Enter a number or a Roman numeral — the conversion appears instantly, with a place-value breakdown. The tricky subtractive pairs (IV, IX, XL …) are highlighted.
Press the button, then choose “Save as PDF” in the print dialog
Examples
The rules in brief.Additive: equal or smaller symbols on the right are added (VI = 6, XV = 15). Subtractive: a smaller symbol on the left is subtracted (IV = 4, IX = 9, XL = 40, XC = 90, CD = 400, CM = 900). No symbol repeats more than three times — 4 is IV, not IIII. Classic range: I – MMMCMXCIX (1 – 3999).