In this article
Roman numerals still show up everywhere — clock faces, movie copyright years, book chapters, Super Bowl numbers, school events, kings and queens. Reading them is easy once you know seven symbols and two rules.
The seven symbols
| Symbol | Value | Memory tip |
|---|---|---|
| I | 1 | One finger |
| V | 5 | The shape of an open hand |
| X | 10 | Two Vs joined at the tips |
| L | 50 | |
| C | 100 | Centum — as in century, cent |
| D | 500 | |
| M | 1000 | Mille — as in millennium |
A popular sentence for the order I, V, X, L, C, D, M: I Value Xylophones Like Cows Dig Milk.
Rule 1: add from largest to smallest
When symbols go from bigger to smaller, add them up:
- VI = 5 + 1 = 6
- XV = 10 + 5 = 15
- LXX = 50 + 10 + 10 = 70
- MDC = 1000 + 500 + 100 = 1600
A symbol can repeat up to three times: III = 3, XXX = 30, CCC = 300.
Rule 2: smaller before larger means subtract
To avoid writing four of the same symbol, a smaller symbol is placed before a larger one to subtract it. Only six combinations are used:
| Numeral | Value |
|---|---|
| IV | 4 (5 − 1) |
| IX | 9 (10 − 1) |
| XL | 40 (50 − 10) |
| XC | 90 (100 − 10) |
| CD | 400 (500 − 100) |
| CM | 900 (1000 − 100) |
Reading long numerals: chunk them
Split a long numeral into thousands, hundreds, tens and ones, then add.
MCMXCIV
M = 1000
CM = 900
XC = 90
IV = 4
Total = 1994
MMXXVI
MM = 2000
XX = 20
VI = 6
Total = 2026
Writing numbers as Roman numerals
Go place by place:
- Write the thousands with M.
- Write the hundreds (C, CC, CCC, CD, D, DC, DCC, DCCC, CM).
- Write the tens (X, XX, XXX, XL, L, LX, LXX, LXXX, XC).
- Write the ones (I, II, III, IV, V, VI, VII, VIII, IX).
So 1857 = M + DCCC + L + VII = MDCCCLVII.
Quick practice
Try these, then check below:
- XIV
- XLII
- XCIX
- CDXLIV
- MMXXX
Answers: 14, 42, 99, 444, 2030.
Fun facts
- There is no zero in Roman numerals.
- Many clock faces use IIII instead of IV, mostly for visual symmetry.
- The largest standard numeral is MMMCMXCIX (3999).
Convert instantly
Our Roman Numeral Converter works both ways — type a number from 1 to 3999 to see its Roman numeral, or type a Roman numeral to get the number. It also tells you if a numeral isn’t written correctly.
Free toolTry the Roman Numeral ConverterConvert between numbers and Roman numerals in either direction.Frequently asked questions
Why do some clocks show IIII instead of IV?
It's a long-standing clock-making tradition. Many watch and clock faces use IIII for visual balance with VIII on the opposite side, even though IV is the standard form.
How do you write 2026 in Roman numerals?
MMXXVI — two thousands (MM), two tens (XX), a five (V) and a one (I).
What is the largest standard Roman numeral?
MMMCMXCIX, which is 3999. Larger numbers traditionally used a bar over a numeral to multiply it by 1,000.
Written by the Toolsopedia team. Spotted an error? Tell us and we’ll fix it.