How big is a 4×6 photo?

4×6 photo dimensions in inches, CM and MM

In a photo-print order, 4×6 normally describes the paper in inches. Portrait and landscape use the same paper; only the width and height swap.

The metric conversion is exact: one inch equals 25.4 mm. Multiply each inch dimension by 2.54 for centimeters. A “10×15 cm” lab label can be an approximate equivalent; check the product’s actual dimensions for a precise frame or mount.

To judge the physical size, mark a 10.16 × 15.24 cm rectangle on a sheet with a ruler. An on-screen image labeled “actual size” is unreliable unless the display has been calibrated; browser zoom and screen density change what you see.

What size is a 4×6 photo in pixels?

Multiply each side in inches by the required pixels per inch. At 300 PPI, that is 4 × 300 = 1200 and 6 × 300 = 1800. A landscape file reverses those dimensions.

Start with 1200 × 1800 pixels or more for a detailed 4×6 print, provided the original is sharp. That is 2.16 megapixels after cropping. It is a useful target, not a guarantee: focus, compression, paper and the printer also affect the result. Follow the lab’s requirements if they specify something different.

You do not need to reduce a larger original to exactly 1200 × 1800 unless the upload workflow asks for it. Nor does changing a small image’s tag to “300 DPI” add pixels. For example, 600 × 900 pixels spread over 4 × 6 inches gives only 150 PPI, whatever its metadata says. Adobe explains the distinction between pixel dimensions, resolution and resampling.

Why a phone photo can get cropped at 4×6

A 4×6 print is a 3:2 rectangle in landscape. An image shot at 4:3 is relatively taller. You cannot fill the 3:2 paper, keep the whole 4:3 image and preserve its proportions all at once. Choose which matters more: a filled sheet or the complete composition.

Original illustrations of the same 4:3 scene on 3:2 paper. They show aspect-ratio behavior, not a printer’s additional edge expansion.

Do not stretch the image to force the fit. Unlocking width and height changes the shape of faces and objects. Choose a 3:2 crop, or use the printing app’s whole-image/fit option. The names of those options vary by app.

A matching ratio does not guarantee that every edge survives borderless printing. Some printers expand the image slightly beyond the paper. Inspect the preview and keep important details away from the very edge.

Prepare a 4×6 photo without distortion

1. Use the original image.Start from the camera file rather than a screenshot or a repeatedly saved copy. Check width and height in the Image Metadata Viewer. The file extension or size in MB does not tell you its print dimensions.
2. Choose crop or fit before resizing.For edge-to-edge portrait output, crop to 2:3; for landscape, use 3:2. Use a crop-capable editor for this. If preserving the whole photo is more important, let the print app fit it with borders instead.
3. Resize only when needed.For a prepared 3:2 landscape image, open the Image Resizer, keep Lock aspect ratio on, and enter 1800 px for width. Height should be 1200 px. Portrait is 1200 px wide and 1800 px high. This tool does not crop or add borders.
4. Set DPI after resizing, if the lab asks.For JPG or PNG, use the DPI Converter to set a 300-DPI tag. If your source is WebP and the lab requires JPG, convert the image before setting that final tag.
5. Check the actual print order.Select 4×6-inch paper, orientation and the intended crop/fit setting. Check the preview, including borderless expansion. Print one test before ordering a large batch.

For a fit-with-borders order, you can keep the full image at its original ratio and let the lab place it on the paper. Do not follow the 1800 × 1200 resize example unless you have already cropped to that ratio or added borders in an editor. SuperUtils’ “Do not enlarge beyond the original” setting also prevents a small source from reaching a larger requested size by default.

Is 4×6 the same as A6, 5×7 or 4R?

A6 is close, but not identical. A6 is 3.4 mm wider and 4.4 mm shorter than a portrait 4×6-inch print. A 5×7 print is larger in both directions, with a different ratio. A frame, sleeve or crop made for one is not automatically suitable for another.

Some labs call a 4×6-inch print 4R. Check the lab’s dimensions rather than relying on the label alone. If you are designing a folded page rather than ordering a photo, the A5 guide covers page setup and bleed.

When the print does not look right

A head or edge is cut off

Check the source ratio, move the crop, or switch to fit with borders. Check borderless expansion separately; it can crop even a correctly shaped file.

The image looks stretched

Return to the original, enable aspect-ratio locking, and crop or fit instead of changing width and height independently.

The print looks blurry

Check the pixels remaining after cropping and inspect the original at 100%. A sharper source helps; a new DPI tag cannot undo blur or recover discarded detail.

The printed size is wrong

Check inches versus centimeters, the selected paper size, and print scaling. For a precise mount, measure a test print; do not trust how large it looks on your screen.

Frequently asked questions

Calculation note: pixels = inches × PPI; centimeters = inches × 2.54. The crop/border example assumes centered placement and no additional printer expansion. Inch equivalents for A-series paper are rounded.