Productive ToolboxRoman Numeral Converter
Convert between Arabic numbers and Roman numerals instantly. Bidirectional conversion with validation and history.
Range: 1 - 3999
Roman Numeral Reference
Roman Numeral
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Related tools
How to Convert Roman Numerals
Simple Instructions
- 1Choose the direction: Select Number → Roman to write a number in Roman numerals, or Roman → Number to read one.
- 2Enter the value: Type a whole number from 1 to 3,999, or Roman numerals such as MCMLXXXVII. Lower case works too.
- 3Read and copy: The result appears as you type, with an error message if the numeral is not valid. Copy it or keep it in your history.
What You Can Do
- ✓Convert any number from 1 to 3999 to Roman numerals
- ✓Convert Roman numerals back to standard numbers
- ✓Validate Roman numeral format with error detection
- ✓Generate random numbers for testing conversions
- ✓Access interactive reference chart of all Roman symbols
- ✓Save conversion history for quick reference
Understanding Roman Numerals
Basic Symbols
Subtractive Notation
When a smaller value appears before a larger value, it is subtracted:
Conversion Examples
Example 1
Convert 49 to Roman:
49 = XLIX
(40 + 9 = XL + IX)
Example 2
Convert 1990 to Roman:
1990 = MCMXC
(1000 + 900 + 90 = M + CM + XC)
Example 3
Convert 2024 to Roman:
2024 = MMXXIV
(2000 + 20 + 4 = MM + XX + IV)
Frequently Asked Questions
What is 2026 in Roman numerals?
2026 is MMXXVI: MM (2,000) + XX (20) + VI (6). 2025 is MMXXV and 2027 is MMXXVII.
What do the Roman numeral letters stand for?
I = 1, V = 5, X = 10, L = 50, C = 100, D = 500 and M = 1,000. Every other number is written by combining them from largest to smallest.
How does subtractive notation work?
A smaller numeral written before a larger one is subtracted from it. Only six pairs are used: IV (4), IX (9), XL (40), XC (90), CD (400) and CM (900). So 49 is XLIX (40 + 9), not IL.
How do I write a year or a date in Roman numerals?
Convert each part separately. The year 1990 is MCMXC (1,000 + 900 + 90), and a date such as 14 July 2024 is written XIV · VII · MMXXIV, in day-month-year or month-day-year order as you prefer.
Why does the converter stop at 3,999?
Standard Roman numerals have no symbol above M (1,000) and M may be repeated only three times, so MMMCMXCIX (3,999) is the largest number they can write. Larger numbers used a bar over a numeral to multiply it by 1,000, which is not part of modern usage.
Is there a Roman numeral for zero?
No. The Romans had no numeral for zero; medieval writers sometimes used the word nulla or the letter N instead.
Why Use Our Roman Numeral Converter?
Instant Conversion
Get results instantly as you type with real-time validation and error detection.
100% Private
All conversions happen in your browser. Your data is never sent to any server.
Educational
Learn Roman numerals with our interactive reference chart and detailed examples.
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