Roman Numeral Converter
Translate whole numbers from 1 to 3,999 to Roman numerals and back.
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What is Roman Numeral Converter?
Roman Numeral Converter translates canonical Roman numerals and whole numbers between 1 and 3,999.
How to use Roman Numeral Converter
- 01
Choose the conversion direction and enter the value.
- 02
Use standard subtractive pairs such as IV, IX, XL and CM.
- 03
Copy the corresponding Roman numeral or decimal integer.
Roman Numeral Converter FAQ
Why is IIII rejected?
Modern canonical notation writes four as IV; rejecting noncanonical spellings keeps each supported number's representation unique.
Is Roman Numeral Converter private to use?
Yes. Number parsing, statistics, conversions and random generation all run locally in your browser.