The top is the very crown highest point of the mattress.
How to measure a mattress height.
Measure from the bottom of the foundation not the floor to the top of the mattress.
How to properly measure the length width and depth of your mattress and box spring.
Then use a measuring tape to measure the length of your bed from the top edge straight down to the bottom edge.
Use a tape measure to determine the size of your mattress and box spring in inches.
Measure from the bottom to the top of your mattress to get the height.
Pairing a thick mattress with a high foundation may make it difficult to get in and out of bed.
The critical thing is to consider the total height of your bed setup.
People often assume the upper seam is the top of the mattress it s not.
Typical mattress pocket depths vary from 8 to 18 inches and box springs usually measure 8 to 12 inches deep.
Otherwise only measure the height of the mattress itself.
To measure your bed start by stripping the bedding so you can accurately measure it.
Measure in inches from the bottom where it rests on the box spring to the top of the mattress including any pillow top.
If necessary repeat for box spring.
Next measure the width by seeing how long your bed is from the left edge straight across to the right edge.
If you only measure up to the upper seam the actual bed height could be off by as much as 3 inches.
The average height of a mattress plus foundation and frame is around 25 inches though it can be more or less depending on your height and personal preference.