What this calculator does
Use pixel-to-print mode when you already have an image. Switch to print-to-pixels mode when you know the physical size you want and need to prepare a file at a chosen DPI.
Print size formulas
Print inches = pixels ÷ DPIRequired pixels = print inches × DPICentimeters = inches × 2.54Worked examples
3600 × 2400 at 300 DPI
The exact mathematical print size is 12 × 8 inches, or 30.48 × 20.32 centimeters.
An 8.5 × 11 inch page at 300 DPI
Prepare at least 2550 × 3300 pixels before accounting for any bleed required by the printer.
Frequently asked questions
Is DPI the same as PPI?
They describe different stages: PPI is pixel density in a digital image or display, while DPI refers to printer dots. They are often used interchangeably in simple print calculations.
Should I always use 300 DPI?
No. 300 DPI is a useful high-detail target, not a universal requirement. Larger prints viewed from a distance can work at a lower effective density.
Does this calculator include print bleed?
No. Bleed requirements vary by printer. Add the printer’s specified bleed to the final physical dimensions before calculating required pixels.
Why does the calculator round required pixels up?
A fractional pixel cannot exist. Rounding up ensures the file meets or slightly exceeds the requested density.