Roman numeral converter
Convert an Arabic number to a Roman numeral or a Roman numeral back to a number (1-3999).
Calculations are based on Estonia's tax rates in force for 2026. Results are informational.
Last updated: 2026-06-03
The Roman numeral system
Roman numerals use the symbols I (1), V (5), X (10), L (50), C (100), D (500) and M (1000). A smaller symbol before a larger one is subtracted (e.g. IV = 4, IX = 9). The system covers numbers from 1 to 3999.
How it is calculated
Formula
Roman numerals use the symbols I=1, V=5, X=10, L=50, C=100, D=500, M=1000. A smaller symbol before a larger one is subtracted (IV=4, IX=9). Range 1-3999.
Example
2026 = MMXXVI; XLII = 42.
Frequently asked questions
How do I write an Arabic number in Roman numerals?+
Each place is converted into the symbols I, V, X, L, C, D, M. For example, 2026 = MMXXVI.
What is the largest Roman numeral?+
In the standard system the maximum is 3999 (MMMCMXCIX); larger numbers use special notation.