About the Handiwork Roman Numeral Converter
The Roman Numeral Converter translates between standard Arabic numbers (1–3999) and Roman numerals in both directions. Pick a mode, enter a value, and copy the result — with a quick symbol reference and validation for canonical form.
How to use the Handiwork Roman Numeral Converter
- Choose number-to-Roman or Roman-to-number.
- Enter a value or use Try example.
- Copy the result or swap direction to convert back.
Roman numeral rules
Roman numerals combine letters I (1), V (5), X (10), L (50), C (100), D (500), and M (1000). Subtractive notation (IV for 4, IX for 9) is standard. The classical system represented here goes up to MMMCMXCIX (3999).
Common uses today
You will still see Roman numerals on clock faces, book chapters, movie sequels, monarch names, and sporting events (Super Bowl LV, etc.). A converter avoids mistakes with subtractive pairs and letter order.
Frequently asked questions
What is the largest Roman numeral supported?
The converter supports standard Roman numerals from 1 (I) through 3999 (MMMCMXCIX).
Why was my Roman numeral rejected?
Only standard subtractive notation is accepted — for example IV and IX are valid, but non-standard forms like IIII are not.