159 in Roman Numerals
One hundred fifty-nine is written CLIX 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 CLIX is formed
Reading left to right, 159 breaks into these additive parts. Each Roman symbol is added in turn to reach the total.
C + L + IX = 100 + 50 + 9 = 159.
Where 159 in Roman numerals is used
- Monarch and pope names, for example the 159th of a royal line.
Convert another number
159 is written CLIX in Roman numerals.
Frequently asked questions
How do you write 159 in Roman numerals?
Write 159 as CLIX, combining C + L + IX. Start from the largest value that fits and work down until nothing is left over.
Why is 159 not written CLVIIII?
CLIX uses the subtractive rule: a smaller symbol placed before a larger one is taken away, so you never repeat a symbol four times. CLVIIII breaks that rule, which is why CLIX is the only correct form.
What are 158 and 160 in Roman numerals?
158 is CLVIII and 160 is CLX. Neighbouring numbers often change length in surprising ways, which is why each has its own page.
How is CLIX broken down?
CLIX breaks down as C (100), L (50), IX (9), so C + L + IX = 100 + 50 + 9 = 159.