Print size calculator.

Find out exactly how large you can print from any camera or file. Enter your megapixels to see maximum print sizes, or pick a print size to find out how many megapixels you need.

✓ Free to use 📷 All media types

Print Size Calculator

Know exactly what you can print.

Camera or device

Megapixels

Aspect ratio

Print medium

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Select a camera or enter megapixels
to see what you can print.

Helpful tips

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DPI and PPI mean the same thing here

DPI (dots per inch) is a print term. PPI (pixels per inch) is a screen term. Print stores use them interchangeably in their upload guides; they're referring to the same number. When a lab says "300 DPI minimum," they mean your file needs 300 pixels for every inch of the final print.

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Canvas forgives. Photo paper doesn't.

Canvas prints are viewed from further away and the woven texture naturally softens detail. At 150 dpi it looks genuinely excellent. Photo paper is held at arm's length, so every pixel counts. Don't apply canvas standards to a glossy print order and expect the same result.

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Megapixels aren't everything

A sharp 24 MP file will always outprint a blurry or heavily compressed 48 MP file. Sharpness, noise level, and JPEG compression all affect print quality as much as megapixel count does. If your image looked soft on screen, it will look soft on the wall.

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Upscaling can bridge the gap

If your file falls slightly short of a print size you want, AI upscaling tools like Lightroom's Enhance, Topaz Gigapixel, or Adobe Firefly can add genuine detail, not just stretch pixels. A good upscale from 24 MP to 48 MP can pass a professional print check at 300 dpi.

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Always export at full resolution

Never send a print store a file that was resized for web or social media. Instagram, WhatsApp, and most email clients compress images significantly. Always export directly from your editing software at the highest resolution and set the DPI to 300 in the export settings.

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Export in sRGB unless the lab says otherwise

Most consumer and professional print labs calibrate their printers for the sRGB colour space. If you export in Adobe RGB or ProPhoto RGB without the lab supporting it, colours will print flat and desaturated. Check your lab's colour profile requirements before ordering.

How print size calculation works

It is pixels divided by
inches.

Every digital photo is a grid of pixels. When you send that file to a print lab, their printer has to decide how densely to pack those pixels onto the physical paper. That density is measured in dots per inch, or DPI. The higher the DPI, the more detail per inch, and the sharper the result.

The calculation itself is straightforward: divide the pixel width of your image by the DPI and you get the maximum width you can print at that quality level. A file that is 6000 pixels wide at 300 DPI gives you exactly 20 inches. At 150 DPI that same file covers 40 inches. The pixels have not changed, only how spread out they are on the paper.

What counts as acceptable DPI depends on the print medium and how far away people will stand to look at it. Photo paper is examined up close, so the industry standard is 300 DPI. Canvas has a woven texture that naturally softens detail, making 150 DPI indistinguishable from 300 to the naked eye. A billboard is read from across a road at 72 DPI and nobody notices. The viewing distance is what sets the standard, not an arbitrary rule.

Megapixels are just a shorthand for the total pixel count of a camera sensor. A 24 MP camera captures roughly 24 million pixels, typically arranged in a 3:2 ratio at around 6000 × 4000 pixels. Knowing the megapixels and the aspect ratio is enough to calculate the exact pixel dimensions and, from there, every print size the file can support.

Max print size inches = pixels ÷ dpi

Pixel dimensions w = √(MP × ratio) × ratio

Canvas standard recommended at 150 dpi

Photo paper recommended at 300 dpi

FAQ

Common questions

It depends on the medium and how far away it will be viewed. 300 DPI is the standard for photo paper. It is viewed at arm's length, so every pixel counts. Canvas prints are typically viewed from further away and the woven texture softens detail naturally, making 150 DPI look excellent. Posters and large-format prints intended to be read from across a room can look sharp at 100 DPI or even less. The rule is simple: the greater the viewing distance, the lower the DPI you can get away with.

Technically, DPI (dots per inch) refers to the physical ink dots a printer lays down, while PPI (pixels per inch) refers to the pixel density of a digital image. In practice, print labs and photographers use them interchangeably when talking about image resolution. When a print lab says "upload at 300 DPI," they mean your image file should contain 300 pixels for every inch of the intended print size. This calculator uses DPI in that practical sense, as shorthand for the resolution your file needs.

You have a few options. First, consider whether canvas or a poster medium would work for your image. Their lower DPI requirements mean the same file can print much larger than on photo paper. Second, if the gap is small, AI upscaling tools like Lightroom's Enhance Detail, Topaz Gigapixel AI, or Adobe Firefly can genuinely recover detail rather than just stretching pixels, and a good upscale can pass a professional print check. Third, consider cropping to a smaller print size rather than printing the full frame. Printing a well-cropped section at full quality will almost always look better than printing the full image at the edge of what your file can support.

Megapixel count determines the maximum size you can print at a given sharpness, but it does not guarantee quality by itself. A sharp, well-exposed 24 MP image will outprint a blurry, noisy, or heavily compressed 48 MP image every time. Factors like in-camera sharpness, ISO noise, lens quality, and how the file was exported all affect the final print as much as the pixel count. Use the megapixel number to understand your ceiling, then make sure the image itself is as clean as possible before sending it to print.

Your camera's native aspect ratio is the safest starting point because it uses the full sensor area with no cropping. Most DSLRs and mirrorless cameras shoot 3:2, which maps neatly to 6×4″, 12×8″, and 24×16″ prints. Most phones and some medium-format cameras shoot 4:3, which suits 8×6″ and similar proportions. If you are printing to a standard frame size that does not match your native ratio, such as a square 12×12″ or a 10×8″ from a 3:2 camera, you will need to crop. This calculator accounts for that: enter the exact print dimensions you want and it will calculate the pixels needed for that specific shape.

Yes. Always export at the full pixel dimensions your file has and set the DPI metadata to 300 in your export settings. The pixel count is what actually matters for print size, but setting the DPI value tells the lab's software how to interpret the file. Critically, never send a file that was resized for web or exported for social media. Platforms like Instagram and WhatsApp compress images significantly, often stripping resolution in the process. Always export directly from your editing software, such as Lightroom, Capture One, or Photoshop, at maximum quality.

sRGB is the safe default for most consumer and professional print labs. Their printers are calibrated for sRGB, so exporting in a wider profile like Adobe RGB or ProPhoto RGB without the lab explicitly supporting it will cause colours to print flatter and more desaturated than they appear on screen. If you edit in a wide colour space, convert to sRGB at the point of export. Fine art labs and specialist printers sometimes support Adobe RGB for wider colour accuracy. Always check the lab's colour profile requirements before placing your order.