Knot per square inch or knot density – number of knots per square inch is a vital indicator of carpet quality. Majority of the weaves are measured basically by counting the number of knots for every linear inch alongside the warp (i.e., by the side of the length of the rug and the number of knots for each linear inch next to the weft – across the breadth of the rug throw and multiply to get the number of knots per square inch. Pile Density (related to knot count) affects the durability of carpets. Tight, unyielding and dense pile helps the carpets to endure wear. A simple test- If your fingers dig into the pile with effort and you are not able to hit the bottom, the carpet is said to be made with dense pile and vice versa.
Many merchants try to sell knot count as an appraiser of quality. Although it’s right that a higher KPI means that the piece of rug was made in a longer duration, there are many other factors to reflect on. Knot counts in rugs can differ from as low as forty per square inch to a staggering 1200. Knots resemble the pixels on a computer screen. The more the knot count, the better the resolution or clarity of the picture. Likewise, detailed patterns in rugs are dependent on higher knot counts. Rounded designs demand really high knot counts. Geometric patterns can usually do with far lesser knot counts and yet be very high worth pieces.