Print DPI Calculator
Understanding print resolution helps you decide whether an image has enough pixels for a given print size, or what the maximum print size is at a specific quality target. DPI (dots per inch), or more precisely PPI (pixels per inch), is simply the number of pixels divided by the print dimension in inches. Enter your image pixel dimensions and the print size you want, and this calculator will show you the resulting DPI along with the maximum recommended print size at 300 DPI and 240 DPI quality thresholds.
Print DPI formula
DPI = pixel dimension / print dimension (inches)
Max print size (in) = pixel dimension / target DPI
Example: 6,000 x 4,000 px image printed at 20 x 13 inches. DPI (width) = 6,000 / 20 = 300 DPI. DPI (height) = 4,000 / 13 = 307 DPI. Max print at 300 DPI: width = 6,000 / 300 = 20 in, height = 4,000 / 300 = 13.3 in.
DPI quality guide
- 300 DPI: professional photo print quality, viewed at 25-30 cm (10-12 inches)
- 240 DPI: acceptable for most photo labs, slight loss only visible under magnification
- 150 DPI: visible quality loss at normal viewing distance, suitable for display prints viewed from 50+ cm
- 100 DPI: large format output (banners, posters viewed from 1+ meters)
- 72 DPI: screen display only; not suitable for physical printing
Print DPI calculator: frequently asked questions
What is DPI in printing?
DPI stands for dots per inch. In photography, it refers to PPI (pixels per inch), which describes how many pixels from your image file correspond to each inch of the printed output. A higher PPI means more detail per inch. The terms DPI and PPI are often used interchangeably for digital prints.
What DPI is good for photo printing?
300 PPI is the standard for professional quality photo prints viewed at normal distance. 240 PPI is acceptable for many print labs. 150 PPI is visible at arm's length. Large format prints viewed from farther away (billboards, banners) can use 72-150 PPI without visible quality loss.
How many pixels do I need for an 8x10 print at 300 DPI?
Pixels needed = print dimension (in) x DPI. For 8x10 at 300 DPI: 8 x 300 = 2,400 pixels wide, 10 x 300 = 3,000 pixels tall. Total: 2,400 x 3,000 = 7.2 megapixels. Most modern cameras (18+ MP) exceed this comfortably.
What is the maximum print size for a 24-megapixel image at 300 DPI?
A typical 24 MP camera produces 6,000 x 4,000 pixels. At 300 DPI: max print width = 6,000 / 300 = 20 inches, height = 4,000 / 300 = 13.3 inches. A 20x13-inch print at 300 DPI.
Why do screens use 72 DPI but prints need 300 DPI?
Computer screens display 72-227 pixels per inch (PPI) depending on the screen. Printers place ink dots much closer together, so 300 dots per inch printed on paper matches the detail a print lab achieves. Setting a file to 72 DPI does not reduce pixel count; it only changes the metadata embedded in the file about intended output size.
Official sources
- ISO 12640-1: Graphic technology, Prepress digital data exchange (defines PPI in print context). ISO.org.
- NIST: Units and conversions reference. NIST.gov.
Reviewed by the CalculatorHub team, edited by James Graham, 15 June 2026. See our methodology.