Roman Numeral Converter
Convert numbers to Roman numerals and Roman numerals back to numbers.
Roman numerals still appear on clocks, in book chapters, film credits and dates. Roman Numeral Converter turns ordinary numbers into Roman numerals (and back), so you can read or write them without counting on your fingers.
How to use roman numeral converter
- 1. Enter a number or a Roman numeral.
- 2. It's converted to the other form.
- 3. Copy the result.
When to use Roman Numeral Converter
Read a date or credit
Decode the Roman-numeral year in a film's copyright or a monument.
Number chapters or sections
Convert numbers to Roman numerals for a formal outline.
Learning
Practise reading and writing Roman numerals.
Only the standard form is accepted
Roman numerals are checked strictly: 4 is IV, 9 is IX, 99 is XCIX. Forms you may have seen — IIII on clock faces, or IC for 99 — are rejected rather than guessed at, so a typo can't silently give the wrong number. Lowercase input works. Two years for reference: MCMXCIX is 1999, MMXXVI is 2026.
Frequently asked questions
What range does it support?
1 to 3,999 (MMMCMXCIX). Larger numbers need a bar over the letters, which plain text can't show.
Can it convert numerals back to numbers?
Yes — enter a valid Roman numeral and get the number it represents.
Is my input uploaded?
No — conversion runs in your browser.