4 in Roman numerals, how to write?

4 = IV
Clear explanations below...

Explanations / Learn how to convert in Roman numerals

4 = 5 - 1 = V - I = IV;

Roman system of writing numerals basic symbols:

I = 1; V = 5; X = 10; L = 50; C = 100; D = 500; M = 1,000; (V) = 5,000; (X) = 10,000; (L) = 50,000; (C) = 100,000; (D) = 500,000; (M) = 1,000,000;
Reading rules
Writing numbers: a comma ',' is used as thousands separator (whenever the case);

4 = IV

Arabic numbers converter into Roman numerals

Latest conversions from numbers into Roman numerals

4 = IV Feb 28 12:10 UTC (GMT)
2,012 = MMXII Feb 28 12:10 UTC (GMT)
1,952 = MCMLII Feb 28 12:10 UTC (GMT)
25 = XXV Feb 28 12:10 UTC (GMT)
3 = III Feb 28 12:10 UTC (GMT)
27 = XXVII Feb 28 12:10 UTC (GMT)
12 = XII Feb 28 12:10 UTC (GMT)
1,930 = MCMXXX Feb 28 12:10 UTC (GMT)
65,365 = (L)(X)(V)CCCLXV Feb 28 12:10 UTC (GMT)
16 = XVI Feb 28 12:10 UTC (GMT)
30 = XXX Feb 28 12:10 UTC (GMT)
10 = X Feb 28 12:10 UTC (GMT)
2,013 = MMXIII Feb 28 12:09 UTC (GMT)

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) *

* Number was also written with a bar above or between two vertical bars. We prefer writing in brackets because it is more accessible to computer users and also removes any ambiguity between a vertical bar | and a Roman numeral I.

* Romans did not use numbers higher than 3999 right from the beginning, they were having no representation for numbers like 5,000, 10,000, 50,000, 100,000, 500,000, 1,000,000. These were later added and for them various different notations were used, not necessarily the ones above. Thus, initially, the maximum number that could be written with Roman numerals was: MMMCMXCIX (3999).

Important numbers :-) written with Roman numerals

  • 365 = CCCLXV: Number of days within a year, until it's going to be your birthday, again!
  • 366 = CCCLXVI: Number of days within a leap year (and yes, until it's going be your birthday, again!).
  • 10 = X: 10 fingers on hands, decimal numeration system, the maximum grade in school, top ten list, the 10 Commandments of the Bible, etc.
  • 7 = VII: The seven days of the week, seven wonders, the seven colors of the rainbow, the seven magnificents, lucky number of Gods, etc.
  • 8 = VIII: Number of perfection.
  • 12 = XII: The twelfth hour, the twelve apostles.
  • 13 = XIII: Unlucky Number ;-).
  • 18 = XVIII: The age of 18th.