Roman Numeral to Number Converter
Convert between Roman numerals and Arabic numbers instantly
Result:
Result:
Roman Numeral Symbols
I
1
V
5
X
10
L
50
C
100
D
500
M
1,000
Popular Conversions
4
IV
9
IX
14
XIV
19
XIX
49
XLIX
99
XCIX
444
CDXLIV
1776
MDCCLXXVI
1984
MCMLXXXIV
1999
MCMXCIX
2000
MM
2024
MMXXIV
Complete Conversion Chart
| Number | Roman Numeral | Calculation |
|---|---|---|
| 1 | I | 1 |
| 2 | II | 1+1 |
| 3 | III | 1+1+1 |
| 4 | IV | 5-1 |
| 5 | V | 5 |
| 6 | VI | 5+1 |
| 7 | VII | 5+1+1 |
| 8 | VIII | 5+1+1+1 |
| 9 | IX | 10-1 |
| 10 | X | 10 |
| 11 | XI | 10+1 |
| 14 | XIV | 10+5-1 |
| 15 | XV | 10+5 |
| 19 | XIX | 10+10-1 |
| 20 | XX | 10+10 |
| 24 | XXIV | 10+10+5-1 |
| 40 | XL | 50-10 |
| 49 | XLIX | 50-10+10-1 |
| 50 | L | 50 |
| 90 | XC | 100-10 |
| 99 | XCIX | 100-10+10-1 |
| 100 | C | 100 |
| 400 | CD | 500-100 |
| 500 | D | 500 |
| 900 | CM | 1000-100 |
| 1,000 | M | 1000 |
| 1,994 | MCMXCIV | 1000+1000-100+100-10+5-1 |
| 2,024 | MMXXIV | 1000+1000+10+10+5-1 |
| 3,999 | MMMCMXCIX | 1000+1000+1000+1000-100+100-10+10-1 |
How to Read Roman Numerals
Addition Rule
When a smaller or equal numeral appears after a larger one, add their values together.
VI = 5 + 1 = 6
XII = 10 + 1 + 1 = 12
LXV = 50 + 10 + 5 = 65
Subtraction Rule
When a smaller numeral appears before a larger one, subtract the smaller from the larger.
IV = 5 – 1 = 4
IX = 10 – 1 = 9
XL = 50 – 10 = 40
CD = 500 – 100 = 400
Repetition Rules
- I, X, C, and M can be repeated up to three times consecutively
- V, L, and D can never be repeated
- Examples: III = 3, XXX = 30, CCC = 300
Subtraction Limitations
- I can only be subtracted from V and X
- X can only be subtracted from L and C
- C can only be subtracted from D and M
- V, L, and D cannot be subtracted
Large Numbers (Vinculum)
A line over a Roman numeral multiplies its value by 1,000. For example:
V̅ = 5 × 1,000 = 5,000
X̅ = 10 × 1,000 = 10,000
L̅ = 50 × 1,000 = 50,000
Conversion Examples
Example 1: Convert MCMXC to Number
Roman Numeral: MCMXC
Step-by-step breakdown:
M = 1000
CM = 1000 – 100 = 900
XC = 100 – 10 = 90
Total: 1000 + 900 + 90 = 1990
Answer: 1990
Example 2: Convert 2024 to Roman Numerals
Number: 2024
Step-by-step breakdown:
2024 = 2000 + 20 + 4
2000 = MM
20 = XX
4 = IV
Combine: MM + XX + IV = MMXXIV
Answer: MMXXIV
Example 3: Convert CDXLIV to Number
Roman Numeral: CDXLIV
Step-by-step breakdown:
CD = 500 – 100 = 400
XL = 50 – 10 = 40
IV = 5 – 1 = 4
Total: 400 + 40 + 4 = 444
Answer: 444
Example 4: Convert 888 to Roman Numerals
Number: 888
Step-by-step breakdown:
888 = 800 + 80 + 8
800 = DCCC (500 + 100 + 100 + 100)
80 = LXXX (50 + 10 + 10 + 10)
8 = VIII (5 + 1 + 1 + 1)
Combine: DCCC + LXXX + VIII = DCCCLXXXVIII
Answer: DCCCLXXXVIII
Common Uses of Roman Numerals
- Clock Faces: Traditional analog clocks often use Roman numerals for hours
- Book Chapters: Prefaces, introductions, and chapters are numbered with Roman numerals
- Movie Sequels: Rocky II, Star Wars Episode IV, etc.
- Monarchs and Popes: Queen Elizabeth II, Pope John Paul II
- Super Bowl: Super Bowl LVIII (58)
- Olympics: XXXIII Olympic Games (33rd Olympics)
- Building Cornerstones: Year of construction displayed in Roman numerals
- Outlines: Main points (I, II, III) and subpoints (i, ii, iii)
- Copyright Years: Film and television production dates
Frequently Asked Questions
What is the Roman numeral for 0?
Roman numerals do not have a symbol for zero. The ancient Romans had no concept of zero in their number system. Zero was introduced to Europe much later through Arabic numerals.
What is the largest Roman numeral?
The largest standard Roman numeral is M (1,000). Using the vinculum notation (overline), you can represent much larger numbers. For instance, M̅ equals 1,000,000. The maximum value this converter supports is 3,999,999 (M̅M̅M̅C̅M̅X̅C̅I̅X̅CMXCIX).
Why is 4 written as IV and not IIII?
The subtractive notation (IV for 4) is the standard modern convention. However, you may still see IIII on some clock faces and monuments. Both forms have historical precedent, but IV is now the accepted standard in most contexts.
Can Roman numerals represent decimals or fractions?
Standard Roman numerals only represent whole numbers. The ancient Romans used different symbols for fractions (like S for 1/2 and • for 1/12), but these are not commonly used today and are not part of the modern Roman numeral system.
How do you write 1999 in Roman numerals?
1999 is written as MCMXCIX. Breaking it down: M (1000) + CM (900) + XC (90) + IX (9) = 1999.
Are there lowercase Roman numerals?
Yes, lowercase Roman numerals (i, ii, iii, iv, v, etc.) are commonly used in outlines, lists, and numbering subsections. They follow the same rules as uppercase Roman numerals but are typically used for less prominent items.
What year is MMXXV?
MMXXV represents the year 2025. Breaking it down: MM (2000) + XX (20) + V (5) = 2025.
Why do we still use Roman numerals today?
Roman numerals continue to be used for traditional and aesthetic purposes. They convey formality, timelessness, and historical connection. They’re particularly useful when you want to distinguish special numbering from regular Arabic numerals in the same context.
What is the difference between Roman numerals and Arabic numerals?
Roman numerals (I, V, X, L, C, D, M) are based on combinations of letters from the Latin alphabet, while Arabic numerals (0, 1, 2, 3, 4, 5, 6, 7, 8, 9) use positional notation with a base of 10. Arabic numerals are more efficient for calculations and include a symbol for zero.
Historical Context: Roman numerals originated in ancient Rome around 500 BCE and remained the dominant number system in Europe until the 14th century when Arabic numerals began to replace them for mathematical calculations.