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Roman Numerals Conversion

Tool to convert from/in Roman numerals: a numbering system with seven letters (I, V, X, L, C, D et M) allowing to write integer numbers and used in Antique Rome and make conversions.

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Roman Numerals Conversion -

Tag(s) : Numeral System, History

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Roman Numerals Conversion

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Convert from/to Roman Numerals



Tool to convert from/in Roman numerals: a numbering system with seven letters (I, V, X, L, C, D et M) allowing to write integer numbers and used in Antique Rome and make conversions.

Answers to Questions

What are the letters to write in Roman Numerals?

Roman numeration uses 7 letters corresponding to 7 numbers. Roman digits chart from 1 to 1000:

I1
V5
X10
L50
C100
D500
M1000

Beyond several thousands, there are no letters to represent these numbers.

However, some archaic scripts (more rare) used 4 other symbols

Ɔ500
1000
5000
10000

How to read/write with Roman numerals?

Roman numeral system uses two rules:

(1) - Any letter \( L_2 \) placed to the right of another letter \( L_1 \) are added if \( L_2 \ leq L_1 \)

Example: VI = 5 + 1 = 6
XX = 10 + 10 = 20

(2) - Any letter of unit \( L_1 = \rm{I} \) placed immediately to the left of another letter \( L_2 \neq \rm{I} \) is subtracted.

Example: IV = 5 - 1 = 4 IX = 10 - 1 = 9

Rule (2) is sometimes extended to: Any letter \( L_1 \) placed immediately to the left of another letter \( L_2 > L_1 \) is subtracted.

Example: XC = 100 - 10 = 90

Example:

1980 in roman numeralsMCMLXXX1981 in roman numeralsMCMLXXXI
1982 in roman numeralsMCMLXXXII1983 in roman numeralsMCMLXXXIII
1984 in roman numeralsMCMLXXXIV1985 in roman numeralsMCMLXXXV
1986 in roman numeralsMCMLXXXVI1987 in roman numeralsMCMLXXXVII
1988 in roman numeralsMCMLXXXVIII1989 in roman numeralsMCMLXXXIX
1990 in roman numeralsMCMXC1991 in roman numeralsMCMXCI
1992 in roman numeralsMCMXCII1993 in roman numeralsMCMXCIII
1994 in roman numeralsMCMXCIV1995 in roman numeralsMCMXCV
1996 in roman numeralsMCMXCVI1997 in roman numeralsMCMXCVII
1998 in roman numeralsMCMXCVIII1999 in roman numeralsMCMXCIX
2000 in roman numeralsMM2001 in roman numeralsMMI
2002 in roman numeralsMMII2003 in roman numeralsMMIII
2004 in roman numeralsMMIV2005 in roman numeralsMMV
2006 in roman numeralsMMVI2007 in roman numeralsMMVII
2008 in roman numeralsMMVIII2009 in roman numeralsMMIX
2010 in roman numeralsMMX2011 in roman numeralsMMXI
2012 in roman numeralsMMXII2013 in roman numeralsMMXIII
2014 in roman numeralsMMXIV2015 in roman numeralsMMXV
2016 in roman numeralsMMXVI2017 in roman numeralsMMXVII
2018 in roman numeralsMMXVIII2019 in roman numeralsMMXIX
2020 in roman numeralsMMXX2021 in roman numeralsMMXXI
2022 in roman numeralsMMXXII2023 in roman numeralsMMXXIII
2024 in roman numeralsMMXXIV2025 in roman numeralsMMXXV
2026 in roman numeralsMMXXVI2027 in roman numeralsMMXXVII
2028 in roman numeralsMMXXVIII2029 in roman numeralsMMXXIX
2030 in roman numeralsMMXXX2031 in roman numeralsMMXXXI
2032 in roman numeralsMMXXXII2033 in roman numeralsMMXXXIII

How does the converter from/to Roman numerals work?

The program automatically detects whether the number is in Arabic or Roman numerals and makes the conversion/translation.

Roman numeration does not permit to write large numbers, beyond 9999 the program will display the number of thousands separately. This writing is not standardized but remains comprehensible.

The program is very permissive and allows badly formed Roman numbers not complying with the rule (2).

Example: IVX is translated as 6

How to write zero (0) in Roman numerals?

Romans did not use the zero, for them it was not a digit but a state of emptiness, so they did not write it.

dCode writes either ??, or 0.

How to write four (4) in Roman numerals?

Four is written IV, however, this software indicated that IIII = 4, unusual, IIII is a variant of IV which is tolerated. It can be found today (typically in watches, or clocks).

How to write a birth date with roman numerals?

There is no specific way to write a birthdate, except to write the number of the day, the month and the year separately.

Example: 12 / 06 / 2008 = XII / VI / MMVIII

What is the biggest number in roman numerals?

Numbers above 10000 where not thinkable, without any calculation tool, they wee useless. If you wish to write a value of hundreds of thousands, one can imagine writing hundreds of M at the beginning of the number.

Example: 9999 = MMMMMMMMMCMXCIX (a bit ridiculous)

How to write a negative numbers in roman numerals?

The negative writing is not recognized, it probably did not exist. The notion of positive or negative number is related to the concept of zero (which was not known to the Romans).

However, today, adding a - can help to be understood.

Example: -XXV = -25

How to write a decimal number in roman numerals?

Using decimal numbers is very few documented in history books, however, it is probable that they used fractions.

When Roman Numerals have been invented?

Roman numerals are born with the Antique Rome, so starting at the 7th century BC. For example, they were used with Latin.

How to write Roman Numerals with Unicode?

Roman numerals have been added to the Unicode standard, they encode by a single character each number from 1 to 12 (used in clocks and watches) and 8 other numbers:

Unicode characterValueUnicode characterValueUnicode characterValue
123
456
789
101112
50100Ɔ500
50010001000
500010000

When to use Roman Numerals?

Roman numerals are learned at school in primary school bur are rarely used except in mathematics or history. The uses today are limited to clocks, dates, but also on tatoos, many tattoos use Roman numerals.

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Source code

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Questions / Comments


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