Roman Numerals Converter
Convert Arabic numbers to Roman numerals and Roman numerals back to numbers. Validates the input and supports values from 1 to 3999.
Result
MMXXVI
Frequently asked questions
What is the largest Roman numeral?
In classical notation — 3999 (MMMCMXCIX). Larger numbers require vinculum (overline) notation, which the converter does not support.
Is there a zero in Roman numerals?
No — ancient Romans had no symbol for zero. The concept came much later from Indian mathematics.
Why is my input rejected?
The converter accepts only canonical Roman numerals: letters M, D, C, L, X, V, I in valid order, so IIII or IC are rejected as non-canonical.