A4 (mm) to US Letter (mm) Converter
Convert A4 (mm) to US Letter (mm) instantly with a reference conversion table.
| A4 (mm) | US Letter (mm) |
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How to convert A4 (mm) to US Letter (mm)
Enter your value
Type the number of a4 (mm) you want to convert into the left box. The result in us letter (mm) appears instantly in the right box. You can also type into the right box to convert in the other direction.
Use the swap button
Click the ⇄ Swap button to reverse the conversion — US Letter (mm) to A4 (mm). Your current value carries across so you don't have to re-enter anything.
About A4 (mm) and US Letter (mm)
A4 (mm) and US Letter (mm) are common paper measurements.
A4 (210×297mm) vs US Letter (216×279mm): A4 is narrower but taller. A4 is 6mm narrower and 18mm taller. When printing A4 content on Letter paper: the content fits width but gets cropped at the bottom. Margins should be set to at least 25mm (1") to ensure all content fits on either format.