18 in Roman Numerals
18 in Roman numerals is XVIII. It is built from two parts: 10 + 8 = X + VIII. Read it from left to right and add the values to get 18. Copy it below, see why it is written this way, and check the numbers before and after. The converter handles any number from 1 to 3,999.
18 in Roman numerals is XVIII.
18 in Roman numerals: the breakdown
| Place value | Numeral | Value |
|---|---|---|
| 10 | X | 10 |
| 8 | VIII | 8 |
| Total | XVIII | 18 |
10 plus 8 is 18, so X followed by VIII is XVIII.
How to read XVIII
- X is 10.
- VIII is 5 + 1 + 1 + 1, which is 8.
- Add 10 + 8 to get 18.
The numbers around 18
Facts about 18
- 18 is an even number.
- 18 is not prime: 18 = 2 x 3 x 3.
- The digits of 18 add up to 9.
- XVIII is 5 letters long. It uses the symbols X, V and I.
Convert another number
18 = 10 + 8 = X + VIII
What number is XVIII?
XVIII is the number 18. Reading it from left to right, X is 10 and VIII is 8, which adds up to 18.
Questions and answers
What is 18 in Roman numerals?
18 in Roman numerals is XVIII. It is made of two parts: 10 + 8 = X + VIII. Read XVIII from left to right, add the parts, and you get 18. Use the converter on this page to check any other number from 1 to 3,999.
How do you write 18 in Roman numerals?
Split 18 into its place values, write each one in Roman numerals, and join them from largest to smallest. For 18 that is 10 + 8, which is X + VIII, so the answer is XVIII. Check that no letter repeats more than three times in a row.
What number is XVIII?
XVIII is 18. Read it in place-value parts from left to right: X is 10, VIII is 8. Add the parts to get 18. Letters after a larger or equal letter are added, and a smaller letter before a larger one is subtracted. You can also type XVIII into the converter to read the number back.