# Roman Numerals

> Seamlessly convert between standard Arabic numerals and classical Roman numeral notations.

Page: https://askcalculators.com/calculator/roman-numeral-converter/
Definition: https://askcalculators.com/calculator/roman-numeral-converter/definition.json
JSON Schema: https://askcalculators.com/calculator/roman-numeral-converter/schema.json
Version: 7.0.0
Maintained by: AskCalculators (software project; not a credentialed reviewer)
Qualified review: pending. Automated checks do not establish professional approval.
Page status: Live
Review status: Pending

## Use
Open the calculator page and enter values. Query-string parameters can restore and bookmark a calculation.
Example: https://askcalculators.com/calculator/roman-numeral-converter/?number=2024&mode=toRoman

## Inputs
- number: Decimal Number (1-3999); type=number; optional; default=2024
- roman: Roman Symbols; type=text; optional; default=
- mode: Mode; type=select; optional; default=toRoman

## Outputs
- result: Result; format=text; primary

## Formula
Decimal-to-Roman uses descending numeral values; Roman-to-decimal subtracts a value when it precedes a larger value.

## Rules
- Empty optional inputs are undefined, not zero.
- Hidden conditional inputs are ignored.
- Do not invent missing required inputs.