Roman Numeral Converter
Text ToolsNumbers ↔ Roman numerals (1–3999)
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History
All history →Roman Numeral Converter — at a glance
Switch between everyday numbers and Roman numerals instantly.
2026
Run
MMXXVI
How to use it — step by step
A number from 1 to 3999, or a Roman numeral like XIV.
1
Paste your input
Paste or type your content into the big input box.
2
Convert
Press the button. The result is created instantly on your device.
3
Copy the result
Check the output and press Copy to use it anywhere.
Pro tips
Small things that make the result better.
✦The tool detects whether you typed digits or letters.
✦Only I, V, X, L, C, D and M are valid letters.
✦Roman numerals have no zero and stop at 3999 in standard form.
Quick facts
1–3999standard range
Two-wayauto detect
Validatedcatches wrong numerals
Freeno signup
Frequently Asked Questions
Why can’t I convert 4000?+
Standard Roman numerals use at most three M’s, so the largest number is 3999 (MMMCMXCIX).
Is IIII valid for 4?+
Standard form uses IV. IIII appears on some clocks but is not the standard numeral.
What is the Roman numeral for 0?+
There is none — the Romans had no symbol for zero.
Is my data safe?+
Yes. Everything runs inside your own browser. Your text, files and images are never uploaded to any server.
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