Work out the printed size of an image from its pixel dimensions and DPI.
print width in inches = pixel width / DPI, print height in inches = pixel height / DPI, and centimeters = inches × 2.54. For example, a 3000×2400px image at 300 DPI prints at 10 × 8 inches, or 25.4 × 20.32 cm.
Print width in inches equals pixel width divided by DPI, and likewise for height. Centimeters are inches multiplied by 2.54.
Use 300 DPI for most professional print jobs, or check your printer's or print service's recommended DPI if you have one.