Roman numeral converter
Convert between Arabic numbers and Roman numerals instantly. Type either and get the other.
How Roman numerals work
Roman numerals use seven symbols to represent numbers. The symbols are I (1), V (5), X (10), L (50), C (100), D (500), and M (1000). Numbers are formed by combining these symbols. Generally larger values are written before smaller ones and you add their values together — so VIII means 5 + 1 + 1 + 1 = 8 and LXII means 50 + 10 + 1 + 1 = 62.
The subtractive principle handles the four values that would otherwise require four of the same symbol in a row. Instead of IIII for 4, Romans wrote IV meaning 5 minus 1. Instead of VIIII for 9, they wrote IX. The six subtractive combinations are IV (4), IX (9), XL (40), XC (90), CD (400), and CM (900). These are the building blocks that make the system work.
The history of Roman numerals
The system grew out of Etruscan tally marks and served the Roman world for over a thousand years, from market ledgers to monument inscriptions. Its great weakness was arithmetic — try long division in Roman numerals — and it had no symbol for zero. When Fibonacci's Liber Abaci introduced Hindu-Arabic numerals to European merchants in 1202, the practical advantages were overwhelming, though the changeover took centuries: bookkeepers were still mixing both systems in the 1500s. Roman numerals survived not for calculation but for ceremony, which is exactly the role they play today.
Common uses for Roman numerals today
Roman numerals appear in copyright notices on films, television shows, and books. Sporting events like the Super Bowl and Olympic Games use Roman numerals for edition numbers. Clock and watch faces frequently use Roman numerals for hours. Chapter and section numbers in books, legal documents, and formal outlines use Roman numerals. Monarchs and popes use Roman numerals to distinguish rulers with the same name — Henry VIII, Pope John Paul II. Architectural inscriptions and monuments display years in Roman numerals.
Frequently asked questions
How do I convert a number to Roman numerals?
Type any number from 1 to 3999 into the Arabic field and the Roman numeral appears instantly; type a numeral like MMXXVI into the Roman field and it converts back the other way. The converter validates as you type, so an impossible sequence like IIII or VX is flagged rather than guessed at — useful when checking a numeral you copied from a monument, movie credit or tattoo design before trusting it.
What is the current year in Roman numerals?
2026 is MMXXVI — MM (2000) + XX (20) + VI (6). Nearby years: 2024 was MMXXIV, 2025 was MMXXV, and 2030 will be MMXXX. Year conversions are the most common real-world use of Roman numerals, appearing in film copyright notices, cornerstone inscriptions and event numbering, and the pattern is easy to read once you spot the MM prefix that every year this millennium shares.
What is XIV in numbers?
14. Read Roman numerals left to right, adding values — X is 10 — but when a smaller symbol precedes a larger one, subtract it: IV is 5 minus 1, so XIV is 10 + 4. That one rule unlocks most numerals you will meet: XIX is 19 (10 + 9), XL is 40 (50 minus 10), and MCMXCIV is 1994. Paste any numeral into the converter to check your reading.
Why do clock faces use IIII instead of IV?
Most Roman-numeral clock faces show 4 as IIII rather than the standard IV — a tradition so old its origin is debated. Popular explanations include visual balance (IIII mirrors the VIII opposite it on the dial), an old convention predating widespread subtractive notation, and the legend that a French king simply preferred it. Watchmakers call IIII the "clockmaker's four", and it remains one of the few places where non-standard Roman numerals are considered correct.
Why can Roman numerals only go up to 3999?
Because M (1000) is the largest symbol and standard rules allow at most three repetitions, MMMCMXCIX — 3999 — is the ceiling. The Romans did write larger numbers using extensions such as the vinculum, a bar drawn over a numeral to multiply it by 1000 (V̄ meant 5000), but those marks are not standard today and most fonts and systems cannot render them reliably, which is why this converter and most style guides stop at 3999.