918 in Roman Numerals
Nine hundred eighteen is written CMXVIII in Roman numerals. It uses the subtractive rule, where a smaller glyph placed before a larger one is taken away rather than added, which keeps the numeral short and is the part most people find fiddly.
How CMXVIII is formed
Reading left to right, 918 breaks into these additive parts. Each Roman symbol is added in turn to reach the total.
CM + X + V + I + I + I = 900 + 10 + 5 + 1 + 1 + 1 = 918.
Where 918 in Roman numerals is used
- Monarch and pope names, for example the 918th of a royal line.
Convert another number
918 is written CMXVIII in Roman numerals.
Frequently asked questions
How do you write 918 in Roman numerals?
Write 918 as CMXVIII, combining CM + X + V + I + I + I. Start from the largest value that fits and work down until nothing is left over.
Why is 918 not written DCCCCXVIII?
CMXVIII uses the subtractive rule: a smaller symbol placed before a larger one is taken away, so you never repeat a symbol four times. DCCCCXVIII breaks that rule, which is why CMXVIII is the only correct form.
How do you say CMXVIII in words?
CMXVIII is 918, spoken as "nine hundred eighteen". The numeral is read as the single value 918, not as its separate letters.
What are 917 and 919 in Roman numerals?
917 is CMXVII and 919 is CMXIX. Neighbouring numbers often change length in surprising ways, which is why each has its own page.