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Roman Numerals Converter

Convert between Roman numerals and numbers (1-3999) with step-by-step explanations

What this tool does

Roman Numerals Converter helps you convert between Roman numerals and numbers (1-3999) with step-by-step explanations.

What you get

Roman Numerals Converter produces a direct output in this page and keeps all processing on your device, with nothing uploaded to our servers.

Free to use, no watermarks, runs in your browser—nothing uploads to our servers

Roman Numeral Symbols

Basic Symbols
I = 1
V = 5
X = 10
L = 50
C = 100
D = 500
M = 1000
Subtractive Notation
IV = 4
IX = 9
XL = 40
XC = 90
CD = 400
CM = 900

Common Examples

I, II, III
1, 2, 3
IV, V, VI
4, 5, 6
IX, X, XI
9, 10, 11
XLIX, L, LI
49, 50, 51
XC, C, CI
90, 100, 101
CD, D, DC
400, 500, 600
CM, M, MI
900, 1000, 1001
MCMLXXXIV
1984

Conversion Rules

1. Addition: When a larger numeral comes before a smaller one, add them (e.g., VI = 5 + 1 = 6).

2. Subtraction: When a smaller numeral comes before a larger one, subtract it (e.g., IV = 5 - 1 = 4).

3. Repetition: A symbol can be repeated up to three times (e.g., III = 3, XXX = 30).

4. Range: This converter supports numbers from 1 to 3999.

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