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How to Use
- 1Select "Number to Roman" and enter a number from 1 to 3999.
- 2The Roman numeral is shown instantly with a full symbol breakdown.
- 3Select "Roman to Number" and enter a Roman numeral (e.g. MMXXIV).
- 4See the equivalent Arabic number with a per-symbol explanation.
- 5Copy the result with one click.
About Roman Numeral Converter
The Roman Numeral Converter converts between Arabic numbers (1–3999) and Roman numerals. It supports all standard numeral forms including subtractive notation (e.g. IV=4, IX=9, XL=40).
A detailed breakdown table shows how each symbol contributes to the total value, making it a great learning tool for students and an efficient converter for everyday use.
Frequently Asked Questions
What is the valid range?
Roman numerals are supported from 1 to 3999. Numbers outside this range are not valid in standard Roman numeral notation.
What is subtractive notation?
Subtractive notation means placing a smaller numeral before a larger one to represent subtraction, e.g. IV = 5 − 1 = 4.
Is the input case-sensitive?
No. Both uppercase and lowercase Roman numeral input is accepted and normalized to uppercase.