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Photo pixels to print size at 100 pixels per inch

At the Studio 100 ppi print file rule, pixels needed equal print inches x 100 on each side. A 4 x 6 inch print needs 400 x 600 pixels, 12 x 18 needs 1,200 x 1,800 and 24 x 36 needs 2,400 x 3,600. To check a photo, divide each side in pixels by 100.

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Transcript

Full text of the video, with the source of each claim in square brackets
  1. ArtzFolio Studio print files follow one rule: 100 pixels per inch [PX].
  2. Pixels needed = print size in inches x 100, for the width and for the height: 100 pixels for every 1 inch [PX].
  3. A 4 x 6 inch print needs 400 x 600 pixels, which is 0.24 megapixels [PX].
  4. A 12 x 18 inch print needs 1,200 x 1,800 pixels, which is 2.16 megapixels [PX].
  5. A 24 x 36 inch print needs 2,400 x 3,600 pixels, which is 8.64 megapixels [PX].
  6. To check your own photo, divide each side in pixels by 100. A file of 4,000 x 3,000 pixels gives 40 in by 30 in (40 x 30 in) [PX].
  7. 100 pixels per inch is the ArtzFolio Studio file rule. It is not a statement about how a print looks from any distance [PX].

Key facts

FactDetailSource
Studio rule100 pixels per inchPX
4 x 6 in400 x 600 px (0.24 MP)PX
12 x 18 in1,200 x 1,800 px (2.16 MP)PX
24 x 36 in2,400 x 3,600 px (8.64 MP)PX
Quick checkDivide each side in pixels by 100: 4,000 x 3,000 px = 40 x 30 inPX
Limit of the ruleA file standard, not a statement about how a print looks from any distancePX

Questions

How many pixels do I need for a print?

Under the Studio rule you need 100 pixels for every inch, on both sides. A 12 x 18 inch print needs 1,200 x 1,800 pixels.

How do I find the largest print my photo can make?

Open the file details, note the width and height in pixels and divide each by 100. A file of 4,000 x 3,000 pixels gives 40 x 30 inches.

Is 100 pixels per inch a statement about print quality?

No. It is the ArtzFolio Studio file rule. It does not describe how a print looks from any viewing distance.

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<p>Video: <a href="https://custom.artzfolio.com/videos/photo-pixels-to-print-size/">Photo pixels to print size at 100 pixels per inch</a> by <a href="https://www.artzfolio.com/">ArtzFolio</a></p>

Sources

As of: Rate card as of 2026-11-10; page data as of 2026-11-13. Video published 2026-11-13. The video states only the facts in the transcript above; figures from other sites are paraphrased and each page was read on the date shown in the guide it links to. Always confirm the live price in the studio before ordering.

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