Roman Numerals: How to Read and Write Them
Seven letters that count
Roman numerals write numbers using seven letters, each with a fixed value. The system is additive: you write the symbols from largest to smallest and add them up. There is no symbol for zero and no place value — XXX does not mean three hundred, it means 10 + 10 + 10 = 30.
Rome used these numerals for records and commerce for centuries, and the system outlived the empire. You still read it on clock faces, book chapters, film credits and sporting events, so decoding it quickly remains a genuinely useful trick.
The seven symbols
Everything is built from seven values. Two handy anchors: the letters roughly double and half their way up (V is half of X, L is half of C, D is half of M), and M comes from mille, the Latin word for a thousand. For very large numbers, later writers drew a horizontal bar over a symbol to multiply its value by 1000 — a V with a bar meant 5000 — but that convention appears almost only in old inscriptions and is worth knowing just in case you meet it.
| Symbol | Value |
|---|---|
| I | 1 |
| V | 5 |
| X | 10 |
| L | 50 |
| C | 100 |
| D | 500 |
| M | 1000 |
The two rules: when to add and when to subtract
Additive rule: when a symbol is followed by one of equal or smaller value, you add. VIII = 5 + 1 + 1 + 1 = 8. LX = 50 + 10 = 60. MMXXVI = 1000 + 1000 + 10 + 10 + 5 + 1 = 2026.
Subtractive rule: when a smaller symbol sits before a larger one, it subtracts. This exists to keep numerals short: 4 is IV instead of IIII, 40 is XL instead of XXXX. But the shortcut is tightly restricted — only I, X and C may subtract, and each one only from the next two larger symbols. So I subtracts only from V and X, X subtracts only from L and C, and C subtracts only from D and M. V, L and D never subtract from anything, which is why 45 is XLV and not VL.
The six subtractive pairs you will ever need are these:
| Pair | Value | How to read it |
|---|---|---|
| IV | 4 | 1 before 5 |
| IX | 9 | 1 before 10 |
| XL | 40 | 10 before 50 |
| XC | 90 | 10 before 100 |
| CD | 400 | 100 before 500 |
| CM | 900 | 100 before 1000 |
Reading a long numeral step by step
The trick with long numerals is to scan left to right and group them as you go: start a new group every time a symbol is smaller than the one after it. Each group is either a single large symbol or one subtractive pair, then you just add the group values.
MCMXCIV = 1994
Scan for smaller-before-larger pairs and split the numeral into groups: M | CM | XC | IV. Now add the groups: 1000 + 900 + 90 + 4 = 1994.
This numeral shows up in the copyright line of films and TV episodes from 1994, so it is one of the most-seen long numerals in daily life.
MCMXCIV = 1000 + 900 + 90 + 4 = 1994
Writing 2026
Take the largest symbol that fits, subtract, repeat. 2026 starts with MM (2000), leaving 26. The 26 is XX (20) plus VI (6).
Result: MMXXVI — and reading it back confirms it: 1000 + 1000 + 10 + 10 + 5 + 1 = 2026.
2026 = MMXXVI
Writing 87
Largest symbol that fits is L (50), leaving 37. Then X (10) three times covers 30, leaving 7, which is V + I + I.
So 87 = LXXXVII. Check it back: 50 + 10 + 10 + 10 + 5 + 1 + 1 = 87.
87 = LXXXVII
Writing 1969
Break the number into chunks that match legal symbols or pairs: 1969 = 1000 + 900 + 60 + 9. Each chunk converts directly: M (1000), CM (900), LX (60), IX (9).
Reading it back with the grouping trick confirms it: M | CM | LX | IX = 1000 + 900 + 60 + 9.
1969 = MCMLXIX
Numbers you will actually meet
Between 1 and 10 you see the whole system in miniature, including both subtractive pairs that involve single digits. The years below cover most anniversary and copyright reading you will do in this decade.
| Number | Roman numeral |
|---|---|
| 1 | I |
| 2 | II |
| 3 | III |
| 4 | IV |
| 5 | V |
| 6 | VI |
| 7 | VII |
| 8 | VIII |
| 9 | IX |
| 10 | X |
| 1969 | MCMLXIX |
| 2024 | MMXXIV |
| 2026 | MMXXVI |
Where Roman numerals still appear
Clocks and watches: the hours 1 to 12 are often Roman, and many dials write IIII instead of IV — a convention with no settled explanation, kept purely by tradition.
Books: chapters are numbered I, II, III, and the preface pages usually carry lowercase roman numerals (i, ii, iii) to separate front matter from the main text.
Films and games: sequels love Roman numerals — Rocky II, Final Fantasy VII — and the copyright year in the credits is often Roman too, like © MMXXVI.
Sports and royalty: each Super Bowl is numbered in Roman numerals — the 60th edition, played in 2026, was Super Bowl LX — and monarchs and popes carry them in their names, like Elizabeth II and Louis XIV.
The system eventually lost to Hindu-Arabic digits for one simple reason: try multiplying XLVII by XXIII by hand. Without place value and zero, written arithmetic is torture — the Romans themselves calculated on an abacus and used the numerals only to record the result.