Is the Roman numeral converter free?

Yes! Our Roman numeral converter is completely free with no registration required. Convert unlimited numbers between Arabic and Roman numerals at no cost.

What number range does it support?

The converter supports Arabic numbers from 1 to 3999, which covers the traditional range of Roman numerals used in classical and medieval periods.

Does it explain subtractive notation?

Yes! The reference guide includes subtractive notation examples like IV (4), IX (9), XL (40), XC (90), CD (400), and CM (900) with clear explanations.

Can I see my conversion history?

Absolutely! The converter tracks your conversion history so you can review previous conversions and learn from patterns in Roman numeral formation.

Is it useful for education?

Yes! The tool includes educational features like symbol guides, subtractive notation explanations, and examples perfect for students, teachers, and history enthusiasts.

Free Online Roman Numeral Converter (No Signup)

Number to Roman

Enter a number (1 - 3,999,999):

Enter a value above

Year & Date to Roman Numerals

Convert a calendar year (e.g. 2026 = MMXXVI) or a full date into Roman numerals, the way they appear on movie credits, cornerstones, and monuments.

Year (1 - 3999):

Enter a year above

Full date

Day

Month

Year

Enter a day, month and year

Roman Numeral Reference

Basic Symbols

Roman	Value
I	1
V	5
X	10
L	50
C	100
D	500
M	1,000

Subtractive Notation

Roman	Value
IV	4
IX	9
XL	40
XC	90
CD	400
CM	900

Quick Examples

Conversion History

No conversions yet. Start converting to see your history here.

How to Use This Tool

Pick a direction — On the Converter tab, use the Switch button to toggle between Number to Roman (e.g. 42 to XLII) and Roman to Number (e.g. MCMLXXXIV to 1984).

Enter your value — Type a number or a Roman numeral. Results update live as you type, with clear error messages for invalid numerals like IIII or VV.

See the breakdown — Each result shows a symbol-by-symbol breakdown so you can learn how the numeral is built.

Convert years and dates — The Date Converter tab turns a year or a full date into the form seen on movie credits and monuments, including a one-click "Use today".

Copy and review — Copy any result with one click. The History tab keeps your recent conversions, saved in your browser.

Common Use Cases

How do I write a year in Roman numerals? Enter the year (e.g., 2024) in the Arabic input to get MMXXIV -- commonly used in movie credits and building cornerstones.

What number does a Roman numeral represent? Paste the numeral (e.g., CDXLIV) in the Roman input to find it equals 444.

How does subtractive notation work? The reference guide below the converter explains how IV means 4 (5 minus 1), IX means 9, XL means 40, and so on.

Can I use this for homework or research? Yes -- the conversion history tracks all your lookups, making it easy to review patterns and learn Roman numeral formation.