Roman Numerals Converter: Years, Chapters, Super Bowls, More

What’s this wristwatch doing in a movie set around ⅮⅭⅭⅬⅩⅩⅩⅢ ab urbe condita? Isn’t that from ⅯⅯⅮⅭⅭⅫ at least? If you’re similarly puzzled when a book turns to chapter ⅩⅩⅣ and Super Bowl ⅬⅩ is recalled, you’re not alone. You do not have to convert between Roman and decimal numbers in your head. Find here a Roman numerals to decimal (and vice versa) converter ⤓ instead.

First, on Calculus Beach

Draw a line in the sand on a beach. Draw another one, and draw a few more. Draw them in parallel, and while you’re at it put into the first a few pebbles.

If, now, you move the pebbles around, you are well on your way to calculus. It’s practically in your hands already: a pebble or small stone, in Latin and not by accident, is a “calculus.”

So, let’s put the pebbles and counting to good use converting some numbers:

Fast and Easy Roman Numerals ⇔ Decimal Numbers Converter: Years, Chapters, Super Bowls and More

Decimal Number to Roman Numeral

Type any whole number between (and including) 1 and 100 000 under Decimal Number to get its Roman numeral equivalent:

Not mere numbers: Ab Urbe Condita Converter: Modern Years to AUC ⇔

Roman Numeral to Decimal Number

Enter a Roman numeral (under Roman Numeral) in either Unicode characters or standard letters (upper or lower case) to get its decimal number equivalent:

ⅩⅩⅩⅫ successfully deciphered?

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Roman Numerals ⇔ Decimal Numbers Converter: FAQ

In what form can I enter the Roman numerals?

You can use the Unicode character for Roman numerals or the standard Latin substitutes, the latter in both upper and lower case.
Example: ⅮⅭⅭⅬⅢ, DCCLIII and dccliii all work.

Elsewhere in the classical world:
Greek Numerals ⇔ Decimal Numbers Converter

Will a number like “ⅮⅭⅭⅬⅡⅤ” work?

No, not in every case.

The converter only looks one character ahead, so subtracting with reversed character order will only work if you use Ⅱ (which is one character), for instance, but not for II (two characters).

(First published June 2024, last updated May 2026)