How to Use the Roman Numeral Converter
Our bidirectional converter lets you translate any number from 1 to 3999 into Roman numerals — or decode any Roman numeral back to its Arabic equivalent — in real time. No button press needed; just start typing.
Step-by-Step Instructions
- Type an Arabic number (1–3999) in the left field to see the Roman numeral.
- Or type a Roman numeral (e.g. XIV) in the right field to see the Arabic number.
- Use the copy button next to each field to copy the result.
- Refer to the symbol table below the inputs for quick reference.
Use Cases
Clocks & Watches
Many analog clock faces use Roman numerals for hour markers. Our converter helps you quickly verify what XII, III, VI, or IX represent.
Movies & TV Sequels
Hollywood often uses Roman numerals for sequels — Rocky IV, Star Wars Episode VI, Fast & Furious X. Decode any title instantly.
Books & Documents
Academic books use Roman numerals for preface page numbers and chapter outlines. Convert them to Arabic numbers to navigate quickly.
Dates & Years
Copyright notices on films and TV shows often display the production year in Roman numerals. Decode MMXXIV to confirm it's 2024.
Key Features
- Real-time bidirectional conversion — no button needed
- Supports the full classical range: 1 to 3999
- Validates invalid Roman numeral sequences (e.g. IIII)
- Copy buttons for both Arabic and Roman outputs
- Built-in symbol reference table (I, V, X, L, C, D, M)
- Pure JavaScript — works offline, no server calls