Image Scaling Calculator
Shows what a percentage scale does to an image’s size.
New size
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Share sends a link that reopens these numbers. Copy details pastes the full breakdown as a list.
Megapixels before — MP
Megapixels after — MP
Share of the original pixels — %
Reading this —
The formula
new side = side × scale pixels = original pixels × scale²
At 50% scale you keep a quarter of the pixels.
What to watch out for
File size follows the pixel count only roughly, because compression changes with the content.
Frequently Asked Questions
What does 50% do to a 4000 × 3000 image?
It becomes 2000 × 1500, with 25% of the pixels.