Convert decimal numbers to Roman numerals and back. Standard form (1–3999) plus vinculum notation for values up to 3,999,999.
| Symbol | Value | Notes |
|---|---|---|
| I | 1 | |
| V | 5 | |
| X | 10 | |
| L | 50 | |
| C | 100 | |
| D | 500 | |
| M | 1,000 | |
| V | 5,000 | vinculum — overlined |
| X | 10,000 | vinculum |
| L | 50,000 | vinculum |
| C | 100,000 | vinculum |
| D | 500,000 | vinculum |
| M | 1,000,000 | vinculum |
Subtractive form is used (IV=4, IX=9, XL=40, XC=90, CD=400, CM=900). Vinculum multiplies a symbol by 1,000 — here we use combining overline (U+0305) which renders as V.