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Type a number or a Roman numeral — the other updates as you type. For example, 2026 = MMXXVI.
Seven letters carry values: I = 1, V = 5, X = 10, L = 50, C = 100, D = 500, M = 1000. Add them left to right, except when a smaller letter comes before a larger one — then subtract it (IV = 4, IX = 9, XL = 40, XC = 90, CD = 400, CM = 900). A letter repeats at most three times.
Example: 1994 = 1000 (M) + 900 (CM) + 90 (XC) + 4 (IV) = MCMXCIV.
| Number | Roman | Number | Roman |
|---|---|---|---|
| 1 | I | 20 | XX |
| 2 | II | 30 | XXX |
| 3 | III | 40 | XL |
| 4 | IV | 50 | L |
| 5 | V | 90 | XC |
| 6 | VI | 100 | C |
| 7 | VII | 400 | CD |
| 8 | VIII | 500 | D |
| 9 | IX | 900 | CM |
| 10 | X | 1000 | M |
| Year | Roman numerals |
|---|---|
| 1900 | MCM |
| 1990 | MCMXC |
| 2000 | MM |
| 2010 | MMX |
| 2020 | MMXX |
| 2024 | MMXXIV |
| 2025 | MMXXV |
| 2026 | MMXXVI |
| 2027 | MMXXVII |
| 2030 | MMXXX |
| 2050 | MML |
MMXXVI: MM (2000) + XX (20) + VI (6).
No. Roman numerals have no zero, which is why converters start at 1.
Standard notation only allows M three times, so MMMCMXCIX (3999) is the largest. Larger numbers used a bar over letters to multiply by 1,000, which isn't standardised.
IV is the standard form of 4, but IIII appears on many clock faces. The converter flags non-standard forms and suggests the standard one.
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