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How to Measure a Foam Mattress

Before you purchase new bedding, it is important to know what size foam mattress to shop for. You may not know what size foam mattress you own if your mattress is a hand-me-down, or perhaps it has been so long since you purchased bedding you have forgotten the size. No matter what the reason, you need to get an accurate measurement of your foam mattress to ensure that the fitted sheet will stay on the bed and that your bedspread will cover your bed.

Things You'll Need

  • Measuring tape
  • Paper
  • Pencil or pen
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Instructions

    • 1

      Remove all bedding from your foam mattress, including all sheets, blankets and pillows.

    • 2

      Measure from the top left to the top right side of the foam mattress using a measuring tape. Write this measurement down as the width of the foam mattress.

    • 3

      Measure the height of one of the sides of your foam mattress; it doesn't matter which side. When measuring the height of the mattress, measure from the top of the mattress to the bottom of the mattress. Round up to the nearest inch. Record this measurement.

    • 4

      Measure the foam mattress from the head of the foam mattress to the foot of the mattress. Record this number as the length of the foam mattress.