Skip to main content
CalcFolks
Participant
11月 15, 2026 2:15 午前 UTC
質問

How do I work out the print size in inches of a 3000 × 2000 px image at 300 ppi in Photoshop?

Hi all, I am preparing a photo in Photoshop for print and I want to double-check the maths before I export it. The image is 3000 pixels wide and 2000 pixels high, and the printer has asked for 300 ppi.

 

The calculation is: width in inches = pixels ÷ ppi, so 3000 ÷ 300 = 10 inches. Height = 2000 ÷ 300 = 6.67 inches, about 6⅔ inches. So at 300 ppi the file prints at 10 × 6.67 inches without resampling. If I set the document to 150 ppi instead, the same pixels would cover 20 × 13.33 inches, but with fewer pixels per inch.

 

I used the Pixels to Inches Converter at https://calcfolks.com/pixels-to-inches/ to check both figures. Does that match how you set print size in Image Size in Photoshop?

    返信数 2

    Conrad_C
    Community Expert
    Conrad_CCommunity Expert
    Community Expert
    11月 15, 2026 3:01 午前 UTC

    There is usually no need to go outside Photoshop and retype your specs into to a web site to calculate print size and resolution. It’s built into Photoshop already, where you can do it immediately, using the exact specs and visual feedback straight from the current document.

    In Photoshop you can see print size and resolution in at least two places, and in the same two places, changing the values recalculates the ppi resolution for you:

    Image > Image Size command (IMPORTANT: Resample must be deselected if you want to calculate based on original image pixels.)

     

    Print dialog box, Position and Size section

     

    翻訳
      CORCTON34033231
      Community Expert
      CORCTON34033231Community Expert
      Community Expert
      11月 15, 2026 2:57 午前 UTC

      Hi — yes, your maths is exactly right: 3000 ÷ 300 = 10 inches wide, and 2000 ÷ 300 = 6.67 inches high, so at 300 ppi the file prints at 10 × 6.67 inches without resampling. Your 150 ppi figure is right too — 20 × 13.33 inches, with fewer pixels per inch.

       

      And yes, that matches how you set it in Photoshop: go to Image > Image Size, make sure Resample is turned off, then set Resolution to 300 ppi — the Width and Height will show 10 × 6.67 inches. With Resample off, changing the resolution only changes the print size, not the pixel count.

       

      Adobe's help page on the Image Size dialog explains the settings: https://helpx.adobe.com/photoshop/desktop/crop-resize-transform/resize-adjust-resolution/set-image-size-and-resolution.html

      翻訳
        契約条件Accessibility statement
        Using the community Terms of use Privacy Cookie preferences Do not sell or share my personal information ad choicesAdChoices