Image Size Calculation

Understanding image dimensions, DPI, and pixel calculations.

Published January 15, 2025 ET
designtechnical

Basic calculation

20,000,000 bytes, 8-bit color = 3 bytes per pixel = 6.66 million pixels

For a square image, that's about 2582px each side

12 inch screen => 215 DPI, very good

11-inch iPad Pro screen dimensions (4th gen)

  • Physical: 9.74" x 7.02"
  • 11" (279.4 mm) diagonal with a resolution of 2388 x 1668 px at 264 ppi