Roman Numeral Converter
Convert numbers to Roman numerals and back · free, no signup
Quick reference
Free Roman Numeral Converter
Roman numerals still appear on clocks, book chapters, movie sequels, Super Bowls and monuments. Enter a number to get its Roman numeral, or type a numeral such as MCMXCIV to get the number.
The converter follows the standard subtractive rules (IV, IX, XL, XC, CD, CM) and validates input, so an invalid numeral like IIII or VX is flagged instead of guessed.
Two-way conversion
Numbers to numerals and numerals to numbers.
Rule-checked
Rejects invalid numerals.
Big values
Up to 3,999,999 using overlines (vinculum).
Quick reference
Symbol table included.
How to use it
- Type a number or a Roman numeral.
- Read the converted result.
- Use the reference chart to learn the pattern.
Frequently asked questions
What is 2024 in Roman numerals?
MMXXIV.
Why isn't 4 written IIII?
The standard subtractive form is IV, although IIII appears on some clock faces.
Is there a Roman numeral for zero?
No. The Romans had no symbol for zero.
What is the largest Roman numeral?
Classically 3,999 (MMMCMXCIX). Overlines multiply a symbol by 1,000 for larger values.