Roman Numerals Converter and Chart: 1 to 1000

The Roman numeral system uses seven symbols: I (1), V (5), X (10), L (50), C (100), D (500), and M (1000). All numbers in standard Roman numerals are composed of combinations of these seven symbols, following placement rules that determine whether a symbol adds to or subtracts from the running total.

Roman numerals are still in active use today in specific contexts: book prefaces and chapter numbering, clock faces, movie sequel titles and copyright years, formal document outlines, names (e.g., Henry VIII), and competition designations (Super Bowl LVIII). Knowing how to read and write them is a practical literacy skill, not just historical knowledge.

When a symbol appears before a symbol of equal or smaller value, it adds. III = 3 (1+1+1). VI = 6 (5+1). LX = 60 (50+10). When a smaller symbol appears before a larger symbol, it subtracts. IV = 4 (5−1). IX = 9 (10−1). XL = 40 (50−10). XC = 90 (100−10). CD = 400 (500−100). CM = 900 (1000−100).

Only six subtractive combinations are standard: IV, IX, XL, XC, CD, and CM. No other subtractive combinations are used in standard Roman numerals. VX (attempting to write 5 subtracted from 10) is not valid; the correct notation for numbers like 95 is XCV (90+5), not VC.

The standard algorithm: work from largest to smallest numeral value. Subtract the largest numeral value that fits into your remaining number, write that numeral, repeat with the remainder. For 2024: 2024 − 1000 = 1024 → M. 1024 − 1000 = 24 → MM. 24 − 10 = 14 → MMX. 14 − 10 = 4 → MMXX. 4 = IV → MMXXIV.

The values to work with, in descending order: 1000 (M), 900 (CM), 500 (D), 400 (CD), 100 (C), 90 (XC), 50 (L), 40 (XL), 10 (X), 9 (IX), 5 (V), 4 (IV), 1 (I). Including the subtractive forms in this list ensures you never need more than three of any symbol in a row.

Scan from left to right. When a smaller value precedes a larger value, treat them as a subtractive pair. Otherwise, add values sequentially. For MCMXCIV: M (1000) + CM (900) + XC (90) + IV (4) = 1994. For MMXXVI: MM (2000) + XX (20) + VI (6) = 2026.

Common year formats in Roman numerals: 2024 = MMXXIV; 2025 = MMXXV; 2026 = MMXXVI; 1999 = MCMXCIX; 2000 = MM. Film copyright years, which are traditionally shown in Roman numerals at the end of credits, follow exactly this pattern.

Standard Roman numerals represent numbers from 1 to 3,999 (MMMCMXCIX). Numbers 4,000 and above require a bar notation (a horizontal bar over a numeral multiplies its value by 1,000), which is rarely used in modern contexts. The system also has no symbol for zero — a significant limitation that contributed to the eventual adoption of the Hindu-Arabic numeral system in Europe.

For everyday purposes, Roman numerals are read and written in the 1 to 3,999 range. If you encounter a number above 3,999 in Roman numeral context, it is likely using extended notation or the source has made an error. The most common real-world upper limit is clock faces (XII = 12) and common chapter or page numbering.

Use these benchmark pairs for fast sanity checks.