Search for a tool
Roman Numerals

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

Results

Roman Numerals -

Tag(s) : Numeral System, History

Share
Share
dCode and more

dCode is free and its tools are a valuable help in games, maths, geocaching, puzzles and problems to solve every day!
A suggestion ? a feedback ? a bug ? an idea ? Write to dCode!


Please, check our dCode Discord community for help requests!
NB: for encrypted messages, test our automatic cipher identifier!


Feedback and suggestions are welcome so that dCode offers the best 'Roman Numerals' tool for free! Thank you!

Roman Numerals

Roman Numerals to Hindu-Arabic (English) Converter




Roman Numeral Writer




Answers to Questions (FAQ)

What are Roman Numerals? (Definition)

Roman numerals are the name given to the numeral system used in ancient Roman times (especially in the time of Caesar), read from left to right it uses 7 letters whose values are added or subtracted according to their position.

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
IL = 50 - 1 = 49
IC = 100 - 1 = 99
ID = 500 - 1 = 499

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

In theory therefore, any symbol (letter) is repeated a maximum of 3 times consecutively.

Example:

1970 in roman numeralsMCMLXX1971 in roman numeralsMCMLXXI
1972 in roman numeralsMCMLXXII1973 in roman numeralsMCMLXXIII
1974 in roman numeralsMCMLXXIV1975 in roman numeralsMCMLXXV
1976 in roman numeralsMCMLXXVI1977 in roman numeralsMCMLXXVII
1978 in roman numeralsMCMLXXVIII1979 in roman numeralsMCMLXXIX
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

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 writing 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 (the absence of a number indicates zero).

dCode writes either ??, or 0.

How to write four (4) in Roman numerals?

Four is written IV, however, this software indicates 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 date with roman numerals?

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

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

dCode has a tool to write a date in latin.

In some European countries, the centuries are sometimes written in Roman numerals.

What is the biggest number in roman numerals?

Numbers above 10000 were not thinkable, without any calculation tool, they were 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 negative numbers in roman numerals?

The negative writing is not recognized, it probably did not exist. The notion of positive or negative numbers 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, including a duodecimal currency system (base 12) which allowed sharing by 2, 3, 4, 6 and 12 without decimal places.

When were Roman Numerals invented?

Roman numerals were born with 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 meaning:

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

Can there be more than 4 identical consecutive letters?

Roman numerals can be written with 4 identical letters in a row, but this is rare or incorrect.

Example: 4000 can be written MMMM or the watchmaker's four is written IIII

When to use Roman Numerals?

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

Source code

dCode retains ownership of the "Roman Numerals" source code. Except explicit open source licence (indicated Creative Commons / free), the "Roman Numerals" algorithm, the applet or snippet (converter, solver, encryption / decryption, encoding / decoding, ciphering / deciphering, breaker, translator), or the "Roman Numerals" functions (calculate, convert, solve, decrypt / encrypt, decipher / cipher, decode / encode, translate) written in any informatic language (Python, Java, PHP, C#, Javascript, Matlab, etc.) and all data download, script, or API access for "Roman Numerals" are not public, same for offline use on PC, mobile, tablet, iPhone or Android app!
Reminder : dCode is free to use.

Cite dCode

The copy-paste of the page "Roman Numerals" or any of its results, is allowed (even for commercial purposes) as long as you credit dCode!
Exporting results as a .csv or .txt file is free by clicking on the export icon
Cite as source (bibliography):
Roman Numerals on dCode.fr [online website], retrieved on 2024-06-14, https://www.dcode.fr/roman-numerals

Need Help ?

Please, check our dCode Discord community for help requests!
NB: for encrypted messages, test our automatic cipher identifier!

Questions / Comments

Feedback and suggestions are welcome so that dCode offers the best 'Roman Numerals' tool for free! Thank you!


https://www.dcode.fr/roman-numerals
© 2024 dCode — El 'kit de herramientas' definitivo para resolver todos los juegos/acertijos/geocaching/CTF.
 
Feedback