Roman numeral to Decimal Converter

Convert roman numeral to decimal instantly. Browser-based, no signup.

Converter Number Systems Updated Apr 20, 2026
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How to Use
  1. Enter a number on the left in Roman numeral format.
  2. The Decimal equivalent appears live on the right.
Roman numeral
↔
Decimal
More: Binary Octal Hexadecimal English words Scientific notation

About this conversion

Convert numbers between Roman numeral and Decimal representation. Live, browser-side, with a copy button.

Frequently Asked Questions

Roman numeral range?

Standard subtractive notation supports 1 through 3,999.

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