Image tools
Photo size in pixels calculator
Turn any photo or print size into pixels at 300 DPI or any other resolution, or turn pixels back into a print size. The common passport and print sizes are listed below.
- mm, cm, inches ↔ pixels
- Any DPI
Tap a size for every DPI and the photos that use it.
| Size | 300 DPI | 600 DPI | Also written |
|---|---|---|---|
| 35 × 45 mm | 413 × 531 px | 827 × 1063 px | 3.50 × 4.50 cm, or 1.38 × 1.77 in |
| 2 × 2 inches | 600 × 600 px | 1200 × 1200 px | 50.8 × 50.8 mm, or 5.08 × 5.08 cm |
| 33 × 48 mm | 390 × 567 px | 780 × 1134 px | 3.30 × 4.80 cm, or 1.30 × 1.89 in |
| 4 × 6 inches | 1200 × 1800 px | 2400 × 3600 px | 101.6 × 152.4 mm, or 10.16 × 15.24 cm |
| 5 × 7 inches | 1500 × 2100 px | 3000 × 4200 px | 127.0 × 177.8 mm, or 12.70 × 17.78 cm |
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How to convert a photo size to pixels
- 01
Enter the width and height
In mm, cm or inches, or in pixels to get a print size.
- 02
Pick the DPI
300 for prints, 600 if a printer asks for it.
- 03
Read the answer
Pixels, millimetres and inches update as you type.
The formula
- Pixels = size in inches × DPI. One inch is 25.4 mm, so divide millimetres by 25.4 first.
- Example: 35 mm at 300 DPI is 35 ÷ 25.4 × 300 ≈ 413 pixels.
- Going back: print size in inches = pixels ÷ DPI.
Questions people ask
How do I convert mm to pixels?
Divide the millimetres by 25.4 to get inches, then multiply by the DPI. At 300 DPI, 35 × 45 mm becomes 413 × 531 px.
How many pixels is a passport photo?
It depends on the country's size. At 300 DPI, a 35 × 45 mm photo (UK, Schengen, India, Australia) is 413 × 531 px and a 2 × 2 in photo (US) is 600 × 600 px. Online forms often state their own pixel size; use that when they do.
How do I convert pixels to inches?
Divide the pixels by the DPI. 1800 pixels at 300 DPI print at 6 inches.
What does DPI mean?
Dots per inch: how many pixels a printer puts in each inch. It sets the print size of an image, not its quality. Screens ignore it.