42 = XLII
42 in Roman numerals is XLII.
Forty-two written with the letters X L I I.
42 in words: Forty-two
Forty-two in Roman numerals is XLII. You build it as XL (40) + II (2), writing the larger part first and reading left to right.
Everything in XLII is additive here, so you simply add each letter's value together. Numbers like this are a good place to get comfortable before tackling the subtractive forms such as IV and IX.
How 42 breaks down
Reading XLII from left to right, each group is added together to reach 42:
| Group | Value | Place |
|---|---|---|
| XL | 40 | tens |
| II | 2 | ones |
| XLII | 42 | total |
Frequently asked questions
What is 42 in Roman numerals?
42 in Roman numerals is XLII.
How do you write 42 in words?
42 is written "Forty-two" in English.
What number comes before XLII?
The number before XLII is 41, written XLI in Roman numerals.
What number comes after XLII?
The number after XLII is 43, written XLIII in Roman numerals.
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Last updated July 22, 2026. Reviewed for accuracy against the standard rules for Roman numerals.