Roman Numeral Converter
Convert numbers to Roman numerals and back, with each symbol explained. Your work stays on this device whenever possible.
How to use Roman Numeral Converter
- Type a number from 1 to 3999, or a Roman numeral such as MCMXCIV.
- The result updates as you type; press Convert if you prefer.
- Read the breakdown line to see which symbols make up the answer.
- Press "Copy result" to copy just the converted value.
What Roman Numeral Converter does
Convert numbers to Roman numerals and back, with each symbol explained.
The calculation runs in browser JavaScript from the displayed inputs. No financial, health, or personal values are submitted to ToolkitPoint. For Roman Numeral Converter, the operation is specifically to convert numbers to Roman numerals and back, with each symbol explained.
Worked example
Type 1994 and the result is 1994 = MCMXCIV, built from M = 1000, CM = 900, XC = 90 and IV = 4. Typing MCMXCIV back in returns 1994 with the same symbols listed.
When Roman Numeral Converter is the right tool
- Writing a year on a tattoo, invitation or film credit.
- Checking chapter, outline or clock numbering for homework.
How to verify the result
Change one input and confirm the result moves in the direction you expect. For money, also reproduce one simple case by hand. The final Roman Numeral Converter output should visibly match this goal: Convert numbers to Roman numerals and back, with each symbol explained.
Important limitations
Covers standard numerals from 1 to 3999 in subtractive form; forms such as IIII and the overline notation for larger numbers are not supported.
A free Roman Numeral Converter alternative
People looking for Roman Numeral Converter often compare products such as Calculator.net, WolframAlpha. ToolkitPoint is not affiliated with those services. This page keeps convert numbers to roman numerals and back, with each symbol explained free and available without an account; features, limits, and policies on other products can change, so compare their current product pages before choosing.
Last updated: September 15, 2026
Frequently asked questions
Why only up to 3999?
Standard Roman numerals have no single symbol above M (1000), and writing 4000 would need MMMM, which breaks the rule of at most three repeats. Larger values used a bar over letters, which plain text cannot show reliably.
Why is IIII rejected?
The converter uses the standard subtractive form, where 4 is IV and 9 is IX. IIII appears on some clock faces, but it is not the accepted modern form, so the tool flags it rather than guessing.
Can I type lowercase letters?
Yes. mcmxciv and MCMXCIV give the same answer; the result is shown in capitals.
How do I write a year like 2026?
Break it into thousands, hundreds, tens and ones: MM for 2000, XX for 20 and VI for 6, giving MMXXVI. The breakdown line shows the same steps.
Is there a Roman numeral for zero?
No. The Roman system had no zero, so 0 cannot be converted.