The seven symbols
Roman numerals use seven letters, each with a fixed value:
| Symbol | Value |
|---|---|
| I | 1 |
| V | 5 |
| X | 10 |
| L | 50 |
| C | 100 |
| D | 500 |
| M | 1000 |
There is no symbol for zero and no place value as in our digits. A number is built by adding symbols together, with one important exception.
The rules
- Adding: when symbols go from large to small, add them up. VI = 5 + 1 = 6, LXX = 50 + 10 + 10 = 70.
- Repeating: I, X, C and M may appear up to three times in a row. III = 3, XXX = 30, MMM = 3000.
- Subtracting: when a smaller symbol comes before a larger one, subtract it. This is allowed only in six fixed pairs: IV (4), IX (9), XL (40), XC (90), CD (400) and CM (900).
- V, L and D are never repeated and never subtracted.
As a result, every number from 1 to 3999 has exactly one standard form.
Examples
- 2026 = MM (2000) + XX (20) + VI (6) = MMXXVI.
- 1984 = M (1000) + CM (900) + LXXX (80) + IV (4) = MCMLXXXIV.
- 49 = XL (40) + IX (9) = XLIX, not IL.
- 3999 = MMM + CM + XC + IX = MMMCMXCIX, the largest number in standard notation.
How to read a Roman numeral
Read from left to right. If a symbol is smaller than the one after it, subtract it; otherwise add it. For MCMXLV: M = 1000, CM = 900, XL = 40, V = 5, giving 1945. The converter shows these steps in the "Breakdown" line.
Where you see Roman numerals
- Years on buildings, monuments, gravestones and in film and TV credits.
- Clock faces. Notice that the 4 is often written IIII rather than IV, a long-standing tradition that, among other things, balances the VIII on the other side of the dial.
- Names of monarchs and popes, such as Elizabeth II or Louis XIV.
- Chapters and volumes of books, and the numbering of preface pages (i, ii, iii).
- Major events, such as the Super Bowl and the Olympic Games.
- Outlines and lists in legal documents and school essays.
Larger numbers
The Romans had ways to write larger numbers, such as a bar over a symbol (vinculum) to multiply it by 1000. That notation was never fully standardised and is rarely used today, so the converter sticks to the usual range of 1 to 3999.
Writing dates in Roman numerals
Roman numerals are popular for tattoos, wedding rings and anniversary gifts, often as a full date. Each part is converted separately: 14 July 2026 becomes XIV · VII · MMXXVI, and in the US order (7/14/2026) VII · XIV · MMXXVI. Separate the parts with dots, dashes or spaces so they can't be misread, and double-check the result before it is engraved or inked. Common mistakes are writing 4 as IIII, 9 as VIIII, 40 as XXXX or 1990 as MXM instead of MCMXC.
A short history
Roman numerals developed in ancient Rome and were used throughout Europe until the late Middle Ages. They were well suited to recording numbers but awkward for arithmetic, because there is no place value and no zero. From around the 13th century, Hindu-Arabic numerals (0 to 9), which spread to Europe via Arabic mathematicians, gradually replaced them for trade and science. Roman numerals survived for formal and decorative uses.
Frequently asked questions
How do you write 2026 in Roman numerals?
MMXXVI: MM = 2000, XX = 20 and VI = 6.
Why does my clock show IIII instead of IV?
It is an old tradition for clock faces. Standard notation writes 4 as IV, but IIII is very common on clocks.
What is the largest Roman numeral?
In standard notation MMMCMXCIX, or 3999. Larger numbers used other, less consistent notations.
Is there a Roman numeral for zero?
No. The Romans had no symbol for zero.
Why isn't 49 written as IL?
Subtraction is only allowed with I before V and X, X before L and C, and C before D and M. That is why 49 is XLIX.
Does upper or lower case matter?
No. Lower case (mcmxc) is read the same as upper case.
Last reviewed: 2026-10-06. Results are estimates for information only.