There is also a way to measure the distance between various points. The ruler tool is probably the easiest solution especially if youve currently configured Photoshop under the view menu to snap to guides. Drag the tool to measure a pixel distance in the image or enter a value in the Pixel Length text box.
Bring the Info palette first then 1.
Select the Ruler tool. If you are on photoshop CS6 - Create a Marquee rectangle snapping from one point to the another. Place the black circle where you want to go and the distance will appear at the bottom-left of your display. When you measure from one point to another a nonprinting line is drawn and the options bar and Info panel show the following information.