A4 sheet size in pixels

The number of pixels in a sheet of A4 format, A4 size for Photoshop

It is used everywhere: in the post office, in the hospital, at home, in art schools, factories and institutes. A4 format is simply irreplaceable in the modern world. A4 sheet has convenient, or maybe just familiar to most of us, dimensions. It is with this parameter that we will try to figure it out.

Size of A sheets

As you know, all A-size paper is produced according to the ISO216 standard and has a strict length-to-width ratio. It all starts with the A0 format taken as the standard. The area of ​​the sheet A0 is 1 m2, and its dimensions are 84.1x118.9 cm . Then everything is arranged like this: the length of a sheet of a smaller format is equal to the width of a sheet of a larger format, and the width of a smaller sheet is equal to half the length of a larger sheet. At first glance, it seems that this is not so easy, but looking at the table below, this dependence can still be caught.

A4 sheet size in pixels

As it turned out, everything is simple with the physical dimensions of A4 sheet, but what to do if you need to know the “virtual” size. Indeed, many graphic editors, for example, “Photoshop” / “Corel Draw” require setting the size of the image in pixels, for example, if you need to change it, or print it. In fact, this is not necessary, but now is not about that, otherwise this text will not be about A4 format, but about Photoshop. Still, you need to find out how many pixels will fit on an A4 page . In fact, as much as you like.

Pixel / pixel — the lowest logic element two-dimensional digital image, bitmap graphics, or [physical] matrix display element forming the image. A pixel is an indivisible rectangular or circular object characterized by a specific color.

Key words: display matrix element. What does the “element of the display matrix” have to do with the natural, if I may say so, sheet size, be it A4, A3, A0 or any other? In fact, the most direct. Let’s say you took a photo on your smartphone, and then decided to immortalize it in a frame on the wall. Of course, in order to do this, you just absolutely need to print this photo. Of course, you have two ways:

The simplest, and perhaps the most correct. You just give the photo for printing to the nearest printing house.

You wouldn’t be reading this article if you preferred the first method. Therefore, you see, you are the lucky owner of a printer that can print high-quality photos. But back to the pixel. After uploading a photo from a smartphone to a computer, it turns out that the photo has another very important parameter — dpi

This is a complex abbreviation for English. dots per inch , in other words, the number of dots per inch, and dots mean the same pixels that are written above. Now we have already come close to the answer about the number of pixels in A4 sheet. We open Photoshop, go to the image settings and see that the resolution of your image is 150 dpi, and the image size is, say, 437x620 pixels. Looking a little ahead, this means your image will actually look great on page A7. Typically, three types of permissions are used in printing, so to speak:

Resolution 75 dpi is usually used for printing a picture that consists entirely of text, such as this article. The resolution of 150 dpi is already suitable for printing images , it is usually used by document scanners, it allows you to print a picture in sufficient quality to display details, even a color one. Still, for full-fledged printing of images, a resolution of 300 dpi and higher is usually used. Naturally, we are talking about raster graphics.

So where do these strange numbers and pixel values ​​that nobody understands come from? Very simple! These values ​​are deduced by simple calculation.

First, let’s translate the dimensions of our page into inches:

A4 page width 210 mm = 8.27 inches;

A4 page height 297 mm = 11.69 inches.

It is known for certain that 1 inch is 25.4 mm.

Thus, at a resolution of 300 dpi, the calculation will look like this:

width: 8.27x300 = 2480 px;

height: 11.69x300 = 3508 px,

where: 8.27 / 11.69 is the width / height of the A4 page in inches, and 300 is the number of pixels per inch.

The calculation can be slightly simplified by bringing it to the following form:

width: 210x300 / 25.4 = 2480 px;

height: 297x300 / 25.4 = 3508 px.

Based on this, the size of an A4 sheet in pixels with a resolution of 300 dpi will be equal to 2480x3508 px. The calculation will look similar with other formats. Naturally, having the Internet at hand, it would be rather strange to calculate the pixels that fit into a page of one format or another every time. Below is a table in which everything has already been calculated.

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