Roman Numerals to Number
Free online roman numerals to number converter. Roman numerals are an ancient number system that is still used in many places. In roman numerals, alphabets are used to represent the fixed positive numbers. Free use this Roman numerals to convert numbers from one to thousand into Roman numerals. Or input a Roman numeral to get its regular number value.
Roman Numerals to Number Converter Online
Roman numerals are a system of numerical notation used in ancient Rome and are still used today for various purposes such as numbering chapters in books, numbering lists, or numbering of pages in films and other works of art. The symbols used in the Roman numeral system are:
 I = 1
 V = 5
 X = 10
 L = 50
 C = 100
 D = 500
 M = 1000
In the Roman numeral system, numerals are written from left to right and are combined to form larger numbers. When a smaller numeral appears before a larger numeral, it is subtracted (e.g. IV = 4, IX = 9). When a smaller numeral appears after a larger numeral, it is added (e.g. VI = 6, XI = 11).
How do you convert roman numerals to numbers?
To convert Roman numerals to numbers, follow these steps:

Define the symbols and their corresponding values: I = 1, V = 5, X = 10, L = 50, C = 100, D = 500, M = 1000.

Write down the Roman numeral string from left to right.

If a smaller symbol appears before a larger symbol, subtract it (e.g. IV = 4, IX = 9).

If a smaller symbol appears after a larger symbol, add it (e.g. VI = 6, XI = 11).
Example:
 Roman numeral "XIV" would be 10 + 1 + 5 = 16 in decimal.
 Roman numeral "XXI" would be 10 + 10 + 1 = 21 in decimal.
How do Roman numerals work?
Roman numerals work by using combinations of letters to represent values. The letters used in the Roman numeral system are I, V, X, L, C, D, and M, which represent the values 1, 5, 10, 50, 100, 500, and 1000, respectively.
Numbers are written using these letters and their combinations, with larger values placed before smaller values. For example, the number 4 is represented as "IV" (5  1), and the number 9 is represented as "IX" (10  1).
To form larger numbers, the letters are combined and repeated, with a maximum of three repetitions for each letter. For example, the number 40 is represented as "XL" (50  10), and the number 90 is represented as "XC" (100  10). The largest number that can be represented using Roman numerals is 3,999, which is represented as "MMMCMXCIX".
Roman Numerals Chart
Here is a Roman numeral chart with decimal values and their corresponding Roman numeral representation:
Decimal  Roman Numeral 

1  I 
2  II 
3  III 
4  IV 
5  V 
6  VI 
7  VII 
8  VIII 
9  IX 
10  X 
20  XX 
30  XXX 
40  XL 
50  L 
60  LX 
70  LXX 
80  LXXX 
90  XC 
100  C 
200  CC 
300  CCC 
400  CD 
500  D 
600  DC 
700  DCC 
800  DCCC 
900  CM 
1000  M 
Note: This chart is not exhaustive and only includes the basic symbols and their combinations used in Roman numerals.
Rules to write Roman Numerals
Here are some rules to follow when writing Roman numerals:

Use only the basic symbols: I, V, X, L, C, D, and M.

The largest numeral should always come first. For example, the number 39 is written as "XXXIX" instead of "IXXXX".

When a smaller numeral appears before a larger numeral, it is subtracted (e.g. IV = 4, IX = 9).

When a smaller numeral appears after a larger numeral, it is added (e.g. VI = 6, XI = 11).

Repeat a letter at most 3 times in a row. For example, the number 4 is written as "IV" (5  1), and the number 40 is written as "XL" (50  10).

To form numbers in the thousands, use the symbol "M" with up to three repetitions. For example, the number 3000 is written as "MMM".

Avoid using "V" as the leading numeral in numbers larger than 4,000 as it can be confused with a different symbol. For example, the number 5,000 should be written as "5000" or "Ⅴ".
Practice Questions on Roman Numerals
Here are some practice questions on Roman numerals:

What is the Roman numeral for the number 50?

What is the Roman numeral for the number 100?

What is the Roman numeral for the number 1000?

How would you write the number 9 in Roman numerals?

How would you write the number 39 in Roman numerals?

How would you write the number 499 in Roman numerals?

How would you write the number 3999 in Roman numerals?