An actual, working Roman numeral calculator. (Requires a Java-compatible browser.) It also has explanations of Roman numeral syntax, conversion, and the Roman calendar.
Roman Numeral and Date Conversion with Roman Calculator & Roman Numerals Test
Roman Numeral Date Conversion Guide
This explains everything you wanted to know about reading years written in Roman numerals, including alternative forms and the apostrophus. Much more in depth than anything you'll find here.
Roman Numerals and Dates
Discusses converting dates into Roman form and the history of Roman numerals, plus it has conversion tables.
How Roman Numerals Work
Lee's Useless Roman Numeral Converter
Written by: Lee K. Seitz (
Created: 8 Dec 1999; Last Modified: 14 May 2002