CrispKit

4x6 photo size in pixels

A 4x6 photo print is 4 × 6 in: exactly 10.16 × 15.24 cm, or 101.6 × 152.4 mm (worked out: inches × 2.54; the lab rounds it to 10.2 × 15.2 cm). At 300 DPI that is 1200 × 1800 pixels (2.16 MP); at 150 DPI it is 600 × 900 pixels. At 72, 96 and 600 DPI: 288 × 432, 384 × 576 and 2400 × 3600. Its shape is 2:3.

Nations Photo Lab, Print Size Guide lists it in its “Photo Print Size Chart” as 4x6" (10.2 x 15.2 cm) and WHCC Help, Crop Ratios lists 4x6 under “Common Print Sizes” in its 2:3 group.

Nations Photo Lab, Print Size Guide: “Standard photo albums often feature slots for 4x6" or 5x7" Prints.”

Crop a photo to 4x6 at 300 DPI

Choose a photo, pick portrait or landscape, then drag and zoom. The download is exactly 1200 × 1800 px (or 1800 × 1200 for landscape), with 300 DPI written into the file, so apps that read that mark show it as 4 × 6 in.

1Choose an image, then drag and zoom

or drop an image here, or paste one with Ctrl/Cmd+V

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24x6 print

How to fit the image

3Your image

1200 × 1800 JPG

4x6 print specs

Rows marked “worked out” are arithmetic on the size the lab lists. The rest link to the page they came from.

4x6 print specs
SpecValueSource
Print size4 × 6 inSource: Nations Photo Lab, Print Size Guide, read on the source page
Print size4 × 6 inSource: WHCC Help, Crop Ratios, read on the source page
Size in cm10.2 × 15.2 cmSource: Nations Photo Lab, Print Size Guide, read on the source page
Exact size in cm10.16 × 15.24 cmWorked out from inches × 2.54
Size in mm101.6 × 152.4 mmWorked out from inches × 25.4
Aspect ratio2:3Worked out from 4 : 6, reduced
Ratio group (WHCC)2:3Source: WHCC Help, Crop Ratios, read on the source page
Pixels at 300 DPI1200 × 1800 pxWorked out from inches × 300
Pixels at 150 DPI600 × 900 pxWorked out from inches × 150
Megapixels at 300 DPI2.16 MPWorked out from 1200 × 1800 / 1,000,000
Kept from a 2:3 photo100%Worked out from the 2:3 frame cropped to 2:3, by area
Kept from a 4:3 photo88.9%Worked out from a 4:3 frame cropped to 2:3, by area
Measured PNG output719 KBsample-avatar.jpg (1600 × 1200) cropped to 1200 × 1800 by this tool in Chromium 156,
Measured JPG output112 KBsample-avatar.jpg (1600 × 1200) cropped to 1200 × 1800 by this tool in Chromium 156,

4x6 in pixels at other DPIs

Pixels are inches × DPI, so the same 4x6 needs a different pixel count at each DPI. If an app, a form or a print shop asks for one of these, use that row. On screens, web pages measure in CSS pixels: W3C, CSS Values and Units Module Level 4 defines “1in = 2.54cm = 96px”. So a 4x6 area laid out in CSS inches is 384 × 576 CSS pixels.

4x6 in pixels by DPI
SpecValueSource
Pixels at 72 DPI288 × 432 pxWorked out from inches × 72
Pixels at 96 DPI384 × 576 pxWorked out from inches × 96
Pixels at 150 DPI600 × 900 pxWorked out from inches × 150
Pixels at 300 DPI1200 × 1800 pxWorked out from inches × 300
Pixels at 600 DPI2400 × 3600 pxWorked out from inches × 600

Will a camera photo fit 4x6?

WHCC Help, Crop Ratios says: “Most commonly, cameras default to a 2:3 ratio.” A 4x6 print has that same 2:3 shape, so a 2:3 photo fills it with no crop: 100% of the frame is kept.

Not every photo is 2:3. Our example photo is 1600 × 1200 px, a 4:3 shape. Cropped to 4x6, a 4:3 photo keeps 88.9% of the frame (worked out the same way, by area). To check the shape of your own photo, use the Aspect Ratio Finder.

Same 2:3 shape, other sizes

A photo cropped for 4x6 prints at 8x12, 12x18, 20x30 and 24x36 without a new crop: only the pixel count changes.

What this tool made at 1200 × 1800

We ran this tool on our example photo (sample-avatar.jpg, 1600 × 1200 px). Cropped to 1200 × 1800, it saved as a 112 KB JPG and a 719 KB PNG (Chromium 156, ). Our example was too small for 1200 × 1800, so the tool scaled it up: that adds pixels but no detail. For a sharp print, start from a photo at least this big.

Other print sizes in pixels

Questions

How many pixels is a 4x6 at 300 DPI?

1200 × 1800 pixels: 4 × 6 in × 300. At 150 DPI it is 600 × 900. WHCC Help, Image Resolution says “the original file needs to be as close to the desired print size as possible when it’s at 300ppi”.

What is 4x6 in cm and mm?

Exactly 10.16 × 15.24 cm, or 101.6 × 152.4 mm, worked out from inches. The lab lists it as 10.2 × 15.2 cm.

Will a 2:3 camera photo fit 4x6?

Yes, with no crop: 4x6 is 2:3.

This page shows 4x6 as the linked photo labs list it, and pixel counts worked out from that size. Labs trim and round sizes in their own way, so check your lab’s size list before you order.

Nations Photo Lab, WHCC and the W3C are named only as sources for facts on this page. CrispKit is not affiliated with any of them.

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