Image File Size Calculator
Works out how much memory or disk an image takes.
Uncompressed size
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Share sends a link that reopens these numbers. Copy details pastes the full breakdown as a list.
In binary units (powers of 1,024) —
Compressed estimate —
Megapixels — MP
The formula
bytes = width × height × bits per pixel ÷ 8
The uncompressed figure is exact, apart from a small header. The compressed one is only as good as the ratio you give it.
What to watch out for
Photos compress far more than sharp graphics in JPEG, and the reverse is true in PNG.
Frequently Asked Questions
How big is a 24-megapixel image uncompressed?
72.00 MB at 24 bits per pixel.