[header] How to drill a hole in tile using a tile hole saw [title] Measure the diameter of the hole you need to cut. [step] The best way to do this is by placing the pipe, faucet, or other fixture directly onto the tile and tracing its outline using a wax pencil. If this is not possible, you can measure the diameter of the fixture using a tape measure. 
Note that your cut will likely not need to be perfect, as the trim ring of the fixture will cover the cut edges of the tile. [title] Purchase the correct size tile hole saw.