Roman Numeral Converter

Convert between numbers and Roman numerals instantly. Works for 1 to 3,999. Shows the full breakdown of how each numeral is constructed.

Enter Number or Roman Numeral

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Number (1 – 3,999)2024

13,999

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Did You Know?

Quick year conversions

Movie copyright dates, building inscriptions, and Super Bowl numbers are all in Roman numerals. MCMXCIX = 1999. MM = 2000. MMXXV = 2025. The pattern: M=1000, CM=900, XC=90, IX=9.

How to use this calculator

Choose direction

Number to Roman or Roman to Number.

Enter your value

For numbers: 1–3,999. For Roman: type uppercase letters (e.g. MMXXIV).

See the breakdown

The result panel shows how each numeral contributes to the final value.

The formula explained

Roman numerals use 7 symbols: I(1) V(5) X(10) L(50) C(100) D(500) M(1000).

Subtractive notation: IV=4, IX=9, XL=40, XC=90, CD=400, CM=900

To convert: repeatedly subtract the largest Roman value that fits, appending the symbol each time. Standard Roman numerals go from 1 to 3,999 (MMMCMXCIX).

Frequently Asked Questions

What is MMXXIV in numbers?

MMXXIV = 2024. MM=2000, XX=20, IV=4. 2000+20+4=2024.

How do you write 4 in Roman numerals?

IV. The I before V means subtract 1 from 5. Similarly IX=9, XL=40, XC=90, CD=400, CM=900.

What is the largest Roman numeral?

MMMCMXCIX = 3,999. Traditional Roman numerals do not go beyond 3,999 without additional notation (like a bar over a numeral to multiply by 1,000).

Why do clocks use IIII instead of IV?

Mostly tradition and aesthetics. IIII creates better visual balance on a clock face opposite VIII. The Romans themselves commonly used IIII in practice despite IV being correct.

What is 2024 in Roman numerals?

2024 in Roman numerals is MMXXIV. M=1000, M=1000, X=10, X=10, IV=4. Total = 1000+1000+10+10+4 = 2024.