The seven symbols
| Symbol | Value | Origin |
|---|---|---|
| I | 1 | One finger/tally |
| V | 5 | Hand (V shape of thumb and fingers) |
| X | 10 | Two V's (two hands) |
| L | 50 | Half of C (100) |
| C | 100 | Centum (Latin for 100) |
| D | 500 | Half of M (1000) |
| M | 1000 | Mille (Latin for 1000) |
The additive and subtractive rules
Roman numerals are generally written largest to smallest, left to right, and you add the values:
- VIII = 5 + 1 + 1 + 1 = 8
- XVII = 10 + 5 + 1 + 1 = 17
- CXXX = 100 + 10 + 10 + 10 = 130
The subtractive notation rule: when a smaller symbol appears before a larger one, subtract it. Only six specific subtractive combinations are valid:
- IV = 4 (not IIII)
- IX = 9 (not VIIII)
- XL = 40 (not XXXX)
- XC = 90 (not LXXXX)
- CD = 400 (not CCCC)
- CM = 900 (not DCCCC)
Combinations outside these six are not valid — IIX (trying to write 8) or VX (trying to write 5) are incorrect. Only one smaller symbol can precede a larger one in a subtractive pair.
Common values reference
| Number | Roman | Number | Roman |
|---|---|---|---|
| 4 | IV | 40 | XL |
| 9 | IX | 90 | XC |
| 14 | XIV | 400 | CD |
| 19 | XIX | 500 | D |
| 24 | XXIV | 900 | CM |
| 29 | XXIX | 1000 | M |
| Super Bowl LVIII | 58 | MMXXVI | 2026 |
Where Roman numerals appear today
- Super Bowl. The NFL uses Roman numerals for Super Bowl numbers — Super Bowl LVIII was played in February 2024 (58th Super Bowl). The NFL skipped Roman numerals for Super Bowl 50 because "L" looked awkward as branding.
- Copyright years. Credits in movies, TV shows, and books often display the copyright year as Roman numerals — a tradition meant to obscure the production date (no longer effective given the internet, but the tradition persists).
- Clock faces. Analog clocks and watches frequently use Roman numerals. Note: on most clocks, 4 o'clock is written as IIII (additive), not IV (subtractive) — this is a historical convention for clock aesthetics, not standard Roman numeral notation.
- Royalty and papal names. King Charles III, Pope John Paul II — sequential numbering with Roman numerals is standard for monarchs and popes sharing a name.
- Outlines and lists. Formal outlines use Roman numerals for top-level sections (I, II, III) with capital letters for subsections (A, B, C).
- Building cornerstones and public art. The year of construction on buildings, bridges, and monuments is often inscribed in Roman numerals.
Converting large numbers
Standard Roman numerals top out at 3,999 (MMMCMXCIX). Ancient Romans handled larger numbers with overbars (a bar over a numeral multiplied it by 1,000) or vinculum notation — but these aren't in common use today.
For any number conversion — year, sequence number, or any integer — use the free Roman numeral converter. It converts both directions (number to Roman and Roman to number) instantly.
Related tools
- Free Roman Numeral Converter — convert any number to Roman numerals and back
Written by Achraf A., founder of TheFreeAITools.