A4 Size - Standard A4 Paper Dimensions

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1. What is A4 paper size and A4 paper dimensions?

2. Standard Pixel Measurements for A4 Paper Size

3. A4 Size Comparison with Other Paper Sizes

A4 is the prevailing paper standard today. From textbooks for students to university course materials and even exam papers, all adhere to the A4 standard. While common in daily life, many readers may still wonder about the dimensions of A4 paper sizes. Let's explore in this article!

1. What is A4 paper size and A4 paper dimensions?

According to ISO standards, the height-to-width ratio of all pages is the square root of two (1.4142:1). In other words, the width and height of a sheet of paper are related to each other as the side and diagonal of a square. If you place two such pages side by side or equivalently cut a diagonal parallel to its shorter side into two equal parts, the resulting pages will have the same width-to-height ratio.

Conversion of A4 Paper Size = 210 x 297 mm = 21 x 29.7 cm = 8.27 x 11.69 inches

2. Standard Pixel Measurements for A4 Paper Size

A4 PPI (Pixel per inch)	Chiều ngang (Pixel)	Chiều dọc (Pixel)
72	595	842
96	794	1123
150	1240	1754
300	2480	3508
600	4960	7016
720	5953	8419
1200	9921	14032
1440	11906	16838
2440	19843	28063
2880	23811	33676

3. A4 Size Comparison with Other Paper Sizes

Khổ giấy	Chiều dọc x Chiều ngang (đơn vị: mm)	Chiều dọc x Chiều ngang (đơn vị: inch)
4A0	1682 x 2378 mm	66.2 x 93.6 in
2A0	1189 x 1682 mm	46.8 x 66.2 in
A0	841 x 1189 mm	33.1 x 46.8 in
A1	594 x 841 mm	23.4 x 33.1 in
A2	420 x 594 mm	16.5 x 23.4 in
A3	297 x 420 mm	11.7 x 16.5 in
A4	210 x 297 mm	8.3 x 11.7 in
A5	148 x 210 mm	5.8 x 8.3 in
A6	105 x 148 mm	4.1 x 5.8 in
A7	74 x 105 mm	2.9 x 4.1 in
A8	52 x 74 mm	2.0 x 2.9 in
A9	37 x 52 mm	1.5 x 2.0 in
A10	26 x 37 mm	1.0 x 1.5 in

Through this article, we hope you gain additional insights into A4 paper – the most common and frequently encountered paper size in daily life. Thank you for reading this article by Mytour. If you found it helpful and informative, feel free to leave your comments and feedback below!

Frequently Asked Questions

What are the exact dimensions of A4 paper size?

The dimensions of A4 paper size are 210 mm in width and 297 mm in height. This translates to 21 cm by 29.7 cm or approximately 8.27 inches by 11.69 inches. These measurements make A4 the standard size for various documents.

How does A4 paper size compare to other common paper sizes?

A4 paper size is 210 mm by 297 mm, which is larger than A5 and smaller than A3. For instance, A3 measures 297 mm by 420 mm, while A5 measures 148 mm by 210 mm. This makes A4 versatile for various uses, including printing and writing.

What is the aspect ratio of A4 paper size according to ISO standards?

The aspect ratio of A4 paper size is based on the square root of two, specifically 1.4142:1. This ratio ensures that when an A4 page is divided or combined with another, the resulting pages maintain the same width-to-height proportions.

What are the standard pixel measurements for A4 paper size at different PPI?

Standard pixel measurements for A4 paper size vary by PPI. For example, at 300 PPI, the dimensions are 2480 pixels in width and 3508 pixels in height. This is crucial for ensuring high-quality prints and digital displays.

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