Convert numbers to Roman numerals and Roman numerals back to numbers (1–3999).. Roman Numeral Converter is a free online tool from the ToolsRift Math Calculators collection. It runs entirely in your browser — nothing to install, no signup, and your data never leaves your device.
Enter a number to get its Roman numeral, or enter a Roman numeral to convert it back to a number.
Standard Roman numerals cover 1 to 3999, the maximum representable without special overline notation.
I=1, V=5, X=10, L=50, C=100, D=500 and M=1000, combined using additive and subtractive rules.
A smaller symbol before a larger one subtracts, so IV is 4 and IX is 9 rather than IIII or VIIII.