Paper Sizes – USA & UK Ultimate Guide

Understanding paper size is important whether you’re printing documents, designing artwork, or creating presentations. This definitive guide will help you navigate the different paper sizes used in the UK and USA, providing charts and explanations for easy reference.

What are the UK/international paper sizes?

uk paper sizes

In the UK and many other parts of the world, paper sizes follow the ISO 216 standard, which includes the A series, B series, and C series. The A series is most commonly used for regular printing and office use. The sizes are based on a logical system where each size is half of the previous size when added parallel to its shorter sides.

UK Paper Sizes Chart with Table

The UK and international paper sizes are standardized under the A series. Here’s a quick reference chart:

SizeDimensions (mm)Dimensions (inches)
A0841 x 118933.1 x 46.8
A1594 x 84123.4 x 33.1
A2420 x 59416.5 x 23.4
A3297 x 42011.7 x 16.5
A4210 x 2978.3 x 11.7
A5148 x 2105.8 x 8.3
A6105 x 1484.1 x 5.8

What Size is A3 Paper?

A3 paper measures 297 x 420 mm, or 11.7 x 16.5 inches. It’s often used for larger documents such as posters, charts, and presentations. A3 paper provides more space for detailed information and graphics.

What size is A4 paper?

A4 paper is the standard size for most documents, measuring 210 x 297 mm, or 8.3 x 11.7 inches. It is commonly used for letters, forms, and everyday printing tasks. A4 is the paper size used in offices and schools.

What size is A5 paper?

A5 paper is 148 x 210 mm, or 5.8 x 8.3 inches. This size is often used for booklets, brochures, and notepads. A5 paper is basically an A4 sheet folded in half, providing a convenient size for smaller documents.

What are the US paper sizes?

us paper sizes

In the USA, paper sizes follow a different standard primarily administered by the American National Standards Institute (ANSI). The most common sizes include letters, legal, and ledger/tabloid.

US Paper Size Chart with Table

Here’s a handy chart for US paper sizes:

SizeDimensions (inches)Dimensions (mm)
Letter8.5 x 11216 x 279
Legal8.5 x 14216 x 356
Tabloid11 x 17279 x 432
Ledger17 x 11432 x 279

The Letter size (8.5 x 11 inches) is the most commonly used for everyday printing, similar to A4 in the international system. Legal size is longer, useful for contracts and legal documents. Tabloid and Ledger are larger, providing more space for designs and large documents.


Whether you’re in the UK, USA, or elsewhere, understanding paper sizes can greatly improve your printing projects. This guide offers a clear comparison between UK ISO standard paper sizes and US ANSI standard sizes, ensuring you can choose the right paper for any job. With this knowledge, you can confidently navigate paper sizes for any project or professional need.


What is the most common paper size used in the UK?

The most common paper size used in the UK is A4, which measures 210 x 297 mm (8.3 x 11.7 inches).

How do UK paper sizes compare to US paper sizes?

UK paper sizes are based on the ISO 216 standard, while US sizes follow the ANSI standard. A4 is the closest UK size to the US Letter size.

What paper size is commonly used for legal documents in the US?

Legal size paper, measuring 8.5 x 14 inches, is commonly used for legal documents in the US.

Is A3 paper size larger than Tabloid paper size?

No, A3 paper measures 297 x 420 mm (11.7 x 16.5 inches), while Tabloid paper measures 11 x 17 inches (279 x 432 mm), making Tabloid slightly larger.

Can I use A4 paper in a US printer?

Yes, you can use A4 paper in a US printer, but you may need to adjust the printer settings to accommodate the different size.

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