The density of the fabric is called the number of yarns per unit length (the number of wefts and warps) in the width and length direction of the fabric. Knitted fabrics are based on the number of horizontal and vertical rows. The weft and warp density is calculated by counting the longitudinal and transverse yarns of the fabric 1 centimeters. The number of longitudinal ones indicates the warp yarn density and the number of transverse ones indicates the weft yarn density. While the weft and warp density is found in laboratory conditions, measurements are made on 5 centimeters and the value is divided by five to determine the frequency.

For the number of warp threads, the width of the fabric as well as the edges and the ground warp densities are important. The length and weft density of the fabric is also important for the number of weft yarns.

It is very difficult to measure the distance of any fabric between threads. The fabric density is therefore calculated as the number of yarns per unit length. The density value of the fabric is also related to the condition of the fabric at the time of measurement. It is important whether the fabric is on the loom or whether it is raw or finished fabric. Weft and warp density counts are made on weaving loom, raw fabric and finished fabric.

If the yarn density is high, the strength of the fabric is high. The weight of the fabric is high. The fabric becomes more stable and tough. Yarn slippage is less.

For physical tests performed in accredited laboratories, standards issued by local and foreign organizations are complied with. In this context, the following standards are used in fabric density tests:

• TS 250 EN 1049-2 Textile woven fabrics - Structure analysis methods - Part 2 - Determination of yarn count per unit length
• BS 2862 Methods for determining yarn count per unit length
• ASTM D3775-12 Standard test method for weft and warp count of woven fabrics
• ASTM D3887 Standard specification for knitted fabric tolerances