How to Cut Bathroom Mirrors

Cutting a bathroom mirror is a quick project.
Cutting a bathroom mirror is a quick project. (Image: man in bathroom mirror image by Leticia Wilson from

A standard object in most bathrooms, mirrors come in a variety of shapes and styles, either with frames or without. Many bathroom mirrors are simply long, rectangular sheets hung directly on the wall. Because bathroom sizes vary, mirrors often must be cut to fit into the space allotted for them. Cutting a bathroom mirror is not a difficult process, but it does require special glass-cutting tools.

Things You'll Need

  • Tape measure
  • Dry-erase marker
  • Glass-cutting oil or lubricating spray oil
  • Straight edge
  • Glass cutter
  • Work gloves

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Go into the bathroom where you'll install the mirror. Use a tape measure to determine the maximum width and length of the available space for the mirror and write down the dimensions. Decide if you want the mirror to take up all of the space, or whether you want it to be smaller.

Lay the mirror on a flat work surface with the reflective side facing upward. Use the tape measure and a dry-erase marker to mark the mirror in the location, or locations, where you want to cut it.

Drizzle a thin line of lubricating spray oil, or glass-cutting oil, along the marker lines. You only need to form a thin line, just enough to cover the cutter blade.

Place a straight edge on top of the mirror and align it perfectly with the marker line.

Put the tip of the cutter blade at the top of the marker line and press it up against the straight edge. Press down on the cutter blade with firm pressure and move it along the entire length of the line.

Set aside the glass cutter and the straight edge and put on a pair of work gloves. Pick up the mirror so the cut end is in one hand and the main body of the mirror is in the other. Snap the cut edge of the mirror downward with your hand to break it away from the mirror.

Repeat the process to cut any additional parts of the mirror.


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