Roman Numeral Converter
Convert numbers to Roman numerals and Roman numerals back to numbers instantly. You can also convert a calendar date into Roman numerals.
Roman numeral converter
Roman Numeral Date Converter
Convert a calendar date into Roman numerals in both Day / Month / Year and Month / Day / Year order.
ROMAN NUMERAL DATE
DAY / MONTH / YEAR
—
MONTH / DAY / YEAR
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Roman Numerals Explained
Roman numerals use combinations of seven letters:
I = 1V = 5X = 10L = 50C = 100D = 500M = 1000
Standard subtractive combinations include IV = 4, IX = 9, XL = 40, XC = 90, CD = 400 and CM = 900.
Useful Roman Numeral Conversions
| Number | Roman numeral |
|---|---|
| 1 | I |
| 2 | II |
| 3 | III |
| 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 |
| 2000 | MM |
| 2026 | MMXXVI |
| 3999 | MMMCMXCIX |
What can you use a Roman numeral converter for?
- converting numbers to Roman numerals
- converting Roman numerals back to numbers
- checking Roman numeral answers
- quizzes and schoolwork
- reading years on buildings, monuments, books, and film credits
- clocks and numbering
- anniversaries
- engravings
- converting dates into Roman numerals
How to use the Roman Numeral Converter
- Enter a number from 1 to 3,999 to get its Roman numeral.
- Or enter a Roman numeral to convert it back to a number.
- To convert a date, use the Roman Numeral Date Converter below the main converter.
Frequently asked questions
2026 is MMXXVI in Roman numerals.
Enter a whole number from 1 to 3,999 in the NUMBER field. The converter applies the standard additive and subtractive Roman numeral rules and updates the ROMAN NUMERAL field immediately.
Yes. Enter a Roman numeral in the ROMAN NUMERAL field, and the corresponding number appears immediately in the NUMBER field. Input is case-insensitive.
Choose a date in the Roman Numeral Date Converter. The day, month and year are converted separately and shown in both Day / Month / Year and Month / Day / Year order.
3,999 (MMMCMXCIX) is the largest value supported. The tool intentionally uses standard modern Roman numeral notation without overlines or vinculum notation.
The classical Roman numeral system did not have a standard numeral for zero, so this converter supports values from 1 to 3,999.