ToolStack › Roman Numeral Converter
Everyday Utilities

Roman Numeral
Converter

Instantly convert any number (1–3,999) to Roman numerals, or any Roman numeral back to a regular number. Full bidirectional conversion with a step-by-step breakdown, quick examples, and a complete reference chart.

Arabic Number
⇄
Roman Numeral
Breakdown will appear here
Common conversions — click to load
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📖 How to Use the Roman Numeral Converter
1
Convert a number to Roman
Type any whole number from 1 to 3,999 in the left (Arabic) field. The Roman numeral result appears instantly in the right field. The breakdown strip below explains exactly how the numeral was constructed — which symbols were combined and why. Click Copy Roman to copy the result to your clipboard.
2
Convert Roman numerals to a number
Type or paste Roman numerals directly into the right field (uppercase or lowercase both work). The equivalent Arabic number appears instantly on the left. If you enter an invalid Roman numeral — like one with too many repeated symbols or an incorrect subtractive combination — the field turns red and shows an error. The breakdown shows how each symbol was parsed.
3
Use the quick examples
Click any card in the quick examples grid to instantly load that number into the converter. These include common use cases — Super Bowl numbers, years (birth years, famous dates), clock numbers, and other frequently searched Roman numerals. Great for checking a specific number without having to look it up or type it yourself.
4
Read the breakdown
The breakdown strip below the converter explains each numeral symbol used. For example, MMXXV breaks down as M (1000) + M (1000) + X (10) + X (10) + V (5) = 2025. For subtractive cases like IV (4), it shows I before V means 5−1 = 4. This is helpful for learning or for explaining a tattoo design to someone else.
Why Roman numerals only go to 3,999: The standard Roman numeral system uses M for 1,000 — and by convention, no symbol can be repeated more than three times in a row. Three Ms = MMM = 3,000, and adding anything above 999 to that would require a fourth M, which isn't allowed. Ancient Romans used a bar over a symbol (called a vinculum) to mean ×1,000, but that convention isn't widely used today. So 3,999 (MMMCMXCIX) is the largest number in standard Roman numerals.
Roman Numeral Symbol Reference
SymbolValueSubtractive RuleExample
I1I before V or X subtractsIV = 4, IX = 9
V5Never subtractedVI = 6, VII = 7
X10X before L or C subtractsXL = 40, XC = 90
L50Never subtractedLX = 60, LXX = 70
C100C before D or M subtractsCD = 400, CM = 900
D500Never subtractedDC = 600, DCC = 700
M1,000Never subtracted in standard systemMM = 2000, MMM = 3000

Subtractive notation explained

Roman numerals use subtractive notation for six specific combinations: IV (4), IX (9), XL (40), XC (90), CD (400), and CM (900). The rule is: a smaller symbol placed before a larger one means subtraction. I before V = 5−1 = 4. X before L = 50−10 = 40. C before M = 1000−100 = 900. This was introduced to avoid four repeated symbols (IIII, XXXX, CCCC). You'll still see IIII on some clock faces — that's a stylistic choice, not standard notation.

Where Roman numerals are still used today

Super Bowl numbers (Super Bowl LVIII = 58). Copyright years in film credits ("© MMXXV"). Clock faces — especially Roman numerals on watches and grandfather clocks. Outlines and numbered lists (I, II, III, IV…). Book preface and front matter page numbers. Olympic Games (Paris 2024 was the XXXIII Olympiad). Monarchs and popes (King Charles III, Pope John Paul II). Movie sequels (Rocky IV, Star Wars Episode IV). Tattoos — birth years and significant dates are among the most popular tattoo designs globally.

How to read a Roman numeral year

Break the year into thousands, hundreds, tens, and ones, then combine. For 2025: 2000 = MM, 0 hundreds = nothing, 20 = XX, 5 = V → MMXXV. For 1994: 1000 = M, 900 = CM, 90 = XC, 4 = IV → MCMXCIV. The key is knowing the subtractive pairs: 4=IV, 9=IX, 40=XL, 90=XC, 400=CD, 900=CM. Once you recognize these six combinations, you can read any Roman numeral year quickly.

Roman numerals for tattoos — tips

Birth years (e.g. MCMXC for 1990), anniversaries, and meaningful dates are the most common Roman numeral tattoo designs. When designing a tattoo, verify the conversion with a tool like this one before committing — mistakes in Roman numerals are common, especially with subtractive pairs. Standard convention uses uppercase. The most commonly tattooed years fall between 1980 and 2010 — a range where CM (900) appears in almost every year (1900–1999). Double-check: MCMXCIX = 1999, MM = 2000, MMXXV = 2025.

Frequently Asked Questions
What is 2025 in Roman numerals? ▾
2025 in Roman numerals is MMXXV. Breaking it down: MM = 2,000 (two thousands), XX = 20 (two tens), V = 5. Added together: 2000 + 20 + 5 = 2025. You can type 2025 into the converter above to confirm this and see the full breakdown. Similarly, 2024 = MMXXIV, 2026 = MMXXVI, and 2000 = MM.
What Super Bowl is LVIII? ▾
LVIII = 58. Breaking it down: L = 50, V = 5, I = 1, I = 1, I = 1. So 50 + 5 + 1 + 1 + 1 = 58. Super Bowl LVIII was played in February 2024. You can type LVIII into the Roman numeral field above to convert it instantly. The Super Bowl has used Roman numerals since Super Bowl V in 1971, skipping them only once for Super Bowl 50 in 2016 (the NFL decided "L" looked awkward as the sole symbol).
Why can't Roman numerals go above 3,999? ▾
The standard Roman numeral system limits symbol repetition to three times in a row — so the maximum is MMM (3,000) plus the largest value below 1,000, which is CMXCIX (999), giving MMMCMXCIX = 3,999. Going higher would require a fourth M (MMMM), which violates the repetition rule. Ancient Romans used a vinculum (a bar over the numeral) to multiply by 1,000 — so V̄ = 5,000, X̄ = 10,000 — but this convention is rarely used in modern contexts and this tool follows standard convention (1–3,999).
What is my birth year in Roman numerals? ▾
Type your birth year into the Arabic number field on the left — the Roman numeral conversion appears instantly. Some common birth years: 1990 = MCMXC, 1995 = MCMXCV, 2000 = MM, 2001 = MMI, 2005 = MMV, 2010 = MMX, 2025 = MMXXV. Years from 1900–1999 all start with MCM (900 + 1000 = 1900-something). Years from 2000 onward start with MM. The breakdown strip below the converter shows each symbol and its value for any year you enter.
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How to Use the Roman Numeral Converter

Convert any number to Roman numerals or any Roman numeral to a decimal number — with step-by-step breakdown.

01
Enter a number or Roman numeral
Type in either field — conversion works in both directions. Enter '2025' to see MMXXV, or enter 'XIV' to see 14.
02
Read the step-by-step breakdown
The tool shows exactly how the conversion works: which numerals were used and why. Great for understanding the underlying system.
03
Use the quick examples
The example buttons pre-fill common conversions — Super Bowl numbers, year tattoos, clock numerals. Click any to see the breakdown.
04
Check the full reference chart
Scroll down for the complete Roman numeral reference chart covering I through M. Useful for reading Roman numerals on buildings, clocks, and formal documents.
💡
💡 Roman numerals don't have a zero and can't represent fractions. They're used today for clock faces, year credits in film, Super Bowl numbering, legal document sections, and prestige branding.