How to use the Roman Numeral Converter
The Roman numeral converter changes numbers to Roman numerals and back.
Open the Roman Numeral Converter →
What you need to enter
- Number or Roman numeral
The formula
Symbols: I 1, V 5, X 10, L 50, C 100, D 500, M 1000. A smaller symbol before a larger one is subtracted.
Worked example
Using the default values in the calculator:
- Number or Roman numeral: 2026
| Roman numeral | MMXXVI |
Tips for better results
- Valid range is 1–3999.
- Repeat a symbol at most three times.
Common mistakes to avoid
- Writing IIII instead of IV.
- Out-of-range numbers.
Please note: Results are estimates for general use. For safety-critical work such as electrical or building projects, check with a qualified professional and local codes. See our Disclaimer.