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I came here googling the same problem. It seems the pixel counter tool breaks down at higher numbers. It says 100000 for a blank 100x100 image, 200000 for a 200x1000 image, 300000 for 300x1000, but 100000 for a 400x100000 image. :frown: And for images with millions of pixels in them it never seems to show more than six digits.

But there is a workaround. If the area being selected has the same width and height as the canvas, then the ratio should be correct. So here's what you do.

1. Select the area you want to measure.
2. Go to Window -> Histogram. Take a note of the number of pixels it says in the bottom-left of this panel*.
3. Go to Image -> Crop, to crop the image around your selection. Then deselect it (Select -> Deselect). Again, take a note of the pixel count in the histogram panel.**
4. Divide the first number by the second to get a number between 0 and 1.
5. Now go to Image -> Image Size, and measure the actual number of pixels in the rectangle you just cropped by multiplying the width and the height together.
6. Multiply this with the number from the previous step. And you'll have the number of pixels in your selection.
7. to convert this to square centimetres or square inches, divide by the resolution twice. Remember the original area is effectively measured in 'square pixels' if we consider pixels to be a unit of length.

*If you can't see it, click HERE: [ATTACH]19969[/ATTACH] and click extended view.