Convert an integer between decimal, binary, octal and hexadecimal
Roman Numeral Converter
Runs locally
Use Roman Numeral Converter
What it does
Convert a number between 1 and 3999 into standard Roman numerals, or type a Roman numeral to get its value.
It runs entirely in your browser: nothing you enter is uploaded.
Example
The year 1994
1994MCMXCIV→ Roman gives MCMXCIV (M + CM + XC + IV).
FAQ
Why only 1 to 3999?
Standard Roman numerals have no zero and no symbol above M (1000), so 4000 and up would need overline notation, which the tool does not produce. Fractions are dropped: 12.7 becomes XII.
Does Roman to Arabic check that a numeral is valid?
No. It adds and subtracts letter values from left to right, so non-standard forms such as IIII (4) or IC (99) are accepted, and a letter other than I, V, X, L, C, D or M gives NaN.
Is anything sent?
No. Both conversions run in your browser.