How do you write 45 in Roman numerals?

45 is written as XLV in Roman numerals: 45 = 40 (XL) + 5 (V). The symbols are then written from largest to smallest value.

What does XLV stand for?

XLV stands for the number 45. Reading left to right: XL = 40, V = 5.

How do you write "45th" in Roman numerals?

Ordinal numbers use the same numerals as cardinal numbers, so "45th" is written XLV — Roman notation has no separate ordinal form.

45 in Roman Numerals

How to write the number 45 in Roman numerals, with the full place-value breakdown.

The number 45 in Roman numerals

XLV

Place-value breakdown

45 = 40 + 5, so XLV = XL + V. Roman numerals are written from largest to smallest value, left to right:

Place	Value	Roman	Rule
Tens	40	XL	Subtractive rule: XL = 50 − 10 (a smaller symbol before a larger one is subtracted)
Ones	5	V	Additive rule: V = 5 (symbols are simply added)

About the number 45

The number 45 is written XLV in Roman numerals.

Looking for the ordinal form — "45th in Roman numerals"? Roman notation makes no distinction between cardinal and ordinal numbers, so "45th" is also written XLV.

Convert any number

Number (1-3999)

Roman numeral

XLV