Roman Numeral Converter
Enter a number to get the Roman numeral (e.g. 2026 = MMXXVI), or enter a Roman numeral to get the number — instant in both directions.
How to use — Roman Numeral Converter
- Enter a number (1 to 3999) — the Roman numeral appears instantly.
- Or enter a Roman numeral (like XIV) — get its number.
- Both directions update live.
FAQ
How do Roman numerals work?
I=1, V=5, X=10, L=50, C=100, D=500, M=1000. When a smaller symbol comes before a larger one, it subtracts: IV=4, IX=9, XL=40, CM=900. All numbers are built this way.
Why only up to 3999?
In the standard Roman system, a symbol repeats at most 3 times, so MMMCMXCIX (3999) is the largest standard number. For larger numbers, Romans used a vinculum (a line), which isn't typable.
What is the Roman numeral for zero?
There isn't one! The Roman system had no concept of zero — that came from India (Aryabhata/Brahmagupta). That's why the converter starts at 1.
Is IIII wrong, or IV?
The standard rule is IV (5−1). But clock faces traditionally use IIII — both have been used historically; today IV is standard.