Print · size
Turn pixels into a real print size, or use paper size and DPI to calculate the minimum pixels required.
No image upload
- Convert
- mm · DPI → px
- Presets
- A3 · A4 · A5 · photos
- Formula
- mm ÷ 25.4 × DPI
Calculation notes
Set the trim size first. Then ask whether the pixels are enough.
Pixels describe the samples in a file; millimeters and inches describe the final physical size. DPI connects them. The core formula is pixels ÷ DPI = inches, then multiply by 25.4 for millimeters.
Bleed, crop marks, binding margins, and special print processes are outside this calculator. Recheck the printer's template before delivery.
Open Print Size Lab for bleed and effective image DPIFAQ
DPI and real sharpness
Does higher DPI always mean sharper print?
At the same physical size, higher DPI requires more pixels and can preserve more detail. It cannot create detail missing from a blurred source image.
How many pixels does A4 need at 300 DPI?
At 210 × 297 mm, portrait A4 is about 2480 × 3508 px. Software rounding can differ by one pixel.
Do web images need 300 DPI?
Usually not. Screen display mainly depends on pixel dimensions and device density. 300 DPI is primarily a print-output specification.