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Convert numbers and calendar dates to Roman numerals with instant reverse conversion.
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Enter a number to get its Roman numeral output.
Enter Roman numerals to decode into numeric form.
Use the date controls to format birthdays or events in Roman notation.
Copy output for documentation, design, or print use.
Converting years for design and branding
Formatting memorable dates
Educational practice
Verifying Roman numeral strings
Roman numerals are still used in publishing, clocks, events, and stylistic date representation. This converter simplifies both forward and reverse conversion so you can validate values quickly.
For date formatting, keep separators consistent so Roman date strings remain readable.
Convert a date to Roman numerals for tattoos, jewelry, or memorabilia
Enter a number (1 to 3,999,999)
Enter Roman numerals (e.g. XLII, XII·XXV·MCMXC)
Enter a valid Roman numeral or date (e.g. XII · XXV · MCMXC)