Home » Articles » Post-Processing » The complete guide to standard photo sizes

The complete guide to standard photo sizes

by David Em
Last updated:

Portraits Refined may earn a commission on purchases made from links on this page. For more information, read Affiliate Disclosure.

When you print a photo, it goes from digital to physical. Whether it’s for your wall or a gift, photo prints add personality and happiness.

Estimated reading time: 4 minutes

Close-up of a person's hand as they hand an image.

Aspect ratio

The aspect ratio is the ratio of the image’s width to its height. It’s expressed by two numbers with a colon or “x” between them. For example, a 4 by 3 ratio would be expressed as 4:3 or 4×3.

Related: Best Lightroom export settings for Instagram

Although there are many options regarding the aspect ratio or print size, the following are the most common and popular choices:

  • 4×6
  • 5×7
  • 8×10
  • 10×10
  • 10×13
  • 10×20
  • 11×14
  • 16×20
  • 20×24
  • 20×30

When you’re out shooting, keep in mind that your photos may be cropped depending on the aspect ratio for printing. Therefore, it’s important to allow space for cropping.

Related: Matte vs. glossy photos: Which is best for photo prints?

If you’re using international print sizes (ISO), it’ll start with an “A” (for series A).

The largest size is A0, which is one square meter. Each number after that is half of the size of the previous one. The following are the sizes in inches:

  • A0: 33 in x 46.81 in
  • A1: 23.39 in x 33 in
  • A2: 16.54 in x 23.36 in
  • A3: 11.69 in x 16.54 in
  • A4: 8.27 in x 11.69 in
  • A5: 5.83 in x 8.27 in
  • A6: 4.13 in x 5.83 in
  • A7: 2.91 in x 4.13 in

Related article: How to resize an image in Photoshop

Pixel width

When you export an image for printing, you must understand the outcome beforehand. Figure out what size the image will print at because it’ll determine how you export it.

For example, if you’re printing a 4 inches by 4 inches image at 300 PPI, it’ll be 1,200 pixels x 1,200 pixels. Each inch will have 300 pixels. Therefore, you’d multiply 300 by 4.

Related: What’s the difference between DPI and PPI?


It’s common to use PPI and DPI interchangeably. However, they’re different because DPI has to do with a printer setting.

PPI stands for pixels per inch, while DPI stands for dots per inch. PPI describes the resolution of a digital image in pixels, while DPI describes the number of ink dots on a printed photo.

When it comes to printing a photo, the minimum PPI is 300. The more pixels per inch, the finer the details will be in the printed image. 300 DPI is also the standard printer setting for images.

Frequently asked questions

Is 72 pixels per inch considered high-resolution?

72 PPI is great for online images, as it’s considered screen resolution. However, it’s not good enough for photo prints because it won’t be as detailed.

How do you print small pictures?

Small pictures are known as wallet-sized prints, which are usually a couple of inches in size. Most wallet-size prints have an aspect ratio of 4×6, 1×1, or 5×7.

Where can I print photos?

There are plenty of options when it comes to photo printing services. The following are the best online and physical places to print your photos: Shutterfly, Walmart Photo, Walgreens Photo, Amazon Print, Snapfish, Nations Photo Lab, CVS Photo, Printique by Adorama, or Mpix.


Printing a photo is a great way to print a memory or moment. Understanding how printing works, and the sizes will help you with exporting and cropping the images.

More resources:

Featured image courtesy of Pexels.

About David Em

David Em.

David Em is the founder of Portraits Refined. He’s a published portrait photographer dedicated to helping photographers develop skills, capture incredible photos, and build successful businesses.

About Portraits Refined

Portraits Refined (PR) is a media company that publishes the latest expert-backed portrait photography tips, in-depth camera gear reviews, and helpful advice to grow your photography business.