EVERYDAY
Roman Numeral Conversion Calculator
Convert standard modern Roman notation in either direction.
Your result
EVERYDAYEnter your values and select calculate.
On this page How it works & practical examples
How to use the Roman Numeral Conversion Calculator
Convert standard modern Roman notation in either direction. The input is case-insensitive when parsing Roman numerals, but the output uses uppercase symbols.
The calculation
Use canonical subtractive Roman groups for integers 1 through 3999
Worked example
1994 converts to MCMXCIV; canonical MCMXCIV converts back to 1994.
Assumptions and limits
No zero, negative values, overline thousands or historical additive variants. Noncanonical forms such as IIII and IC are rejected.
Common questions
Which inputs should I use?
Convert standard modern Roman notation in either direction. The input is case-insensitive when parsing Roman numerals, but the output uses uppercase symbols.
What does the result exclude?
No zero, negative values, overline thousands or historical additive variants. Noncanonical forms such as IIII and IC are rejected.