Roman Numeral Converter

Instantly convert any number to Roman numerals — or decode Roman numerals back to a number. Includes full chart, rules, and history.

⚡ Instant🔄 Both Directions📋 Full Chart 1–3999📖 Rules Guide✦ 100% Free

XIV

Number ↔ Roman Numeral Converter

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Roman Numeral Result

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The 7 Roman Numeral Symbols

X10

L50

C100

D500

M1,000

All Roman numerals are built exclusively from these seven letters. The highest standard value is 3,999 (MMMCMXCIX). Numbers beyond that historically used a bar over a letter to multiply by 1,000.

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How Roman Numerals Work

Additive principle— place larger values first; smaller values to the right are added.VI = 5 + 1 = 6 | XV = 10 + 5 = 15

Subtractive notation— a smaller valuebeforea larger value is subtracted, not added.IV = 5 − 1 = 4 | IX = 10 − 1 = 9 | XL = 40 | CM = 900

Repetition rule— a symbol may repeat up tothreetimes in a row; after that, use subtraction.III = 3 ✓ | IIII = 4 ✗ → use IV

V, L, D are never repeated— they appear at most once each.VV = 10 ✗ → use X | LL = 100 ✗ → use C

Valid subtraction pairs only— I before V/X · X before L/C · C before D/M. Other combinations (IL, IC, VX…) are not standard.IL ✗ → XLIX = 49 ✓ | IC ✗ → XCIX = 99 ✓

A Brief History

Roman numerals evolved from Etruscan tally marks around 900–800 BC. The system spread across the Roman Empire and remained Europe's dominant numeral system through the Middle Ages. Arabic numerals (0–9) gradually replaced them for arithmetic after the 13th century, but Roman numerals persisted in formal contexts.

Where Roman Numerals Are Used Today

Clock faces and watch dials (I–XII)
Book chapter and volume numbering
Film sequels and Super Bowl editions (e.g., Super Bowl LVIII)
Year of production in films and TV credits
Monarchs and popes (King Charles III, Pope John Paul II)
Outlines in academic and legal writing
Olympic Games numbering

Common Examples to Memorize

IV = 4 · IX = 9 · XL = 40 · XC = 90
CD = 400 · CM = 900
MCMXCIX = 1999 · MM = 2000 · MMXXIV = 2024

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Roman Numerals Chart

Number	Roman	Note

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Frequently Asked Questions

What is the Roman numeral for 2024?

2024 in Roman numerals isMMXXIV. Breaking it down: MM = 2000, XX = 20, IV = 4. So MM + XX + IV = 2024.

What is the largest number you can write in Roman numerals?

Using standard rules (no overline), the largest number is3,999, written asMMMCMXCIX. The Romans used a vinculum (bar over a letter) to multiply by 1,000 for larger numbers, but this is rarely used today.

Why is 4 written as IV and not IIII?

The rule states that no symbol can repeat more than three times consecutively. To write 4, you use the subtractive notation IV (5 − 1). Interestingly, many old clock faces still use IIII instead of IV — likely for visual symmetry and because clock-makers traditionaly used IIII.

How do you write 1000 in Roman numerals?

1000 is written asM. The letter M comes from the Latin wordmille, meaning "thousand." So 2000 = MM, 3000 = MMM, and 1999 = MCMXCIX.

Is there a Roman numeral for zero?

No — the Roman numeral system has no symbol for zero. This is one of its main limitations for arithmetic. Medieval scholars sometimes used the Latin wordnulla(meaning "none") as a placeholder, but zero as a concept only arrived in Europe with Arabic numerals in the Middle Ages.

How do you read Roman numerals on a clock?

Clock faces use I through XII (1–12). Note that many clock faces write 4 asIIIIrather thanIV— a historical convention for balance and easy casting of clock faces. All other numbers follow standard rules: VI = 6, IX = 9, XI = 11, XII = 12.

What year is MCMXCIX?

MCMXCIX =1999. Breakdown: M = 1000, CM = 900, XC = 90, IX = 9. Total: 1000 + 900 + 90 + 9 = 1999. It's often cited as one of the most complex-looking Roman numeral years.