Need to convert Roman numerals into numbers or numbers into Roman numerals? Our free Roman Numeral Converter makes it quick and easy. Enter a Roman numeral or a whole number, choose the conversion you need, and get the result instantly. It is useful for learning Roman numerals, checking dates and numbers, schoolwork, and everyday calculations.
How to Use the Roman Numeral Converter
Using the Roman Numeral Converter is simple.
- Enter a whole number or Roman numeral in the input box.
- Choose the conversion you need.
- Click Convert.
- The equivalent value will appear in the result box.
For example, enter 2026 and choose Number to Roman Numeral. The result will be MMXXVI.
If you choose Roman Numeral to Number, enter MMXXVI to get 2026.
What Are Roman Numerals?
Roman numerals are a number system that was used in ancient Rome. Instead of using the digits 0 through 9, Roman numerals use letters to represent values.
The main Roman numeral symbols are:
| Symbol | Value |
|---|---|
| I | 1 |
| V | 5 |
| X | 10 |
| L | 50 |
| C | 100 |
| D | 500 |
| M | 1000 |
These symbols can be combined to create larger numbers.
For example:
- III = 3
- VIII = 8
- XII = 12
- XX = 20
- XL = 40
- C = 100
- D = 500
- M = 1000
How Roman Numerals Work
Roman numerals generally use addition when a smaller value comes after a larger value.
For example:
VIII = 5 + 1 + 1 + 1 = 8
Some combinations use subtraction. When a smaller symbol appears before a larger symbol, the smaller value is subtracted.
For example:
IV = 4
IX = 9
XL = 40
XC = 90
CD = 400
CM = 900
These combinations are commonly used when writing standard Roman numerals.
Roman Numeral Examples
Here are some common numbers and their Roman numeral equivalents:
| Number | Roman Numeral |
|---|---|
| 1 | I |
| 4 | IV |
| 5 | V |
| 9 | IX |
| 10 | X |
| 20 | XX |
| 40 | XL |
| 50 | L |
| 90 | XC |
| 100 | C |
| 400 | CD |
| 500 | D |
| 900 | CM |
| 1000 | M |
| 2026 | MMXXVI |
Number to Roman Numeral
To convert a number into a Roman numeral, the number is broken down into its Roman numeral values.
For example:
2026 = 2000 + 20 + 6
So:
2026 = MMXXVI
The converter handles this calculation automatically.
Roman Numeral to Number
You can also use the converter in the opposite direction.
For example:
MMXXVI = 2026
The converter reads each Roman numeral symbol and calculates the corresponding number.
Where Are Roman Numerals Used?
Roman numerals are still used in many places today. You may see them on:
- Clock faces
- Book chapters
- Movie sequels
- Historical dates
- Events and competitions
- Names of kings and popes
- Outlines and numbered sections
- Buildings and monuments
They are also commonly used when a traditional or formal numbering style is preferred.
Roman Numerals from 1 to 3999
This converter supports standard Roman numeral notation for whole numbers from 1 to 3999.
The largest standard Roman numeral symbol is M, which represents 1000. Numbers such as 2000 and 3000 can be written as MM and MMM.
For example:
- 1000 = M
- 2000 = MM
- 3000 = MMM
- 3999 = MMMCMXCIX
Why Use a Roman Numeral Converter?
Converting Roman numerals by hand can be confusing, especially with larger numbers or subtraction combinations.
A converter gives you the equivalent value quickly and can be useful when:
- Learning Roman numerals
- Checking homework
- Reading historical references
- Understanding dates
- Converting numbers for documents
- Checking Roman numeral spellings
Frequently Asked Questions
What is the Roman numeral for 10?
The Roman numeral for 10 is X.
What is the Roman numeral for 50?
The Roman numeral for 50 is L.
What is the Roman numeral for 100?
The Roman numeral for 100 is C.
What is the Roman numeral for 500?
The Roman numeral for 500 is D.
What is the Roman numeral for 1000?
The Roman numeral for 1000 is M.
What is the Roman numeral for 2026?
The Roman numeral for 2026 is MMXXVI.
Can I convert Roman numerals back to numbers?
Yes. Select Roman Numeral to Number, enter a Roman numeral, and click Convert.
What numbers does this converter support?
The Number to Roman Numeral option supports standard Roman numerals from 1 to 3999.
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