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There is a powerful numeric logic behind the European paper sizes. They have 3 basic sheets, named A, B and C. These are then folded (halved along the longest side) to give A1, A2, A3 etc for the A0 sheet size. The A0 has an area of 1 square metre.

The clever mathematics of the height to width (aspect ratio) is achieved by using the 'magic' number, √2 or 1.414… Those who remember Pythagoras' Theorem about the length of the hypotenuse being equal to the sum of the squares of the other 2 sides will see that 1² + 1² =2.  So with √2 as the length of the other side you will get 2 pieces with sides that are the same length.

The chart below lists the common book page size aspect ratios. If you are a perfectionist you can adjust the margins to match the paperback size you want. (More about book sizes)

B series - B sizes

Untrimmed metric paper sizes for posters and charts.(mm)

C series - C sizes

Metric sizes used in envelopes.(mm)

Paper quantity units used in printing:

Word count  Preparing a mock-up Page size  Preparing a mock-up Print sizes  Book sizes

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