Image Print Size & DPI
Print size from pixels and DPI, the effective DPI of an image printed at a size (with a crop when ratios differ), or the pixels a print needs at a resolution.
Print width and height in cm or inches, effective DPI per axis, the crop to match a target ratio, the pixels required and the up- or downsampling factor against your image — no "required DPI" assumed.
Example: 6000 × 4000 px at 300 DPI prints 50.8 × 33.9 cm; printed 60 × 45 cm it is 254 × 226 DPI and needs a crop to 5333 × 4000. An 8 × 10 in print at 300 DPI needs 2400 × 3000 px.
Pixels, inches
and one equation.
How print size, resolution and pixels tie together, and why no "required DPI" is built in.
The relation
pixels = inches × DPI. Give pixels and DPI for the print size (÷ 2.54 for centimetres); give pixels and a print size for the effective DPI — per axis, since a print whose ratio differs from the image is a crop or a border; give a size and a DPI for the pixels needed, and the page compares them with your image to show the up- or downsampling factor.
Ratios and crops
When both print dimensions are given and their ratio differs from the image, the page reports the DPI on each axis and the crop that matches the target ratio at the smaller effective resolution — the honest number, since the printer cannot stretch one axis.
What DPI means here
Pixels per inch of the image on paper (often written PPI). A printer’s own dots per inch counts ink droplets and is a different, higher figure. How many pixels per inch a print needs depends on the printer, the paper and the viewing distance; that figure comes from the lab or the printer maker, so none is assumed. Nothing leaves the browser; the same four anonymous usage counts as the rest of the site apply.
SOURCES
- pixels = inches × DPI (1 in = 2.54 cm); effective DPI = pixels ÷ inches per axis; a crop to the target aspect keeps the smaller effective DPI — DPI means pixels per inch of the image
Last reviewed 21 September 2026. How results are checked: How we verify.