Roman Numerals to Number
Read standard Roman numerals from I through MMMCMXCIX.
Make this result useful
Use it now, or keep a copy for later. We never save your tool input automatically.
How to use this tool
Enter a Roman numeral using I, V, X, L, C, D and M, then select Convert.
Important to know
Read standard Roman numerals from I through MMMCMXCIX.
Nonstandard repetitions and subtractive combinations are rejected; letter case is ignored.
Formula and methodology
Parse numeral groups, then convert the result back to Roman notation to verify the original form.
Example
MMXXVI becomes 2026.
Frequently asked questions
Is IC a valid way to write 99?
No. In standard notation 99 is XCIX.