Paper Size Converter
Converts common paper standards like A-series and Letter into mm or inches.
Lilu Baba's Paper Size Converter gives exact dimensions for the most common international (A-series) and US paper standards.
How to use this calculator
- Choose a paper size standard.
- Choose millimetres or inches.
- Its dimensions update instantly.
Width
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Height
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FAQ
Paper Size Converter — frequently asked questions
A4 (210×297mm) is the international standard; US Letter (215.9×279.4mm) is slightly wider and shorter, used mainly in the US and Canada.
Each A-size is exactly half the area of the one before it when cut along its longer dimension, preserving the same aspect ratio throughout the series.