Paper Size Converter

A Series, B Series and US Paper Sizes

Find paper dimensions in mm and inches. Compare sizes across different international standards.

How to Use

Select Series
Choose A series, B series, or US paper sizes.
Select Size
Pick the specific paper size you need.
View Dimensions
See dimensions in millimeters and inches with visual preview.

Select Paper Size

Size	Width (mm)	Height (mm)	Width (in)	Height (in)

When printing documents for international use, know the correct paper size for the target country.

Designers need exact dimensions when creating print materials for different paper standards.

When ordering paper or envelopes from overseas, verify the correct size equivalents.

Paper sizes are standardized differently around the world. The ISO A and B series are used internationally, while the US has its own system.

The A series is based on a 1:√2 aspect ratio. A0 has an area of 1 square meter. Each smaller size is half the previous one.

US paper sizes like Letter (8.5×11 in) and Legal (8.5×14 in) are commonly used in North America.

What's the difference between A4 and Letter?

A4 (210×297mm) is slightly narrower and taller than US Letter (216×279mm). A4 is the international standard.

Which paper size is most common?

A4 is the most common worldwide. In the US and Canada, Letter size is standard for everyday documents.

What is the B series used for?

B series sizes fall between A sizes and are often used for posters, books, and passports.

Can I print A4 documents on Letter paper?

Yes, but you may need to scale the document. The content might be slightly shrunk or cropped.

What's the aspect ratio of A series paper?

All A series papers have a 1:√2 (approximately 1:1.414) aspect ratio, allowing consistent scaling.

Which size should I use for international documents?

A4 is recommended for international documents as it's the standard in most countries outside North America.