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Roman Numeral Converter.

Convert between numbers and Roman numerals (I, V, X, L, C, D, M)

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Roman Numeral Guide:

I
1
V
5
X
10
L
50
C
100
D
500
M
1000

How to Use

Roman Numeral Conversion Rules

  • I = 1, V = 5, X = 10, L = 50, C = 100, D = 500, M = 1000
  • When a smaller value appears before a larger value, subtract it (IV = 4)
  • When a smaller value appears after a larger value, add it (VI = 6)

FAQs

How do you convert numbers to Roman numerals?

Start with the largest Roman numeral values (M=1000, D=500, etc.) and subtract them from your number, adding the symbols as you go.

What is the largest number in Roman numerals?

Using standard notation, 3999 (MMMCMXCIX) is the largest. For larger numbers, a bar above the numeral multiplies it by 1000.

How to Use the Roman Numeral Converter

Convert between Arabic numbers and Roman numerals in either direction.

  1. Enter a number (1–3999) or a Roman numeral.
  2. See the converted result instantly.

Roman Numeral Values

Symbol Values

I=1, V=5, X=10, L=50, C=100, D=500, M=1000

Symbols are added left to right, with subtractive pairs (IV=4, IX=9).

Example:

Input: 2024

Calculation: MM + XX + IV

Result: MMXXIV

Real-World Use Cases

Dates & Titles

Read clock faces, movie copyright years, and monarch names.

Outlines

Number sections in formal documents.

Tips

Tips

  • A smaller symbol before a larger one means subtract (IV = 4).
  • Standard Roman numerals cap at 3999.