This pixels to print size calculator will help you determine the print size of any image file at any pixel density or number of pixels per inch. This calculator also works the other way around if you need to know the image pixel dimensions when printing standard photo sizes.
If you've ever had to send pictures to a printing facility only to find out your prints came out pixelated and almost unusable for its intended purpose, worry no more because we've got you covered! In this calculator, you will learn the appropriate pixel per inch for prints that will be viewed at a specific viewing distance, so that when you have your photo printed, it will come out as beautiful as you planned.
You will also learn what pixel density best suits various standard print sizes and standard poster sizes, which we will also show in our picture size chart below.
What is pixel density?
In most image editing and rendering software, we are given the option to either input our desired image file dimensions in pixels, our planned actual print dimensions, or the pixel density of our project. Pixel density, as the name "density" suggests, is the amount of pixels in a given area. Since we can measure an image's dimensions using anything (for example, bananas), might as well use one line of pixels as a unit (of measurement), such as an inch or a centimeter for our arbitrary area, as we mentioned earlier.
With that said, we can then set our units for pixel density as either pixels per inch or pixels per centimeter. For now, to simplify this text, let us consider the more common pixels per inch, or PPI, when dealing with pixel density. You can also check out the PPI definition in our PPI calculator to learn more about the pixels per inch unit of measurement. Here is an illustration of a 50 PPI image to understand pixels per inch even further:
In the illustration above, we can see that the image shown has 50 pixels for every inch of the picture. This pixel density of 50 PPI is suitable for large format prints, like posters and billboards, wherein they are viewed from far away. If we get closer to these prints, especially at even lower pixel densities, we might not readily recognize what is being shown because we'll already start to see a large grid of square boxes.
On the other hand, pixels per inch for prints at smaller formats (like for ones we view at an arm's length and can use in picture frames and photo albums) need a pixel density of at least 180 PPI to achieve good results. However, if we want an excellent quality print that we can inspect really close-up, we can opt for a picture of at least 300 PPI, the industry standard for making prints. You can use the table of pixel densities suitable for prints depending on their viewing distances below as a guide:
Using these minimum pixel densities would already give you high-quality prints. If we need to print very intricate designs or very detailed pictures, we can go for higher pixel density values. However, this would result in a higher file size or longer printing times. On the other hand, using lower pixel densities than the ones in the table could help you save some storage space. However, it could result to low quality prints. We recommend that you always take pictures or create images at higher resolutions so that it can be used for both viewing near and far.
Standard print sizes
Aside from these standard minimum pixel densities for specific viewing distances, prints also follow some standards when it comes to print sizes. Following these standard photo sizes and standard poster sizes means that manufacturers can also create standard sizes for plain and photo papers, picture frames, albums, tarpaulins and so much more.
Having these sizes means that we can set our projects using these measurements and be sure we will have them printed easily. In this calculator, we have some standard paper sizes ready for you to choose from for your convenience:
Below are also some picture size charts for your reference, the first one is for standard poster sizes and the second one is for standard photo sizes:
Sample computations with pixel density
Using our pixel to print size calculator, solving the print size dimensions at a given pixel density and image pixel dimensions becomes a breeze. Doing it manually is also quite easy. All you have to do is divide the image's dimensions (in pixels) by the image's pixel density.
For an example, let us consider an image file with a pixel density of 300 PPI, a width of 3600 pixels, and a height of 4800 pixels. Given that our pixel density is in pixels per inch, we can directly solve the print dimensions in units of inches. Let us divide the dimensions separately by the pixels density, as shown below:
print width = image width in pixels / pixel density
print width = 3600 pixels / 300 pixels per inch
print width =
print height = image height in pixels / pixel density
print height = 4800 pixels / 300 pixels per inch
print height =
From the computation above, we can now say that we can print the image file up to a print size of 12" x 18" without compromising the image quality.
On the other hand, to calculate the required image file dimensions (in pixels) for a standard photo size or a specific print size at a desired pixel density, we just have to multiply the print width and print height by the pixel density separately, as shown in the equations below:
image width in pixels = picture width * pixel density
image height in pixels = picture height * pixel density
If you like taking pictures and plan to have them printed right away and you need to save some storage space, you can use the equations above to know the minimum camera resolution you need for your desired print size. Let's say we want to print our pictures on sheets of 2R wallet-sized photo paper.
For this print, we can go for the 180 PPI pixel density. By multiplying 180 PPI by the print dimensions of a 2R photo paper, which is 2.5" x 3.5", we get our required image dimensions in pixels of 450 pixels x 630 pixels. We can also express these values in camera megapixels by multiplying them together to come up with 283,500 pixels or 0.28 megapixels, which we can usually see in our camera settings. You can also learn more about this in the How to calculate image file size? section of our image file size calculator.
How to use our pixels to print size calculator?
With our pixel to print size calculator, you can do three things. You can:
- Determine the maximum print dimensions of an image file if you know its pixel density;
- Calculate the required image pixel dimensions for a specific print size to be viewed at a certain distance; and
- Solve the pixel density of a photo print if you know both its dimensions in pixels and its print dimensions.
In our pixel to print size calculator, selecting the viewing distance will display the recommended pixel density for that distance.
However, if you have a specific pixel density in mind, you can also just input the pixel density for custom calculations. When you already have your desired pixel density entered into the calculator, you can either select a standard print size or input your preferred print dimensions. By doing this, the image pixel dimensions will automatically be displayed. Entering values on the print dimensions after placing a value for pixel density will solve the image dimensions.
If you have both print and image dimensions and you want to know what pixel density your image has, you first have to unlock the pixel density variable in our calculator. Just click on to the padlock icon on the Pixel density row and then select "lock." Also, don't forget to choose the appropriate units for each calculation you make.
Want to learn more?
Translating image file dimensions to print size and vice versa is quite like applying a scale factor to these measurements. You can check out our scale calculator if you want to expand your knowledge about this topic. You can also check our pixels to inches converter if you need to convert screen sizes to pixel measurements, and vice versa.