How this tool works
New dimensions = original dimensions x scale percentage. Pixels = width x height.
Image Resize Calculator
Scale image dimensions by percentage and estimate total pixels.
Formula
New width and height are calculated from the resize percentage. Total pixels are width multiplied by height.
Example
A 4000 x 3000 image resized to 50% becomes 2000 x 1500, which is one quarter of the original pixel count.
Common mistake
Reducing width by half also reduces height by half, so total pixels fall much more than many people expect.