4×6 Photo Print Aspect Ratio Calculator
4×6 inches (10×15 cm) is the most common photo print size and is exactly 3:2 — the same ratio as 35mm film and full-frame sensors, which is why camera photos print 4×6 without cropping.
Ratio locked to 4×6 Photo Print. Enter either side, get the other.
Enter a width or height above.
Common 4×6 Photo Print sizes
| Pixels | Usage |
|---|---|
| 600×900 | 150 DPI — acceptable |
| 1200×1800 | 300 DPI — print quality |
| 1800×2700 | 450 DPI — fine art |
| 400×600 | 100 DPI — avoid |
Frequently asked questions
How many pixels is a 4×6 print at 300 DPI?
1200×1800 pixels. At 150 DPI, 600×900 is acceptable for casual prints, but 300 DPI (1200×1800) is the photo-lab standard for sharpness.
Why does my phone photo get cropped when printing 4×6?
Phone cameras default to 4:3, which is taller than 3:2. Printing labs crop the top or bottom to fit — check the crop preview or use our calculator to plan the framing.
Is 4×6 the same as 10×15 cm?
Yes — 4×6 inches equals 10.2×15.2 cm. The metric size sold in Europe and Asia (10×15) is marginally smaller but treated as the same print format.