Calculate megapixel

Convert image dimensions to megapixels, print size at DPI, and an uncompressed storage estimate.

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ToolMegapixel Calculator
Input
Output
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Preview

How it works

Total pixels equal width × height, megapixels divide by 1,000,000, and DPI converts pixels to printed inches. Estimated bytes multiply total pixels by bits per pixel ÷ 8.

  • 300 DPI and two bytes per pixel are editable estimates.
  • The estimate is raw raster storage, not compressed file size.

Worked example

A 24 megapixel camera
6000x4000 pixels, printed at 300 DPI
Input
											Width px: 6000
Height px: 4000
Output
												Megapixels: 24
Print width inches: 20
Print height inches: 13.33
Estimated file size mb: 5.72

When to use this

Print workflows check dimensions, camera comparisons use megapixels, and storage planning estimates raw raster memory.

Edge cases

  • A 24 MP image can have widely different JPEG sizes.
  • DPI metadata does not create pixels or optical detail.
  • Bits per pixel must match channel-depth and alpha assumptions.