Pixels to Inches Converter
Turn pixels into inches, centimetres or millimetres — and back — at any PPI, with the paper sizes people ask about most worked out in pixels.
Updated October 2026 · Free · Works entirely in your browser
The formula
inches = pixels ÷ PPI, and pixels = inches × PPI. For centimetres multiply the inches by 2.54; for millimetres by 25.4. Those two factors are exact — the inch has been defined as 25.4 mm since 1959 — so the only number you ever have to choose is the PPI.
That choice is the whole story. A pixel is a sample, not a measurement, so “how many inches is 1920 pixels?” has no single answer: it is 6.4 inches printed at 300 PPI, 20 inches on a web page at 96 CSS pixels per inch, and 26.7 inches if a program assumes 72.
Which PPI to use
| PPI | Where it comes from | Use it for |
|---|---|---|
| 96 | The CSS reference pixel (1 px = 1/96 in) | Web layouts, Word and Google Docs page sizes, Windows at 100% scaling |
| 72 | Original Macintosh screens and PostScript points (1 pt = 1/72 in) | PDF page sizes and the default many cameras and editors write into files |
| 150 | Half of print resolution | Posters, banners and anything viewed from a metre or more |
| 300 | Roughly what the eye resolves at reading distance | Photo prints, flyers, books, business cards |
| 600 | Office laser printers and scanners | Line art, signatures and documents you will scan back in |
Paper sizes in pixels
Rounded to the nearest whole pixel. ISO sizes such as A4 are defined in millimetres, so they never land on a round number of pixels.
| Paper | 72 PPI | 96 PPI | 150 PPI | 300 PPI |
|---|---|---|---|---|
| US Letter (8.5 × 11 in) | 612 × 792 | 816 × 1056 | 1275 × 1650 | 2550 × 3300 |
| US Legal (8.5 × 14 in) | 612 × 1008 | 816 × 1344 | 1275 × 2100 | 2550 × 4200 |
| Tabloid (11 × 17 in) | 792 × 1224 | 1056 × 1632 | 1650 × 2550 | 3300 × 5100 |
| A4 (210 × 297 mm) | 595 × 842 | 794 × 1123 | 1240 × 1754 | 2480 × 3508 |
| A5 (148 × 210 mm) | 420 × 595 | 559 × 794 | 874 × 1240 | 1748 × 2480 |
| A3 (297 × 420 mm) | 842 × 1191 | 1123 × 1587 | 1754 × 2480 | 3508 × 4961 |
| 4 × 6 in photo | 288 × 432 | 384 × 576 | 600 × 900 | 1200 × 1800 |
| 5 × 7 in photo | 360 × 504 | 480 × 672 | 750 × 1050 | 1500 × 2100 |
| 8 × 10 in photo | 576 × 720 | 768 × 960 | 1200 × 1500 | 2400 × 3000 |
Common pixel widths in inches
| Pixels | at 72 PPI | at 96 PPI | at 300 PPI |
|---|---|---|---|
| 100 px | 1.39 in | 1.04 in | 0.33 in |
| 500 px | 6.94 in | 5.21 in | 1.67 in |
| 1,000 px | 13.89 in | 10.42 in | 3.33 in |
| 1,080 px | 15 in | 11.25 in | 3.6 in |
| 1,200 px | 16.67 in | 12.5 in | 4 in |
| 1,920 px | 26.67 in | 20 in | 6.4 in |
| 3,000 px | 41.67 in | 31.25 in | 10 in |
| 4,000 px | 55.56 in | 41.67 in | 13.33 in |
When the number in the file does not match
Every JPG and PNG can carry a PPI tag, and a print shop or Word will use it to decide how big to make the picture. It changes nothing about the pixels. If your 3000-pixel image opens at 41.7 inches wide, the file says 72 PPI; set the tag to 300 with the Change Image DPI tool and the same pixels lay out at 10 inches, with no resampling and no quality change. To check what a file says now, use the Image DPI Checker.
Going the other direction — you need a 5 × 7 in print at 300 PPI and the image is only 1000 pixels wide — there is no tag that helps. You need 1500 × 2100 pixels of real detail. The DPI & Print Size Calculator shows how big the pixels you have will print before they go soft.
Gear we recommend for this workflow
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Epson Premium Photo Paper Glossy 8.5x11 50 sheets S041667
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Frequently Asked Questions
Everything you need to know about image conversion.