The Roman numeral for 40 is XL. Break 40 into thousands, hundreds, tens and ones to see why. The converter below turns any number into Roman numerals and back.
40 as a Roman Numeral
XL is a single block of symbols that equals 40.
Roman numerals also number book chapters, outlines, and the names of kings and popes.
Free Roman Numeral Converter
How 40 Breaks Down
| Place | Value | Roman |
|---|---|---|
| Tens | 40 | XL |
| Total | 40 | XL |
Write the parts in order from largest to smallest to get XL.
The Rules That Make XL
| Symbol | I | V | X | L | C | D | M |
|---|---|---|---|---|---|---|---|
| Value | 1 | 5 | 10 | 50 | 100 | 500 | 1000 |
- Add symbols from largest to smallest: VI = 5 + 1.
- Repeat I, X, C or M up to three times: XXX = 30.
- Put a smaller symbol before a larger one to subtract: IV = 4, IX = 9.
In XL, the subtractive pair is XL = 40.
40 and the Numbers Around It
| Number | Roman numeral |
|---|---|
| 36 in Roman numerals | XXXVI |
| 37 in Roman numerals | XXXVII |
| 38 in Roman numerals | XXXVIII |
| 39 in Roman numerals | XXXIX |
| 41 in Roman numerals | XLI |
| 42 in Roman numerals | XLII |
| 43 in Roman numerals | XLIII |
| 44 in Roman numerals | XLIV |
See the full list in the Roman numerals chart.
FAQs About 40 in Roman Numerals
What is 40 in Roman numerals?
40 in Roman numerals is XL.
What is XL as a number?
XL equals 40.
How do you write 41 in Roman numerals?
41 in Roman numerals is XLI.
Is XL a valid Roman numeral?
Yes. XL follows the standard rules: symbols run from largest to smallest, and only valid subtractive pairs appear.
The Short Version
40 is XL. Split the number into thousands, hundreds, tens and ones, write each part, and join them in order.
