Convert Roman Numerals & Decimals

Professional Roman Numerals converter with instant processing. Convert between decimal and roman numerals instantly.

Instant Processing
100% Private
Completely Free

Roman numerals to decimal conversion result

I = 1
Decimal Roman Decimal Roman Decimal Roman Decimal Roman
1I20XX100C1000M
2II30XXX200CC2000MM
3III40XL300CCC3000MMM
4IV50L400CD3500MMMD
5V60LX500D3900MMMCM
6VI70LXX600DC3999MMMCMXCIX
7VII80LXXX700DCC1994MCMXCIV
8VIII90XC800DCCC2024MMXXIV
9IX99XCIX900CM2025MMXXV
10X19XIX49XLIX444CDXLIV
Roman Numerals Rules
  • I = 1, V = 5, X = 10
  • L = 50, C = 100, D = 500
  • M = 1000
  • Subtractive: IV (4), IX (9), XL (40), XC (90), CD (400), CM (900)
  • ✓ Range: 1 to 3,999
  • ✓ No zero in Roman numerals
  • ✓ Repeat max 3 times (III, XXX, CCC)
  • ✓ Case insensitive (i, I, v, V)

Your privacy is protected! No data is transmitted or stored.

Powerful Features

Everything You Need, Zero Hassle

Convert roman numerals to decimal with our powerful, intuitive tools

Dual Conversion

Convert between roman numerals and decimal numbers instantly. Perfect for students and historians!

Instant Results

Get instant conversion results with calculation breakdown. No waiting, no delays!

Copy & Share

Copy results with one click. Perfect for essays, dates, and historical references!

How It Works

Simple, Fast, Effortless

Convert Roman Numerals to Decimal in just a few clicks

01
Enter Value

Enter roman numeral or decimal number. Example: MCMXCIV or 1994

02
Click Convert

Click the appropriate Convert button to transform your value instantly!

03
View Breakdown

See your converted value with step-by-step calculation breakdown!

04
Copy & Use

Copy the result with one click. Perfect for essays and historical references!