How to measure your mattress size? (width x length x height)
Measure the width: With your tape rule, determine the width of your mattress in inches from one side to the other
Measure the length: With your tape rule, determine your mattress length in inches from head to foot.
Estimate the height: Measure the height of your mattress from the box spring’s bottom up to the top of the mattress. Standard mattress sizes have a height of 11 inches.