Roman Numeral Converter

Convert numbers to Roman numerals and Roman numerals back to numbers from 1 to 3999. Batch conversion, lowercase output and checks for non-standard forms.

  • Free, no sign-up
  • Runs in your browser
  • Your data stays private

How to use the Roman Numeral Converter

  1. Paste numbers or Roman numerals, one per line.
  2. The direction is detected for each line.
  3. Copy the results.

Why use this Roman Numeral Converter

  • Both directionsNumbers become Roman numerals and Roman numerals become numbers automatically.
  • Batch conversionConvert a whole list at once.
  • ValidationFlags non-standard forms like IIII and shows the correct version.
  • Lowercase optionWrite results as xiv instead of XIV.

Frequently asked questions

How do I write 2025 in Roman numerals?

2025 is MMXXV: 2000 is MM, 20 is XX and 5 is V.

What is the largest Roman numeral?

Standard Roman numerals reach 3999 (MMMCMXCIX). Larger values use a bar over the symbol, which this tool does not draw.

Is IIII a valid Roman numeral?

Clocks often use IIII, but the standard form of 4 is IV. The tool accepts both and tells you which is standard.

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