Roman Numerals Converter
Type a number to see it in Roman numerals — or type Roman numerals to see the number. The full classic range 1–3999 is supported, both directions, instantly. Wedding dates, tattoo ideas, movie credits, chapter numbers and homework all land here eventually.
Roman numerals obey a small set of rules: I, X, C and M repeat; V, L and D never do; and a smaller symbol before a larger one subtracts (IV = 4, CM = 900). The converter produces the standard modern form and rejects invalid strings like IIIV rather than guessing.
| Symbol | Value |
|---|---|
| I · V · X | 1 · 5 · 10 |
| L · C · D | 50 · 100 · 500 |
| M | 1000 |
| IV · IX | 4 · 9 (subtract before) |
| XL · XC | 40 · 90 |
| CD · CM | 400 · 900 |
How to use
- Type an ordinary number (1–3999) in the first box — the Roman form appears as you type.
- Type Roman numerals in the second box (like MMXXVI) — the number appears instantly.
- Both boxes stay in sync, so you can flip direction at any time without pressing anything.
Frequently asked questions
What is 2026 in Roman numerals?
2026 is MMXXVI: MM (2000) + XX (20) + VI (6). Type any year into the converter to see it instantly — 2025 is MMXXV, 2027 will be MMXXVII.
Why is 4 written IV and not IIII?
The modern standard uses subtraction: a smaller numeral before a larger one means 'take it away', so IV = 5 − 1 = 4. Old clock faces often show IIII for visual balance, but IV is the correct written form.
What is the biggest number in Roman numerals?
With the standard seven symbols and no overline notation, the largest is 3999 (MMMCMXCIX). Larger numbers historically used a bar over a symbol to multiply by 1,000 — the converter sticks to the standard 1–3999 range.
Are zero and negative numbers possible in Roman numerals?
No. The Romans had no symbol for zero and no negative numbers, which is one reason the system was eventually replaced by Arabic numerals for mathematics.