Roman Numerals Converter
Convert between Roman numerals and standard numbers. Supports values from 1 to 3,999,999 with a quick reference chart.
Roman Numeral
MMXXVI
2026 in Roman numerals
Roman Numeral Symbols
| Symbol | Value | Latin Name |
|---|---|---|
| I | 1 | unum |
| V | 5 | quinque |
| X | 10 | decem |
| L | 50 | quΔ«nquΔgintΔ |
| C | 100 | centum |
| D | 500 | quingenti |
| M | 1,000 | mille |
Quick Reference
How to Convert
- Write symbols left to right in decreasing value order
- No symbol should be repeated four or more times (use IV, not IIII)
- A smaller symbol before a larger one means subtraction (IX = 9)
- A smaller symbol after a larger one means addition (XI = 11)
- Only I, X, and C can be used as subtractive prefixes
How to Use
- 1
Choose Number β Roman or Roman β Number mode
- 2
Enter a number (1β3,999,999) or Roman numeral string
- 3
View the instant conversion result
- 4
Browse the symbol table and quick reference chart below
- 5
Understanding the key inputs β Roman numerals use additive and subtractive notation with seven base symbols: I, V, X, L, C, D, M
- 6
Interpreting the results β the converter handles the standard subtractive pairs (IV, IX, XL, XC, CD, CM) and extended notation for numbers above 3,999
Examples
Good Examples
Year conversion
2026 β MMXXVIClassic Roman numeral
1999 β MCMXCIXReverse conversion
MCMLXIX β 1969Large number conversion
3,499 β MMMCDXCIXSmall number for learning
58 β LVIII (50 + 5 + 1 + 1 + 1)Bad Examples
Using IIII instead of IV
No symbol should repeat 4+ timesUsing MIM for 1999
Must be MCMXCIX β subtractive rules are strictUsing VL for 45
Must be XLV β V, L, and D can never be subtractedCommon Mistakes
- Repeating a symbol 4 or more times (IIII instead of IV)
- Using V, L, or D as subtractive prefixes
- Writing 1999 as MIM instead of MCMXCIX
- Forgetting that subtractive values must be at least 1/10 of the larger value
- Not knowing that Roman numerals have no zero β the system was designed for counting, not arithmetic
- Assuming Roman numerals can represent any number β the traditional system only goes up to 3,999,999 with overline notation
- Mixing subtractive and additive forms β you cannot write 99 as IC; it must be XCIX
Frequently Asked Questions
Why is there no zero in Roman numerals?
The Romans used numerals primarily for counting rather than calculation. Anything with zero value was not considered a number β it was expressed by the Latin word "nulla" (nothing).
What is the largest number in Roman numerals?
The standard system goes up to 3,999 (MMMCMXCIX). Larger numbers use the vinculum system β a bar over a numeral multiplies it by 1,000 (e.g., VΜ = 5,000, MΜ = 1,000,000).
Why is 1999 written as MCMXCIX and not MIM?
Roman numeral rules require that the subtractive value be at least 1/10 of the larger value, and each power of ten has its own group. So 1999 breaks down as M (1000) + CM (900) + XC (90) + IX (9).
Why do some clocks use IIII instead of IV?
While IV is the standard notation, IIII has a long historical tradition on clock faces. Some theories suggest it was for aesthetic symmetry (opposite VIII), or to honor the Roman god Jupiter (IVPPITER).
Roman numerals vs Arabic numerals β what is the difference?
Roman numerals use letters (I, V, X, L, C, D, M) in an additive and subtractive system, while Arabic numerals use digits (0-9) in a positional decimal system. Arabic numerals are far more practical for calculation and are the standard worldwide, while Roman numerals are used mainly for decorative, ceremonial, and traditional purposes.
How to convert numbers to Roman numerals step by step?
Break the number into thousands, hundreds, tens, and ones. Replace each group with its Roman numeral equivalent: thousands use M, hundreds use C/D/M, tens use X/L/C, and ones use I/V/X. Apply subtraction rules where a smaller value precedes a larger one, like IV for 4 or XC for 90.
What are the 7 basic Roman numeral symbols?
The 7 basic Roman numeral symbols are: I (1), V (5), X (10), L (50), C (100), D (500), and M (1,000). These symbols are combined using addition and subtraction rules to represent any number. A bar over a numeral multiplies it by 1,000 for larger numbers.
Where are Roman numerals still used today?
Roman numerals are still used for clock faces, book chapters, movie sequel numbers, Super Bowl numbering, royal and papal names (Queen Elizabeth II), building cornerstones, copyright dates on films, music theory chord progressions, and outlines in academic writing.
How do Roman numeral subtraction rules work?
A smaller symbol before a larger one means subtraction: IV equals 4 (5 minus 1), IX equals 9 (10 minus 1), XL equals 40 (50 minus 10), XC equals 90 (100 minus 10), CD equals 400 (500 minus 100), and CM equals 900 (1000 minus 100). Only I, X, and C can be used for subtraction.