Calculator for Roman numerals

Calculate with Roman numbers! Add, subtract, multiply... or just see what a Roman number is in standard form. See also the converter for how Roman numbers work.




Examples to try: VII+II, VII-II, VII*II, M-I

1 = I 5 = V 10 = X 100 = C 500 = D 1,000 = M

This calculator accepts mathematical formulas with Roman and Arabic numerals. The supported operators are: addition (+), subtraction (-), division (/), multiplication (*) and exponentiation (^ or **). Parentheses are OK: (I+II)*III. The result is displayed in Roman numbers if it's an integer in the range 1…4,999,999,999. Simple fractions such as 1/2, 1/3, 1/4, 1/6, 1/12 and 1/24 are supported. Decimal numbers are truncated to 6 decimals. The calculator does not verify the Roman numbers you type is in a commonly used format.

Converter for Roman numerals

Roman numerals complete list

©Tuomas Salste