Roman Numerals Converter
Convert between Roman numerals and Arabic numbers (1–3999)
Conversion:
Symbol reference
| Symbol | Value | Examples |
|---|---|---|
| I | 1 | II=2, III=3, IV=4 |
| V | 5 | VI=6, VII=7, IX=9 |
| X | 10 | XX=20, XL=40, XC=90 |
| L | 50 | LX=60, LXX=70 |
| C | 100 | CC=200, CD=400, CM=900 |
| D | 500 | DC=600, DCC=700 |
| M | 1000 | MM=2000, MMXXIV=2024 |
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Convert Roman numerals to Arabic numbers and back. Supports the full standard Roman range from I (1) to MMMCMXCIX (3999), plus a quick reference of the basic symbols (I, V, X, L, C, D, M).
How to convert Roman numerals
1
Pick direction
Number → Roman or Roman → Number.
2
Enter the value
Type a number (1–3999) or a Roman string (e.g. MCMLXXXIV).
3
Read the result
The conversion appears live as you type.
1 to 3999
Full standard Roman numeral range with both directions of conversion.
Symbol reference
Quick chart of basic and combination Roman symbols.
Validates input
Catches invalid Roman strings like IIII or VV with a clear error.
Copy result
One-click copy of the converted value.
FAQ
Standard Roman numerals go up to 3999 (MMMCMXCIX). Larger numbers required overlines, which aren't widely supported.
Roman numerals use subtractive notation — IV means 'one before five' (4), avoiding the older IIII style.
I=1, V=5, X=10, L=50, C=100, D=500, M=1000. Combinations follow subtractive (IV=4) and additive (VI=6) rules.
No. Romans had no symbol for zero or negative numbers — both are outside the system.
Years up to 3999 work. For real-world dates this covers everything you'll encounter (e.g. movie copyright dates).