Roman Numeral Converter
Convert between Arabic numbers and Roman numerals instantly — supports 1 to 3,999
Conversion Mode
Enter a Number (1–3999)
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Roman Numeral Symbols
| Symbol | Value | Symbol | Value |
|---|---|---|---|
| I | 1 | L | 50 |
| V | 5 | C | 100 |
| X | 10 | D | 500 |
| IV | 4 | M | 1,000 |
| IX | 9 | CM | 900 |
Result
—
Arabic: —
NoteEnter a number above
Common Year References
2025MMXXV
2024MMXXIV
1947MCMXLVII
1000M
500D
Roman Numeral System
Roman numerals are a numeral system that originated in ancient Rome and remained the standard way of writing numbers throughout Europe into the Late Middle Ages. They use combinations of letters from the Latin alphabet (I, V, X, L, C, D, M) to represent numbers.
The system uses subtraction notation for values like 4 (IV rather than IIII) and 9 (IX). This was standardized around the Middle Ages. The maximum value representable in standard Roman numerals is 3,999 (MMMCMXCIX) — larger numbers require extensions beyond the classic system.
lightbulb Conversion Example
Convert 1994 to Roman:
11000 = M
2900 = CM (1000 − 100)
390 = XC (100 − 10) → 4 = IV
✓ 1994 = MCMXCIV
Rules for Roman Numerals
- Symbols are written largest to smallest, left to right: VIII = 8 (5+3)
- A smaller symbol before a larger one means subtraction: IV = 4, IX = 9, XL = 40, XC = 90, CD = 400, CM = 900
- Only I, X, C, and M can be repeated (up to 3 times): III = 3, XXX = 30, CCC = 300
- V, L, and D are never repeated or used in subtraction position
- Only one small-value symbol may precede a large symbol: IIX is invalid (use VIII)
Where Roman Numerals Are Used Today
- Clock faces: Traditional analog clocks often use Roman numerals (IV for 4, though some use IIII)
- Film titles and sequels: Rocky II, The Godfather Part II, Star Wars Episode VII
- Super Bowl and Olympics: Super Bowl LVIII, Paris 2024 / MMXXIV
- Monarchs and Popes: King Charles III, Pope Francis I
- Book chapters and outlines: Chapter I, Section IV
- Building cornerstones: Year of construction often inscribed in Roman numerals
quizFrequently Asked Questions
Why is 4 written as IV and not IIII in Roman numerals?
The subtractive notation (IV for 4) was not universally standardized in ancient Rome — many ancient inscriptions use IIII for 4 and VIIII for 9. The modern standardized form using IV, IX, XL, XC, CD, and CM was codified during the Middle Ages for clarity and brevity. Some clock faces still use IIII (called "clockmakers' four") — this was historically preferred because it provides visual balance with VIII on the opposite side of the clock face and was easier to cast in metal.
What is the largest number that can be written in standard Roman numerals?
The largest number in standard Roman numerals is 3,999 = MMMCMXCIX. This is because M (1000) can only be repeated up to 3 times in classical notation. To represent 4,000 and above, historical manuscripts used a bar over a letter to indicate multiplication by 1,000 (vinculum notation: V̄ = 5,000, X̄ = 10,000, M̄ = 1,000,000) or enclosed letters in brackets. For practical purposes, most modern uses of Roman numerals (year numbers, chapter numbers, clock faces) fall within 1–3,999.
What year is MMXXV in Roman numerals?
MMXXV = 2025. Breaking it down: MM = 2000 (M+M), XX = 20 (X+X), V = 5. Total: 2000 + 20 + 5 = 2025. Similarly: MMXXIV = 2024, MMXXVI = 2026, MMM = 3000, MCMXCIX = 1999. The year 2000 in Roman numerals is simply MM. The year India became independent (1947) is MCMXLVII.