21K School/ Calculators/ Roman Numeral Calculator

Roman Numeral Calculator

Convert between Roman numerals and integers (1–3999) and perform addition in Roman notation.

1–3999

FEATURE

Bidirectional

METHOD

Roman & Integer

OUTPUT

Enter Values

Convert Direction

Value

Result

Result—

Detail—

Notes—

Steps

How It Works

Choose direction: Integer to Roman or Roman to Integer.

Integers: uses largest subtractive Roman values first.

Roman input: validates characters and applies subtractive rule.

Example

2024 → MMXXIV

IX = 9 (subtractive)

MCM = 1900

MMXXIV = 2024

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