FREE · CALCULATORS & CONVERTERS
Roman Numeral Converter.
Convert integers and strict canonical Roman numerals.
How to use Roman Numeral Converter
Choose the operation, enter the required values and generate the result. Review units, calendar rules and assumptions before using it.
How it works
Convert integers and strict canonical Roman numerals. Canonical notation only, values 1–3,999. Lowercase numeral input is accepted.
Example
42 ↔ XLII
Questions about Roman Numeral Converter
Is Roman Numeral Converter free, and do I need an account?
Yes. This tool is free to use in your browser without an account. Processing takes place on your device.
What are the limits and what should I check?
Canonical notation only, values 1–3,999. Lowercase numeral input is accepted. Review the result before using it in your work.
Is my input sent to a server?
Your input is processed in your browser and is not uploaded by this tool. Files and pasted text are cleared when the page is refreshed. Normal website requests are still required to load the page and its libraries. Read the privacy explanation.