Roman Numeral Converter
Convert numbers to Roman numerals and Roman numerals to numbers for free — it works both ways as you type, supports large numbers up to 3,999,999 with the overline for thousands, converts dates into Roman numerals for tattoos, engravings and invitations, and includes a quick reference table.
100% private — everything runs in your browser. Conversion happens on your device; nothing is uploaded.
Converts both ways automatically: type a number to get Roman numerals, or Roman numerals to get the number. Supports 1 to 3,999,999 using the overline (vinculum) for thousands, and dates for tattoos and engravings.
How to convert Roman numerals
- Type a number, a Roman numeral or a date (YYYY-MM-DD).
- Read the conversion instantly.
- Copy the result.
- Use the table for common values.
What you can use it for
- Write years for film credits, monuments and cornerstones
- Design tattoos and engravings with dates
- Number book chapters, outlines and events (Super Bowl LX)
- Check homework and puzzles
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See all free tools →Frequently asked questions
What is 2026 in Roman numerals?
MMXXVI — M (1000) + M (1000) + XX (20) + VI (6).
How are numbers over 3,999 written?
A bar (vinculum) over a letter multiplies it by 1,000 — for example V̅ is 5,000.
Why does it say my numeral is invalid?
Standard Roman numerals follow fixed rules — for example 4 is IV, not IIII, and 99 is XCIX, not IC.
How do I write a date in Roman numerals?
Type it as YYYY-MM-DD and each part is converted; many people then arrange it as day.month.year or month.day.year.