This example image is 200px x 200px. If you don't know it, you can find the size by clicking Image > Canvas Size
The Crop Tool options show the X and Y position of the top left corner of the crop, and the X and Y size of the crop. So it's simple arithmetic to work out the distances.
LLeft = 33px
UUp = 49px
RRight = 200-33-129 = 38px
DDown = 200-49-96 = 55px