P: Display Photo Dimension live while cropping.

The comments about pixels not mattering until export miss the mark and don't address OP's request.

An example use case of this feature would be a deliverable that is going to print at a certain size and minumum resolution requirement. If you crop too much you will fall below the number of pixels required to meet that deliverable. Sure, you can over-crop the image and then set your export to force the correct deliverable (5x7" @300 dpi, for example), but if the cropped image in the Develop module is not 7 x 300 = 2,100 pixels wide you're either losing quality (upscaling) or it will be too small.

OP is simply asking to be aware of this in real time as they are setting the crop dimension in the Develop module. As others have stated, LR knows these values, it just does not currently display them until after the crop is applied (Loupe Info Overlay).

@gfsjyg

LrC like Photoshop or Capture One should display the crop live in the Ui.

Even Dropbox shows the exact pixels when cropping on my mobile phone.

LrC is simply embarrassing when it comes to Cropping. Worse pro app on the market for this task.

I suggest you to use/download Any Crop by @johnrellis 

Dowload Any Crop 

You can crop while zooming AND it allows to even crop one pixel at the time + can dispaly crop pixles live.

If form time to time you need to have exact pixels (e.g.1000 x 1980) you can: create a preset > apply it > delete preset after.

That's the workaround to use in Any Crop to set a custom crop fast and precisely.

.

LR DOES record and display the cropped size of the image.  After doing a crop in Develop go back to Library and look at the "Cropped" information in the EXIF section.  When you export, the resulting image will be derived from those cropped pixels and nothing else.  If you don't do resizing on export the resulting image WILL have exactly those pixel dimensions.  

A scenario that demands different crops is printing canvas wraps.  At a small size the proportion of the image that is wrapped, say 1.5", is larger than at larger sizes.  If you print an image where the borders are sized for a small frame, then print the same image at a much larger size, part of the portion that was intended to be only on the wrapped edge will instead appear on the main face.  If you've done reflected borders (or solid ones) it looks horrible.  I can easily compute the reduced "total" image size, in pixels, that ensures the correct wrap position for any final print size, and it would be SO convenient to just make a virtual copy and apply that crop! 

I have discovered that if you turn on display of "Loupe Info" and choose "Info 1" the resulting croip size will display in the Develop module once you commit the crop.  Just keep making small adjustments until you get what you want - as well as a huge stack of "Crop Rectangle" entries in your history.  Still a bit of a pain but better than having to flip to Library and back again.  I usually can't get to the exact pixel size by dragging the crop handles, but can get close enough.

I've read the arguments against... but my use case is cropping to aspect ratio for 1 16:9 picture frame which has a physical resolution of 1920x1080. I want to ensure that im not cropping to LESS than 1920x1080 so I'd like to see the size while I'm adjusting the 16:9 rectangle. While I understand people's comments ideally I'd like software to do what **I** want it to do, not what you want it to do.

Would it be possible to add at some point the following enhancement to the crop tool in Lightroom,

when we use the crop tool, if we pull down or pull up from any corner we cannot see the size until we let go of the mouse, so we have to grab a corner again and adjust until we get the required size,

Can we have the floating height and width  .px so we can see what we are adjusting as we pull the corner up or down as described above, just like you can in Photoshop?

Thanks in advance

@defaultnw1cujcax44l 

For the meantime as mentioned above the solution is to use "Any Crop" by @johnrellis 

Download it here: Any Crop 

You can create a preset and always crop at those exact specific dimensions.

I work on a website. Our photos are 1620 x 1080 pixels.

When I'm cropping an image, I want the crop size to show in pixels as I'm doing it so I don't get smaller than 1620 x 1080. Guessing and checking is highly inefficient.

As I crop an Image it would be useful to me to know precisely how much I am cropping in real time.

By @C.Cella

So now you want a percentage of crop, not pixels? 

As I crop an Image it would be useful to me to know precisely how much I am cropping in real time.

It's an extra level of precision.

Knowing that I am cropping exactly 1-10-100-1000 pixels is more useful than guessing and or cropping back and forth because the Info window doesn't update in real time.

Again we already have the cropped dimensions displayable in LR but it's not done right, so it's just a matter of doing it right.

A Question.  Why would you want or need to crop to specific pixel dimensions for the original image?  It can't be for any asthetic reason.  There may be some reason I can't even imagine but I am guessing it is very rare that this is done/needed. For the few that need this there is AnyCrop.