What Does Knots Per Square Inch (KPSI) Mean & What Does It Say About a Rug?

What Does Knots Per Square Inch (KPSI) Mean & What Does It Say About a Rug?

Knots Per Square Inch (KPSI) might sound technical, but it’s an important term to know when buying a rug. Persian and oriental rugs are valued by their quality, material, design, and also the number of knots per square inch. Also known as KPSI, this measurement is used to determine the density and craftsmanship of a rug. In this article, we’ll explain what KPSI means, why it matters, and how to use this information to choose the right Persian rug for your home.

tying knots kpsi rug thread fibers for higher quality

What to Know About Knot-Count

When was the last time you bought a rug? Did you happen to pay attention to the knot count? Do you know why—and if—it matters? If you are like most consumers, this might be your first introduction to knot counts and what it means for your rug. Think of it this way: a higher thread count often correlates with higher-quality sheets. It’s the same concept for knot counts and rugs!

KPSI, or Knots Per Square Inch, measures how many knots are tied within one square inch of the rug. This metric is important because it helps determine the rug’s quality, strength, and intricacy of design. Rugs with a higher KPSI often have more detailed patterns and will typically last longer.

Knot-Count & Rug Types

Let’s break down what different knot counts mean for your rug. Rugs with a high KPSI have intricate patterns and finer details that make them stand out. Medium KPSI rugs strike a good balance between detail and strength and are considered a practical choice. 

Low KPSI rugs, on the other hand, are known for their bold patterns and excellent strength. They might have a different level of detail than high KPSI rugs, but they can handle heavy foot traffic and are perfect for busy areas in your home or place of work.

Knot Density & Strength

The density of knots in a rug plays a big role in its overall strength. A higher knot density means the fibers are tightly woven, making the rug sturdier and more resilient. This means it might last longer than a low knot-density counterpart. This tight weave also affects the rug’s feel, giving it a smoother, more luxurious texture underfoot. 

Additionally, higher knot density allows for more detailed and intricate patterns, increasing the rug’s perceived visual appeal. So, if you’re looking for a rug that feels great and looks stunning, paying attention to knot density is a must.

What to Look For When Buying a Rug

While understanding KPSI is helpful when purchasing a rug, it isn’t the only thing to consider. Here are some other factors that should be at the top of your mind.

  • Material
  • Size and shape
  • Color and pattern
  • Intended use
  • Cleaning and maintenance requirements
  • Price and budget
  • Origin and craftsmanship
  • Comfort and feel
  • Warranty or guarantee

Visit Persia Oriental Rug Gallery in Shrewsbury, MA or Shop Our High-Quality Rugs Online!

At Persia Oriental Rug Gallery, we pride ourselves on offering a wide selection of high-quality rugs at affordable prices. With over 40 years of experience selling, authenticating, cleaning, and repairing Persian rugs, we are the go-to source for all your rug needs. We can help provide all the information you need to make an informed decision, from knot density and origin to material and design. To learn more and view our collection, visit our showroom in Shrewsbury, MA, or shop online today!