In the metric system, kilograms per cubic meter (kg/m3) are used to find density, though other units, such as pounds per cubic foot are also used.
For a complete list of units used to find density, visit the Related Link.
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In the SI system the unit for density is the kilogram per metre cubed or kg/m^3.
Length would be the most appropriate unit of measurement
To measure the width of bed, the unit meter can be used. It can also be measured in feet and inches.
The SI unit for mass measurement is the kilogram (kg).
I personally use the pound avoirdupois.