Fabric density helps explain the thickness of textile products. It is a measurement that provides the base weight of the fabric, given as a value of grams per square metre. While the thread count is a measurement of the number of threads in a given area – that is, how tightly woven the threads are – the fabric density is another measurement indicating how much fibre is in a metre square, thereby allowing us to determine how strong and thick a fabric is.

Its primary use is to compare the weight of certain textile products for which the thread count does not provide sufficient information; for example, whether a given product is suitable for warm or cold seasons.