Roman Numeral Calculator

Calculator Use

Add, subtract, multiply and divide Roman numerals from I to MMMCMXCIX and/or numbers from 1 to 3999. Get answers in Roman numerals and regular numbers. This Roman numeral calculator shows the answer with steps when you add or subtract Roman numerals.

See the Roman Numeral Converter to convert between Roman numerals and numbers.

Your answer may contain Roman numerals with an overline. An overline means that the value of the Roman numeral is multiplied by 1,000. See the chart below for Roman numeral values and overline values.

Roman Numeral Notation

Roman numerals are written in additive and subtractive notation. Additive notation means that the individual values in a Roman numeral are added together to get the total value. In the case of VIII you add up the values for V and three I's. V is 5 and I is 1, so 5+1+1+1 = 8.

Subtractive notation means that value of the Roman numeral is found by taking the last character value and subtracting the value of the character that comes just before it. In the case of XC you subtract the value of X from the value of C. X is 10 and C is 100, so 100-10 = 90.

Related Calculators

The Roman Numeral Converter lets you convert regular numbers into Roman numerals, or Roman numerals into numbers.

The Roman Numeral Date Converter lets you convert dates into Roman numerals, or Roman numerals into number dates.