Free Roman Numeral Converter
Clock faces, book chapters, Super Bowls and movie sequels still speak in Roman numerals. This free converter works both ways: type 2026 to get MMXXVI, or paste MMXXVI to get 2026 — with a symbol-by-symbol breakdown showing exactly how it works.
Roman numeral reference
| Symbol | Value | Symbol | Value |
|---|---|---|---|
| I | 1 | IV | 4 |
| V | 5 | IX | 9 |
| X | 10 | XL | 40 |
| L | 50 | XC | 90 |
| C | 100 | CD | 400 |
| D | 500 | CM | 900 |
| M | 1000 |
How to Use the Roman Numeral Converter
- Type a number or a Roman numeral — the converter detects the direction automatically.
- Watch the result appear instantly; invalid numerals are flagged, not misconverted.
- Check the symbol breakdown to see exactly how the value is built.
- Use the reference table below for quick lookups of every symbol.
Features
Bidirectional conversion with automatic direction detection, full validation of numeral rules (no IIII or VX), symbol breakdown tables, and a complete reference chart.
Benefits & Use Cases
Students learning the system, designers setting clock faces or tattoos, writers numbering chapters, and trivia fans decoding Super Bowl numbers all get verified answers. Invalid numerals are rejected with an explanation, not a wrong answer.
Tips
Remember the subtraction rule: I, X and C go before larger values (IV = 4, IX = 9, XL = 40). Symbols never repeat more than three times — that is why 4 is IV, not IIII.
Frequently Asked Questions
What is 2026 in Roman numerals?
MMXXVI — that is 1000 + 1000 + 10 + 10 + 5 + 1.
How do Roman numerals work?
Letters stand for values (I=1, V=5, X=10, L=50, C=100, D=500, M=1000). A smaller value before a larger one subtracts: IV = 4, IX = 9, XL = 40.
What is the largest standard Roman numeral?
3,999 (MMMCMXCIX) in the standard system without overline notation.
Why is 4 written as IV instead of IIII?
Subtractive notation: placing I before V means 5 − 1. It became standard because it is shorter and less ambiguous.
Can I convert MMXXVI back to a number?
Yes — just type it in and the converter detects the direction automatically: MMXXVI = 2026.
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