How to Cut Plate Glass Mirrors


Sometimes it's necessary to make a cut to a plate glass mirror to get just the right look or fit. The key to cutting plate glass lies in scoring the glass and “running,” or breaking, the score. Running and scoring can be a tricky process, so plan a few practice runs on scrap plate glass before tackling your mirror. Take your time and concentrate to make the cleanest possible cut.

Things You'll Need

  • Plate glass mirror
  • Glass cleaner
  • Terry cloth towel
  • Steel wheel cutter
  • Ruler or yardstick (optional)
  • Spray bottle of water
  • Running pliers (optional)
  • Fingernail polish


  • Clean the plate glass mirror with glass cleaner thoroughly, making sure it is completely free of dirt and grime. Even minuscule particles can cause imperfections in your score, which might lead to chips or voids in your cut.

  • Place a terry cloth towel on your work surface to help prevent scratches on the glass.

  • Place the mirror on your work surface so the reflective side faces up.


  • Hold the steel wheel cutter firmly on the reflective side of the glass so the cutting wheel is upright and vertical.

  • Make your score with the steel wheel cutter. A score is basically a deep scratch in the glass. Use moderate downward pressure and roll the wheel along the line you wish to cut. Guide the wheel with a ruler or yardstick for a straight cut. You should hear a slight screeching sound as you cut.

  • Wet the finished score with water, misting it with a spray bottle.


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  • Photo Credit Jupiterimages/Creatas/Getty Images glass cleaner image by Randy McKown from nail polish image by Miroslav Beneda from
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