3×5 Picture Size: Inches, Pixels and Correct Crop Ratios

A literal 3 × 5 inch picture measures 7.62 × 12.7 cm. In portrait orientation its aspect ratio is 3:5, and an export at 300 pixels per inch (PPI) is 900 × 1500 pixels. For landscape, reverse the dimensions: 5 × 3 inches, ratio 5:3, and 1500 × 900 pixels.

Before cropping, check the print order. 3.5 × 5 inches is a different size, requiring a different crop and 1050 × 1500 pixels at 300 PPI. Do not assume that a label such as “3x5” identifies the exact paper or frame size.

3 × 5 versus 3.5 × 5: confirm the physical size

Use the dimensions in the lab's product specification, not a shorthand name. For example, Nations Photo Lab sells a 3.5 × 5 inch print and lists 1050 × 1500 pixels for its best-quality file target. That is not a literal 3 × 5 print.

The two portrait formats are:

• 3 × 5 inches: 7.62 × 12.7 cm; ratio 3:5; 900 × 1500 pixels at 300 PPI.
• 3.5 × 5 inches: 8.89 × 12.7 cm; ratio 7:10; 1050 × 1500 pixels at 300 PPI.

If a listing uses a name such as “3R,” check its stated inch or millimeter dimensions. Do not interpret the “3” as proof that the short edge is exactly three inches.

Before exporting, confirm the finished paper size, portrait or landscape orientation, and whether the customer wants an edge-to-edge crop or the whole image with borders. For a frame, check both the size of print it accepts and the visible opening; the frame lip or mat can cover part of the picture.

Convert inches to pixels using PPI

The calculation for each side is pixels = inches × PPI. For a portrait 3 × 5 print at 300 PPI, that gives 3 × 300 = 900 pixels wide and 5 × 300 = 1500 pixels high.

These are calculated file dimensions, not promises of print quality:

Literal 3 × 5 inches

• At 150 PPI: 450 × 750 pixels.
• At 240 PPI: 720 × 1200 pixels.
• At 300 PPI: 900 × 1500 pixels.

3.5 × 5 inches

• At 150 PPI: 525 × 750 pixels.
• At 240 PPI: 840 × 1200 pixels.
• At 300 PPI: 1050 × 1500 pixels.

Use your lab's requested density and file specifications. More source pixels can give you room to crop, but focus, motion blur, compression and the original detail still affect the result. Merely enlarging a small file to the listed dimensions does not recover missing detail.

PPI, printer DPI and screen size are different

PPI describes image pixels per printed inch. DPI describes printer dots per inch. Labs sometimes use “DPI” when discussing an image file, so check whether the request actually refers to image resolution. A printer's advertised DPI is not a request to export that many image pixels per inch.

Changing resolution metadata without resampling leaves the pixel count unchanged. For example, a 900 × 1500 pixel file represents 3 × 5 inches at 300 PPI or 6 × 10 inches at 150 PPI. Adobe explains the distinction between resizing and resampling.

A “72 DPI” label does not make a file suitable for the web, and “600 DPI” does not make a print archival. For screens, choose the required pixel dimensions and suitable compression. For printing, calculate the density at the actual output size and follow the lab's instructions.

Match the aspect ratio before resizing

3 × 5 is not 3:2. A landscape 3:2 file matches a 6 × 4 print, but neither a 5 × 3 nor a 5 × 3.5 print has that shape. Check the dimensions of the file you are exporting, especially if it has already been cropped.

For a 3:2 landscape source, an edge-to-edge 5 × 3 print requires a 5:3 crop. If you keep the full width, you remove some of the top and bottom. A 5 × 3.5 print requires a 10:7 crop; keeping the full height removes some of the sides instead.

For a concrete example, start with a 6000 × 4000 pixel landscape file:

1. For a 5 × 3 inch print, crop to 6000 × 3600 pixels, then export at 1500 × 900 pixels for 300 PPI. A centered crop removes 200 pixels from both the top and bottom before resizing.
2. For a 5 × 3.5 inch print, one exact 10:7 crop that fits inside the source is 5700 × 3990 pixels. Export at 1500 × 1050 pixels for 300 PPI. The slight height reduction allows an exact whole-pixel ratio.

These are arithmetic examples, not a requirement to use those source dimensions. In your editor, set the intended ratio, reposition the crop, and inspect heads, hands, text and other important details near every edge. Never stretch the image to force both dimensions to fit.

Keep the whole image by adding borders

If cropping removes something important, fit the whole image inside a canvas with the required print ratio and add borders. For example, a 3:2 landscape image fitted within a 5 × 3 inch print occupies 4.5 × 3 inches, leaving a quarter-inch border at each side when centered.

Tell the customer that borders are intentional, and choose the lab's setting that preserves them. Review the ordering preview; an automatic fill option can crop away the borders you added.

Check bleed, borderless printing and frame fit

Bleed is image area beyond the intended trim edge. Add it only when the printer's specification or product template requires it. Do not invent a universal bleed allowance for every small photo print.

Before ordering, check:

• Lab cropping: Does the order preview preserve your crop, or does it enlarge the image to fill the paper?
• Borderless output: Does the selected paper size and printer mode support it, and does the printer enlarge the image at the edges?
• Frame coverage: Which details will the lip or mat hide? Keep essential content away from that covered area.
• Paper versus opening: A visible opening can be smaller than the paper it holds. Check the frame's accepted print size as well as measuring the opening.

For a close-fitting frame or an important order, make a sample print using the intended lab or printer and check it in the actual frame. The digital crop preview cannot establish physical trim accuracy.

Crop, resize and export a print file

Keep the original file, then work on a separate export:

1. Confirm the order: Write down the exact inches, orientation and border choice.
2. Set the crop: Use 3:5 or 5:3 for a literal 3 × 5; use 7:10 or 10:7 for 3.5 × 5. Inspect the edges before applying it.
3. Set output dimensions: At 300 PPI, use 900 × 1500 or 1050 × 1500 pixels in portrait orientation. Reverse them for landscape. If the lab requests a different density, recalculate both sides.
4. Follow file and color requirements: Use the lab's accepted format and color space. The linked Nations 3.5 × 5 product accepts JPG, TIFF and PNG and specifies sRGB; another provider may have different requirements.
5. Inspect the exported file: Check its actual pixel dimensions and crop, then inspect for compression artifacts or excessive sharpening. Do not rely only on a preset name or the PPI metadata.
6. Review the order preview: Confirm that the selected paper size, crop and border behavior still match your export.

If the lab accepts a larger file with the correct ratio, there is no need to shrink it solely to make the numbers equal the 300 PPI examples. Follow its limits. Keep separate presets for the two physical sizes so a later order does not reuse the wrong crop.

Deliver clearly labeled print files

Label each export by its intended use. For example, portrait-012_3x5in_900x1500.jpg and portrait-012_3.5x5in_1050x1500.jpg make the difference visible without opening the files. Keep any smaller social-sharing copies in a separately named set.

A short delivery note can say: “These files are cropped for a literal 3 × 5 inch print. Download the supplied file rather than taking a screenshot. Select the matching print size and check the lab's crop preview before ordering.” Adapt that note if the order is 3.5 × 5 or includes borders.

Finish cropping and export preparation in your photo editor. When the files are ready, the SendPhoto getting-started guide explains how to upload them to a gallery and share access. A gallery link makes the files available; the print specification and lab preview still determine how they should be printed.