991 in Roman numerals

The number 991 is written in Roman numerals like this: CMXCI

CMXCI = 991

How to write 991 in Roman numerals

Split the number by place value and write each part in Roman numerals:

• 900 = CM (1000 − 100)
• 90 = XC (100 − 10)
• 1 = I

Put the parts together: CM + XC + I = CMXCI.

When a smaller symbol comes before a larger one, it is subtracted.

Going the other way? See the Roman numeral CMXCI.

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990 in Roman numerals: CMXC

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992 in Roman numerals: CMXCII

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