Pixels to Inches Converter: PPI & DPI Calculator

Pixels have no fixed size: how many inches they cover depends on the resolution, in pixels per inch (PPI). Convert pixels to inches or centimeters, inches to pixels, or find the PPI of a print.

How to convert pixels to inches

Inches = pixels ÷ PPI. 1,800 pixels at 300 PPI is 1,800 ÷ 300 = 6 inches.
Pixels = inches × PPI. An 8-inch side at 300 PPI needs 8 × 300 = 2,400 pixels.
PPI = pixels ÷ inches. 3,000 pixels across 10 inches is 300 PPI.
Centimeters = inches × 2.54. An inch is exactly 2.54 cm, so pixels to cm is pixels ÷ PPI × 2.54.

Pixels to inches chart

Inches at four common resolutions: 72 PPI (one pixel per typographic point), 96 PPI (the CSS pixel used for web layouts), 150 PPI and 300 PPI, the resolution Shutterfly recommends for photo prints.

Pixels	72 PPI	96 PPI	150 PPI	300 PPI
100 px	1.39 in	1.04 in	0.67 in	0.33 in
200 px	2.78 in	2.08 in	1.33 in	0.67 in
300 px	4.17 in	3.13 in	2 in	1 in
400 px	5.56 in	4.17 in	2.67 in	1.33 in
500 px	6.94 in	5.21 in	3.33 in	1.67 in
600 px	8.33 in	6.25 in	4 in	2 in
720 px	10 in	7.5 in	4.8 in	2.4 in
800 px	11.11 in	8.33 in	5.33 in	2.67 in
1,000 px	13.89 in	10.42 in	6.67 in	3.33 in
1,080 px	15 in	11.25 in	7.2 in	3.6 in
1,200 px	16.67 in	12.5 in	8 in	4 in
1,500 px	20.83 in	15.63 in	10 in	5 in
1,800 px	25 in	18.75 in	12 in	6 in
1,920 px	26.67 in	20 in	12.8 in	6.4 in
2,000 px	27.78 in	20.83 in	13.33 in	6.67 in
2,400 px	33.33 in	25 in	16 in	8 in
3,000 px	41.67 in	31.25 in	20 in	10 in
3,840 px	53.33 in	40 in	25.6 in	12.8 in
4,000 px	55.56 in	41.67 in	26.67 in	13.33 in
6,000 px	83.33 in	62.5 in	40 in	20 in

Inches to pixels chart

Inches	cm	72 PPI	96 PPI	150 PPI	300 PPI
1 in	2.54	72 px	96 px	150 px	300 px
2 in	5.08	144 px	192 px	300 px	600 px
3 in	7.62	216 px	288 px	450 px	900 px
4 in	10.16	288 px	384 px	600 px	1,200 px
5 in	12.7	360 px	480 px	750 px	1,500 px
6 in	15.24	432 px	576 px	900 px	1,800 px
7 in	17.78	504 px	672 px	1,050 px	2,100 px
8 in	20.32	576 px	768 px	1,200 px	2,400 px
10 in	25.4	720 px	960 px	1,500 px	3,000 px
12 in	30.48	864 px	1,152 px	1,800 px	3,600 px
16 in	40.64	1,152 px	1,536 px	2,400 px	4,800 px
20 in	50.8	1,440 px	1,920 px	3,000 px	6,000 px
24 in	60.96	1,728 px	2,304 px	3,600 px	7,200 px
36 in	91.44	2,592 px	3,456 px	5,400 px	10,800 px

How many pixels are in an inch?

It depends on what you're measuring:

On a web page, 96. The CSS standard defines 1px as 1/96 inch and 1pt as 1/72 inch, so a 960px-wide image is laid out 10 "CSS inches" wide. Held up to a ruler on a real screen it rarely measures exactly 10 inches, because screens differ in pixel density.
On a screen, its pixel density. The iPhone 17's screen is 460 ppi. Dell's UltraSharp U3425WE has a 0.2325 mm pixel pitch, which is 25.4 ÷ 0.2325 = 109 pixels per inch.
On a print, whatever PPI you print at. Shutterfly recommends 300 PPI, Mpix calls 250 optimal and 100 its minimum, and Nations Photo Lab says 125 or more prints well.

