21 22:29 UTC (GMT)
16 = XVI Jan 21 22:29 UTC (GMT)
3 = III Jan 21 22:29 UTC (GMT)
2,223,785 = (M)(M)(C)(C)(X)(X)MMMDCCLXXXV Jan 21 22:29 UTC (GMT)
1,959 = MCMLIX Jan 21 22:29 UTC (GMT)
10 = X Jan 21 22:29 UTC (GMT)
31 = XXXI Jan 21 22:29 UTC (GMT)
2,017 = MMXVII Jan 21 22:29 UTC (GMT)
15 = XV Jan 21 22:29 UTC (GMT)
7 = VII Jan 21 22:29 UTC (GMT)
converted numbers, see more...

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

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

  • 1 = I (one); 5 = V (five);

  • 10 = X (ten); 50 = L (fifty);

  • 100 = C (one hundred); 500 = D (five hundred);

  • 1,000 = M (one thousand); (*) 5,000 = (V) (five thousand);

  • (*) 10,000 = (X) (ten thousand); (*) 50,000 = (L) (fifty thousand);

  • (*) 100,000 = (C) (one hundred thousand ); (*) 500,000 = (D) (five hundred thousand);

  • (*) 1,000,000 = (M) (one million).

(*) Numbers were also written with a bar above or between two vertical bars. We prefer writing of these larger numerals between brackets, ie: "(" and ")", because: 1) it's easier for the computer users and 2) it also avoids any possible confusion between a vertical bar "|" and a Roman numeral "I" (I = 1).

(*) Numerals written between brackets, ie: (L) = 50,000; the logic is that the initial numeral was multiplied by 1,000, in our case L = 50, (L) = L × 1,000 = 50 × 1,000 = 50,000.

(*) Romans did not use right from the beginning numerals that were larger than 3,999; besides, they had initially no representation for these larger numbers:

  • 5,000 = (V), 10,000 = (X), 50,000 = (L), 100,000 = (C), 500,000 = (D), 1,000,000 = (M).

These symbols were added later on and for them various different notations were used, not necessarily the ones we've just seen. Thus, initially, the maximum number (the largest number) that could be written using Roman numerals was:

  • MMMCMXCIX = 3,999.

Roman numerals basic reading rules


Roman numerals from 1 to 100


Roman numerals from 1 to 1000