Roman Numerals Calculator and Converter

Roman Numeral Converter

Roman → Decimal

Decimal → Roman

Enter Roman Numeral

Decimal Value

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Roman numerals are a numeral system that originated in ancient Rome. Numbers are represented by combinations of letters from the Latin alphabet.

Valid Roman numeral symbols: I (1), V (5), X (10), L (50), C (100), D (500), M (1000)

Modern → Roman

Roman → Modern

Select Date

Date Format

Roman Date

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Romans had a complex calendar system involving Kalends, Nones, and Ides. This converter uses modern Gregorian dates represented with Roman numerals.

Choose a format: concise DD.MM.YYYY or a more descriptive Latin-inspired style.

First Roman Numeral

Operation

Second Roman Numeral

Result

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This calculator converts Roman numerals to decimal, performs the calculation, and then converts the result back to Roman numerals.

Note: Results are limited to positive integers between 1 and 3999. Division results are floored (integer part only).