Convert integers and strictly validated canonical Roman numerals from 1 to 3999 with an interactive subtractive-symbol breakdown.
01 / PURPOSE-SPECIFIC INPUTS
02 / RESULT & INTERACTIVE INSPECTION
This tool uses conventional modern notation from 1 to 3999. Historical variants, overlines, batch conversion, Roman arithmetic and date-format conversion are outside its scope.
M contributes 1000. Cumulative prefix through this token: M = 1000; full numeral MCMXCIV = 1994.
| Symbol | Value |
|---|---|
| M | 1000 |
| CM | 900 |
| D | 500 |
| CD | 400 |
| C | 100 |
| XC | 90 |
| L | 50 |
| XL | 40 |
| X | 10 |
| IX | 9 |
| V | 5 |
| IV | 4 |
| I | 1 |
Enter your values locally; no inputs are uploaded.
Check validation feedback before reviewing the browser-generated result.
Review the explanation, copy supported outputs or reset the workspace.
Canonical modern notation from 1 to 3999, or I through MMMCMXCIX. Zero, negatives, fractions, extended overlines and historical variants are outside this convention.
Convert integers and strictly validated canonical Roman numerals from 1 to 3999 with an interactive subtractive-symbol breakdown. Inspect the calculated data through labeled controls and review worked assumptions before using a result.
Roman Numeral Converter calculations run locally in browser memory. Entered financial values, wages, measurements and other inputs are not sent to a third-party processing service or saved as a personal profile. Ordinary website page requests may still be logged. Clipboard access happens only when you choose Copy Result.
Canonical modern notation from 1 to 3999, or I through MMMCMXCIX. Zero, negatives, fractions, extended overlines and historical variants are outside this convention.
1994 is MCMXCIV: M contributes 1000, CM contributes 900, XC contributes 90 and IV contributes 4. The reverse direction returns 1994.
The supported canonical pairs are IV, IX, XL, XC, CD and CM. Forms such as IL, IC, VX or repeated subtractive groups are not silently summed into a value.
The numeral must match canonical thousands, hundreds, tens and ones groups and reproduce itself after conversion back from its integer. Repeated V/L/D, excessive repeats and malformed ordering fail validation.
Lowercase letters are normalized to uppercase, and leading/trailing whitespace is trimmed. Internal spaces, unrelated letters and overline syntax are rejected rather than interpreted ambiguously.
Each additive symbol or permitted subtractive pair is a token with its integer contribution. Its bar width is proportional to the total, and selecting it shows its explanation and the cumulative prefix value.