18 in Roman Numerals
18 = XVIII
18 is written XVIII in Roman numerals.
Step by step
- Split 18 into place values: 10 + 8.
- 10 = X
- 8 = VIII
- Join them from largest to smallest: XVIII.
To read XVIII back, go from left to right and add each value, treating a smaller symbol before a larger one as a single subtracted pair: X (10) + V (5) + I (1) + I (1) + I (1) = 18.
Details
- Symbols used
- X = 10, V = 5, I = 1
- Roman numeral
- XVIII
- Breakdown
- X + VIII
- Number of symbols
- 5
- Lowercase
- xviii
- Uses subtraction
- No
How it works
Roman numerals combine seven symbols — I (1), V (5), X (10), L (50), C (100), D (500) and M (1,000). Write each place value of the number separately, from thousands down to ones, and join the results. Six subtractive pairs replace four repeated symbols: IV (4), IX (9), XL (40), XC (90), CD (400) and CM (900). No symbol appears more than three times in a row.
Nearby values
Related conversions
Frequently asked questions
What is 18 in Roman numerals?
XVIII.
How do you write 18 in Roman numerals?
Break it into X (10) + VIII (8) and write XVIII.
What number is XVIII?
XVIII = 18.
What is the largest standard Roman numeral?
3,999, written MMMCMXCIX.