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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.

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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.

Answers to Questions

What are the letters to write in Roman Numerals?

Roman numeration uses 7 letters corresponding to 7 numbers:

I1
V5
X10
L50
C100
D500
M1000

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

However, some archaic scripts 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

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, they did not consider it as a digit, so they did not write it.

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?

On estimates that roman numerals are born with the Antique Rome, so starting at the 7th century BC

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