Roman Numerals Converter
Roman Numerals Converter: free, instant and private. Only I, V, X, L, C, D and M are used, and a smaller symbol before a larger one subtracts (IV is 4, not 6).
How the Roman Numerals Converter works
The Roman Numerals Converter takes Number (1–3999) or Roman string and returns the answer instantly — no button to hunt for, no page reload. Only I, V, X, L, C, D and M are used, and a smaller symbol before a larger one subtracts (IV is 4, not 6). Values above 3999 need the overline notation, which this converter does not use.
Enter your own numbers to replace the example values; the result panel updates as you type. Everything runs in this single page, so nothing you enter leaves your device.
Formula used
roman numeral = subtractive notation, largest symbols first
| Symbol | Meaning |
|---|---|
| value | a number from 1 to 3999, or a Roman string to convert back |
Only I, V, X, L, C, D and M are used, and a smaller symbol before a larger one subtracts (IV is 4, not 6). Values above 3999 need the overline notation, which this converter does not use.
Inputs used: Number (1–3999) or Roman string.
Worked example
Take the default example — number (1–3999) or roman string of 2026:
- Roman numeral: MMXXVI
- Number: 2026
Frequently asked questions
- What formula does the Roman Numerals Converter use?
- It uses roman numeral = subtractive notation, largest symbols first, where value is the a number from 1 to 3999, or a Roman string to convert back.
- Is the Roman Numerals Converter free?
- Yes. There is no signup, no usage limit and no watermark — the converter runs entirely in your browser.
- How do I read the result?
- Only I, V, X, L, C, D and M are used, and a smaller symbol before a larger one subtracts (IV is 4, not 6). Values above 3999 need the overline notation, which this converter does not use.
- Does the Roman Numerals Converter store or send my data?
- No. Every calculation happens locally in the page, so the numbers you type are never uploaded or logged.
- Does it work on a phone and offline?
- Yes — the page is a single lightweight file that adapts to any screen size. Once it has loaded it keeps working without a network connection.