How many inches is a5?

A5 paper measures 14.8 cm x 21.0 cm (5.8 inches x 8.3 inches). This size belongs to the A series paper, based on the format ratio 1.414:1, and is commonly used for notebooks, letterheads, flyers, brochures and matching C5 envelopes. The A series also includes other sizes such as A4 (twice the size of the A5), A6 (half the size of the A5), and A7 (a quarter of the size of the A5).

What is the A5 paper size?

A5 paper measures 14.8 cm x 21.0 cm (5.8 in x 8.3 in).

The origin of A5 paper size

A5 paper size belongs to the A series of paper sizes defined by the International Organization for Standardization (ISO). A Series papers are based on a specific ratio called the format ratio, which is the square root of length to width. For A-series papers, the format ratio is approximately 1.414. This means that the length to width ratio of each A Series paper is 1.414:1.

A5 paper size is widely used in various occasions, including:

Notebook:
• A5 paper is a common size for notebooks.
Letter:
• A5 paper is sometimes used for informal letters and notes.
Flyers:
• A5 paper is an affordable flyer size.
Booklet:
• A5 paper can be folded into a booklet for easy portability and distribution.
Envelopes:
• A5 paper can be placed in C5 envelopes.

The A series also defines other paper sizes, related to the A5 paper size:

A4:
• Twice the size of A5 paper, measuring 21.0 cm x 29.7 cm (8.3 in x 11.7 in).
A6:
• Half the size of A5 paper, measuring 10.5 cm x 14.8 cm (4.1 in x 5.8 in).
A7:
• One-quarter the size of an A5 paper, measuring 7.4 cm x 10.5 cm (2.9 in x 4.1 in).

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