in schematic the unit is no use, it is pixel , you can think it is 10mil

@dillon Thank you very much Sir :D

To clarify: ## Schematics with a Border ### Ruler If an A4 to A0, USLetter, USLegal (A) or USLedger (B) Border is put around the schematic then the Ruler across the top and left hand side of the schematic camvas is scaled to 1 division = 10mil (0.01 inch). For example: A4: ![enter image description here][1] A3: ![enter image description here][2] ### Grid The grid on the canvas is then on a 5mil (0.005 inch) spacing. ## Borderless schematics If there is no border around a schematic then the ruler and the grid are unitless (i.e they are dimensionless) because there is no direct relationship between schematic symbols and their position within the schematic and the dimensions of physical components and their placements on the PCB. Therefore physical dimensions have no meaning within a schematic. The ruler and the grid are used only for positional references of elements within the schematic camvas. [1]: /editor/20171022/59eb7d4961a35.png [2]: /editor/20171022/59eb7dee510db.png

@andyfierman Thank you very much for the explanation.