40 in Roman Numerals

XL

XL is a single Roman symbol group for 40. It uses subtractive notation: XL (50 - 10).

How 40 is written in Roman numerals

The number 40 is written XL in Roman numerals. Roman numerals use seven letters — I (1), V (5), X (10), L (50), C (100), D (500) and M (1000) — combined from largest to smallest, with subtractive pairs such as IV (4) and IX (9). Need another number? Use the Roman numeral converter or see the 1–100 chart.

Nearby numbers

XXXVIII38 XXXIX39 XLI41 XLII42

Popular numbers in Roman numerals

IV4 IX9 X10 XLIX49 L50 XC90 XCIX99 C100 D500 M1000 MMXXV2025 ☰1–100 chart ⇄Converter

Frequently Asked Questions

What is 40 in Roman numerals?
40 in Roman numerals is XL.
How do you write 40 in Roman numerals?
Write 40 as XL. Roman numerals are built by adding symbols from largest to smallest, using subtractive pairs like IV and IX where needed.