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Roman numerals still appear all around us — on clock faces, book chapters, movie credits, monarch names and building dates — but reading and writing them isn't obvious once you're past a few letters. This converter turns any number into its Roman form and any valid Roman numeral back into a number, following the strict rules.
Pick the direction, enter your value, and the conversion appears instantly.
Roman Numeral Converter: step-by-step worked example
- Direction
- Number → Roman numeral
- Value
- 1999
- 1
Break down with the value table
M 1000 · CM 900 · D 500 · CD 400 · C 100 · XC 90 · L 50 · XL 40 · X 10 · IX 9 · V 5 · IV 4 · I 1 — largest first
1999 = 1000 + 900 + 90 + 9 = M=1000 · CM=900 · XC=90 · IX=9
- 2
Subtraction rule
A smaller symbol before a larger one is subtracted (IV = 5 − 1, CM = 1000 − 100); otherwise added
+1000 −100 +1000 −10 +100 −1 +10 = 1,999
- 3
Result
Number → Roman: write the symbols side by side · Roman → Number: add the signed values (1–3999)
M + CM + XC + IX = MCMXCIX
- 4
Canonical-form check
Converting back must give the same spelling (forms like IIII or VX are rejected)
= MCMXCIX ⇄ 1999 ✓
- M1,000
- CM900
- XC90
- IX9
Good to know: Standard Roman numerals top out at 3999 (MMMCMXCIX) and have no zero or fractions. Clock faces showing IIII for 4 are a traditional exception; the standard form is IV.
Roman Numeral Converter — how it works
The seven symbols
| Symbol | Value |
|---|---|
| I | 1 |
| V | 5 |
| X | 10 |
| L | 50 |
| C | 100 |
| D | 500 |
| M | 1,000 |
The rules
- Symbols are written largest to smallest and added: XVI = 10 + 5 + 1 = 16.
- Subtraction: a smaller symbol before a larger one is subtracted — IV = 4 (not IIII), IX = 9, XL = 40, CM = 900.
- Only I, X and C are used for subtraction, and only before the next one or two sizes up. That's why 4 is IV, never IIII, and 99 is XCIX, not IC.
- The same symbol repeats at most three times (III = 3, but 4 switches to IV).
The range
Standard Roman numerals cover 1 to 3,999. There's no symbol for zero, and numbers above 3,999 need overlines (a bar meaning ×1,000), which this converter doesn't use — so it works within 1–3,999.
Where it helps
- Reading a year in film credits or a cornerstone (MCMXCIV = 1994)
- Writing a chapter, volume or edition number
- Understanding clock faces and monarch/pope names (Louis XIV, Elizabeth II)
Worked example
Convert 2024 to Roman numerals: 2,000 is MM, and 24 is XXIV (X + X + IV, where IV is the subtractive 4), giving MMXXIV. Going the other way, MCMXCIV reads as M (1,000) + CM (900) + XC (90) + IV (4) = 1994 — a common credits-year format. Notice the rules at work: 1994 is not MDCCCCLXXXXIIII; the subtractive forms CM, XC and IV keep it compact. And 4 is always IV, never IIII — a strict rule the converter enforces, rejecting invalid input like IIII.
Roman numerals table
| Number | Roman numeral |
|---|---|
| 1 | I |
| 2 | II |
| 3 | III |
| 4 | IV |
| 5 | V |
| 6 | VI |
| 7 | VII |
| 8 | VIII |
| 9 | IX |
| 10 | X |
| 11 | XI |
| 12 | XII |
| 14 | XIV |
| 19 | XIX |
| 20 | XX |
| 21 | XXI |
| 30 | XXX |
| 40 | XL |
| 50 | L |
| 90 | XC |
| 100 | C |
| 400 | CD |
| 500 | D |
| 900 | CM |
| 1000 | M |
| 1990 | MCMXC |
| 2000 | MM |
| 2024 | MMXXIV |
| 2025 | MMXXV |
| 2026 | MMXXVI |
Frequently asked questions
How do I convert a number to Roman numerals?+
Break it into thousands, hundreds, tens and units, and write each with the symbols, using subtraction for 4s and 9s. 2024 = MM + XX + IV = MMXXIV. The tool does it instantly.
How do I read a Roman numeral?+
Add the symbols left to right, but subtract when a smaller one precedes a larger one: MCMXCIV = 1,000 + 900 + 90 + 4 = 1994. Enter it and the tool returns the number.
Why is 4 written IV and not IIII?+
The subtraction rule: a smaller symbol before a larger one is subtracted, so IV = 5 − 1 = 4. A symbol repeats at most three times, so IIII is not valid standard form.
What is the largest Roman numeral?+
In standard notation, 3,999 (MMMCMXCIX). Larger numbers require overlines (a bar for ×1,000), which aren't used here — so this converter covers 1 to 3,999.
Is there a Roman numeral for zero?+
No — the Roman system has no symbol for zero. It represents positive whole numbers only, which is why the converter starts at 1.
What does MCMXCIV mean?+
It's 1994: M (1,000) + CM (900) + XC (90) + IV (4). It's a very common year format in film credits and copyright dates.
About this page
- Publisher:
- Kalkoro — Teknolojig Bilişim Teknolojileri A.Ş., İstanbul
- Written by:
- Ahmet Tur — Editor (Math, date & time, unit conversion, physics & chemistry, everyday tools)
- Reviewed by:
- Kübra Yıldız — Editor
Parameters come from official sources; the last update date is shown at the bottom of the page.
Spotted a wrong result? Use the "Report a bug" button at the top of the page; every report is reviewed.
How we calculate and our accuracy policy →
Results are for information only. For official matters the relevant authority's calculation prevails.
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