Practical guide · dimensions explained
How many pixels do you need for a print?
Turn a provider’s PPI requirement into dimensions and understand rounding, crop losses and quality limits.
Reviewed September 28, 2026 · Worked examples calculated for this guide
Illustration of the related tool’s example; proportions only.
Use a target with context
Start with your provider’s guidance for the product and print process. The 300 PPI value used in our examples is editable; it is not a universal pass mark for every image or print. Physical size, viewing distance, source detail and printing method affect what is useful. A density calculator cannot evaluate focus, compression artifacts or color.
Multiply inches by PPI
An 8 × 10-inch canvas at a target of 300 PPI requires 2400 × 3000 pixels. That is 7.2 million pixels. At 200 PPI, the same physical dimensions require 1600 × 2000 pixels, or 3.2 million pixels. Doubling the target PPI doubles each side and quadruples the total pixel count; it does not merely double it.
Whole pixels need a rounding rule
Physical metric dimensions often produce fractional pixel counts. Nearest-pixel rounding is a useful approximate canvas size. If the target is a strict numerical minimum on each axis, round upward instead. For A4 at 300 PPI, these policies give 2480 × 3508 and 2481 × 3508 pixels respectively. Both slightly approximate the physical proportions because an image cannot have part of a pixel at its edge.
A larger source can still need a crop
The required canvas assumes that the image already matches the print ratio. A wide photo placed into a portrait print can lose much of its area. Use the image print checker to calculate the effective density after fit or fill. Treat bleed and safety margins as additional layout requirements supplied by the provider, rather than silently adding an arbitrary allowance.
Reference notes
References checked September 28, 2026. Calculations and worked examples are our own.