Number tool
Roman Numeral Converter
Enter a number (1–3999) or a Roman numeral — the other side updates automatically.
About the Roman Numeral Converter
The Roman Numeral Converter changes numbers into Roman numerals and Roman numerals back into numbers. It is useful for clocks, book chapters, film dates, outlines and homework.
Roman numerals use the letters I (1), V (5), X (10), L (50), C (100), D (500) and M (1000). Smaller values placed before larger ones are subtracted, as in IV for 4 or CM for 900. The standard system covers 1 to 3999, because repeating M more than three times is not conventional.
How to use it
- Enter a number to see the numeral.
- Or enter a Roman numeral to see the number.
- Check the result.
- Copy it.
Tips and good to know
- Only I, X, C and M can be repeated up to three times.
- V, L and D are never repeated.
- 0 has no Roman numeral.
Frequently asked questions
What is 2024 in Roman numerals?
MMXXIV.
What is the largest number supported?
3999.
Is IIII valid?
It appears on some clocks but the standard form is IV.