PPI vs DPI: what's the difference?

PPI (pixels per inch) is how many image pixels fit in an inch of the print or screen. DPI (dots per inch) is how many ink dots a printer can place in an inch. They are different things: Canon's PIXMA PRO-200S prints at up to 4,800 × 2,400 dpi, using many tiny dots of ink to reproduce each image pixel, while photo labs ask for 100 to 300 pixels per inch in the photo itself.

The two terms are often swapped. When a print lab, a photo editor's "resolution" box or a form asks for a 300 DPI image, it means 300 pixels per inch at the printed size, which is what this converter calculates. Changing that number without resampling doesn't add detail; it only changes the size the image prints at. Shopping for a printer? See our photo printer picks.

Pixels for common photo print sizes

Print (in)	300 PPI	150 PPI
Wallet (2.5 × 3.5)	750 × 1,050	375 × 525
4 × 6	1,200 × 1,800	600 × 900
5 × 7	1,500 × 2,100	750 × 1,050
8 × 10	2,400 × 3,000	1,200 × 1,500
11 × 14	3,300 × 4,200	1,650 × 2,100
16 × 20	4,800 × 6,000	2,400 × 3,000
20 × 30	6,000 × 9,000	3,000 × 4,500

Every standard size, with lab recommendations and frame sizes, is on the photo size chart.

Megapixels to print size

A megapixel is a million pixels. For a 3:2 photo, the largest print with no cropping:

Megapixels	Pixels (3:2)	At 300 PPI	At 150 PPI
12 MP	4,243 × 2,828	14.1 × 9.43 in	28.3 × 18.9 in
16 MP	4,899 × 3,266	16.3 × 10.9 in	32.7 × 21.8 in
20 MP	5,477 × 3,651	18.3 × 12.2 in	36.5 × 24.3 in
24 MP	6,000 × 4,000	20.0 × 13.3 in	40.0 × 26.7 in
33 MP	7,036 × 4,690	23.5 × 15.6 in	46.9 × 31.3 in
40 MP	7,746 × 5,164	25.8 × 17.2 in	51.6 × 34.4 in
45 MP	8,216 × 5,477	27.4 × 18.3 in	54.8 × 36.5 in
61 MP	9,566 × 6,377	31.9 × 21.3 in	63.8 × 42.5 in

Doubling megapixels makes each side only about 1.4 times longer, since print size grows with the square root of the pixel count. For a photo that isn't 3:2, or to see which standard sizes crop it, use the print size calculator or the aspect ratio calculator.

How this converter works

All conversions are arithmetic: inches = pixels ÷ PPI, 1 inch = 2.54 cm exactly, and CSS uses 96 pixels per inch. Pixel results are rounded to whole pixels, inches to two decimal places. The print quality note compares your PPI with the labs' published figures.

Sources

W3C, CSS Values and Units Module Level 4, absolute lengths www.w3.org/TR/css-values-4/#absolute-lengths
Apple, iPhone 17 Technical Specifications www.apple.com/iphone-17/specs/
Dell, UltraSharp 34 Curved Thunderbolt Hub Monitor U3425WE (tech specs) www.dell.com/en-us/shop/monitors/apd/dell-ultrasharp-34-curved-thunderbolt-hub-monitor-u3425we/u3425we_monitor/-
Canon U.S.A., PIXMA PRO-200S specifications www.usa.canon.com/shop/p/pixma-pro-200s
Shutterfly, Everything you need to know about Shutterfly photo prints (sizes and recommended resolution) www.shutterfly.com/ideas/everything-you-need-to-know-about-shutterfly-photo-prints/
Mpix, Requirements to upload your photos (optimal and minimum pixels by size) www.mpix.com/help/uploading-photos
Nations Photo Lab, Best Resolutions for Printing Pictures www.nationsphotolab.com/guide/image-resolution

Sources checked 2026-10-19.