Oh yeah? Well I use XnView, and it can too!
Actually, I originally made PixCalc to be just a calculator, so I could take the pixel sizes and figure out the print sizes (hence pixels to inches) - that's why it's called Pix - Calc.
Then I realized how easy it would be to drag-n-drop an image and load the values automatically.
PixCalc is just a calculator for lazy people like m who don't want to do math to figure inches...