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How to Cut a Memory Foam Mattress Topper

Updated April 13, 2018

A good night's sleep is crucial in this busy world. A memory foam topper is a great way to revitalise an older mattress, or soften a too-hard new one. Whether you make your own mattress topper or buy a pre-made one, you may have to trim it to fit. Most manufacturers make the foam topper a little larger than the actual mattress, which can make it difficult to use with your fitted sheets. Fortunately, trimming a memory foam topper is easy.

Decide what size mattress topper you need. Mattresses come in standard sizes, so if you don't know what size your mattress is, you can measure it. Few manufacturers still make full-sized beds, so if you have an older mattress, you will need to measure it. Here are the standard sizes: Twin: 39 inches by 75 inches (99 by 191cm) Long Twin: 39 inches by 80 inches (99 by 203cm) Full: 54 inches by 75 inches (137 by 191cm) Queen: 60 inches by 80 inches (152 by 203cm) King: 78 inches by 80 inches (198 x 203cm) California King: 72 inches by 84 inches (183 by 214cm)

Lay the memory foam out on a raised, flat surface, like your kitchen or dining room table. Make sure the edge you are cutting hangs over your table edge, so that you don't damage your table.

Use a permanent marker and a ruler or yardstick to mark the line you need to cut.

Use the electric knife or scissors to cut along the line you have drawn. Stop often to make sure that the foam is straight and that you are following the line correctly.

Tip

If you are using an electric knife, don't force it or you will get a jagged edge.

Warning

Do not try to cut memory foam that is more than 2 1/2 inches thick with scissors. If you are using an electric knife, follow all safety instructions.

Things You'll Need

  • Tape measure
  • Ruler or yardstick
  • Permanent marker
  • Scissors or electric knife
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About the Author

Emmy-award nominated screenwriter Brynne Chandler is a single mother of three who divides her time between professional research and varied cooking, fitness and home & gardening enterprises. A running enthusiast who regularly participates in San Francisco's Bay to Breakers run, Chandler works as an independent caterer, preparing healthy, nutritious meals for Phoenix area residents.