Roman Numerals Converter
Type a number or a Roman numeral below. The conversion runs as you type — no button to press.
becomes
becomes
How Roman numerals work
Roman numerals use seven letters — I (1), V (5), X (10), L (50), C (100), D (500), and M (1000) — combined by addition and subtraction. A smaller symbol placed before a larger one is subtracted (IV = 4); placed after, it's added (VI = 6). This converter supports the standard range of 1 to 3999.
Frequently asked
What's the highest number I can convert?
3999 (MMMCMXCIX), using standard notation without overline extensions.
Does it accept lowercase Roman numerals?
Yes — type mmxxvi and it converts the same as MMXXVI.
Can I share a specific conversion?
Yes — a shareable link is generated automatically as you type, linking directly to that number's or numeral's own page.