Calculations with Optical Instruments

Image Size Calculation for Scale and Crop

A calculator for resizing (scaling and cropping) images and keeping the ratio. Enter width and height of the original image and one other value. Width and heigh can have any unit, like pixels (px), point, pica or millimeters, the result has the same unit. The percent values are always rounded to two decimal places.

WidthHeightPercent %
Original size x  
New Size x  
Remove (−)
Add (+)

Round to decimal places

Example: an image with 6000x4000 pixels, scaled to 40%, shrinks to 2400x1600 pixels. 3600 pixels in width and 2400 pixels in height are gone.

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