About this tool
Convert numbers to Roman numerals and back, with validation of the Roman form.
Values are built from M, CM, D, CD, C, XC, L, XL, X, IX, V, IV and I, largest first. A Roman input is accepted only if it is written in this standard form.
Formula: MMXXVI = 2026
Example: What do you want to calculate? = Number → Roman, Number = 1,994 → Roman numeral = MCMXCIV.
Standard Roman numerals cover 1 to 3999.
Quick steps
- Enter your values — every field shows its unit.
- Press Calculate (or Try an example to see how it works).
- Read the results and copy them if you need them elsewhere.
The calculation runs in your browser. Nothing you type is sent to 1CLIK.
FAQ
How does the Roman Numeral Converter work?
Values are built from M, CM, D, CD, C, XC, L, XL, X, IX, V, IV and I, largest first. A Roman input is accepted only if it is written in this standard form.
What should I keep in mind?
Standard Roman numerals cover 1 to 3999.
Is my data sent anywhere?
No. The numbers stay on your device; the page only shows the result.