Roman Numeral Converter
Convert between Roman numerals and decimal numbers instantly. Works both ways.
🏛️ Roman Numeral Converter
Roman Numeral Converter — Free, Instant Conversion
Convert any number to Roman numerals and convert Roman numerals back to numbers with our free Roman Numeral Converter. Supports all standard Roman numerals from I (1) to MMMCMXCIX (3999). Completely free with no account required.
Roman numerals are still widely used today — in clock faces, film copyright dates, book chapters, sporting events (Super Bowl LVIII), academic outlines, and architectural inscriptions. Understanding how to read and write Roman numerals is useful in many everyday and professional contexts.
Roman Numeral Reference
- I = 1
- V = 5
- X = 10
- L = 50
- C = 100
- D = 500
- M = 1000
How to Convert Roman Numerals — Step by Step
- Choose direction: Select "Number to Roman" or "Roman to Number".
- Enter value: Type a number (1–3999) or a Roman numeral string.
- Convert: The result appears instantly as you type.
- Copy: Click "Copy" to copy the result to clipboard.
- Learn the pattern: Review the breakdown to understand how the Roman numeral is constructed.
❓ Frequently Asked Questions
Standard Roman numerals go up to MMMCMXCIX (3999). Numbers above this traditionally required special notation (a bar over a numeral multiplied it by 1000).
The subtractive notation (IV = 4, IX = 9, XL = 40, etc.) was standardised to avoid repeating a symbol more than three times consecutively.
They appear on clock faces, film/TV copyright notices, Super Bowl numbering, book chapter headings, monarchs (King Charles III), and academic outlines.
No — Roman numerals have no symbol for zero, which was a significant limitation compared to Hindu-Arabic numerals.
Yes, 100% free with no account required.
Yes — enter any year from 1–3999 and get the Roman numeral equivalent. For example, 2025 = MMXXV.
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