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Roman numerals converter

Roman numerals converter

MMXXVI

Convert between Arabic numbers and Roman numerals (range 1–3999).

This Roman numerals converter translates Arabic numbers into Roman numerals and Roman numerals back into numbers, updating as you type. Useful for clocks, book chapters, film credits and dates.

Both directions, instantly

Switch the conversion direction, enter a value (1–3999) and read the result. Everything is calculated in your browser.

FAQ

How do Roman numerals work?
They combine the letters I (1), V (5), X (10), L (50), C (100), D (500) and M (1000). Smaller values before a larger one are subtracted: IV is 4, IX is 9, XL is 40.
Why does it stop at 3999?
Standard Roman numerals only go up to 3999 (MMMCMXCIX). Larger numbers need an overline notation that isn't part of the everyday system.
Is there a year zero in Roman numerals?
No. The Romans had no symbol for zero, so the system starts at I (1).