43 = XLIII
43 in Roman numerals is XLIII.
Forty-three written with the letters X L I I I.
43 in words: Forty-three
Forty-three in Roman numerals is XLIII. You build it as XL (40) + III (3), writing the larger part first and reading left to right.
Everything in XLIII 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 43 breaks down
Reading XLIII from left to right, each group is added together to reach 43:
| Group | Value | Place |
|---|---|---|
| XL | 40 | tens |
| III | 3 | ones |
| XLIII | 43 | total |
Frequently asked questions
What is 43 in Roman numerals?
43 in Roman numerals is XLIII.
How do you write 43 in words?
43 is written "Forty-three" in English.
What number comes before XLIII?
The number before XLIII is 42, written XLII in Roman numerals.
What number comes after XLIII?
The number after XLIII is 44, written XLIV in Roman numerals.
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Last updated July 22, 2026. Reviewed for accuracy against the standard rules for Roman numerals.