If you’ve ever gone shopping for a handwoven Persian rug, you’ve probably heard carpet sellers emphasize the term “Raj”. While the colors, patterns, and origin of a rug are important, Raj count—the measure of knot density—is one of the most crucial indicators of a rug’s value, quality, and finesse.
But what exactly is Raj, and how does it influence the price and prestige of a Persian carpet?
In traditional Persian carpet weaving, Raj is a time-honored unit used to measure the knot density of a rug. Specifically, it refers to the number of knots within 7 centimeters of the carpet’s width (in the Tabriz system). The origin of this measurement is linked to the ancient unit of “zar” (ذَرع), which is approximately 112 cm.
Since 1 Raj = 1/16th of a zar, this comes to 7 cm. So, to calculate the Raj count, we count the number of knots in every 7 cm. The higher the Raj number, the more knots, and therefore, the finer and more valuable the rug.
Measuring the Raj count is simple. Flip the carpet over, place a ruler across 7 centimeters of the width (preferably near the center), and count the number of knots along that line.
This knot count reveals how fine or coarse the weave is:
A higher Raj means finer detail, more labor, and usually a higher price.
A lower Raj indicates a coarser weave, which may still be beautiful, but generally less expensive.
For consistency, always measure along the width, since Persian rugs are woven horizontally. Uniformity in Raj count across the rug also signals higher craftsmanship.
Several factors affect whether a rug is fine (rizbaft) or coarse (doshtebaft):
Type of warp: Finer warps made from thin, closely spaced threads allow for more detailed work.
Type of yarn: Thin weft yarns (like silk or kork wool) enable tighter knotting.
Weaver skill and available time: Finer rugs take significantly longer to weave and require higher expertise.
Local tradition: Different regions of Iran have varying standards for what is considered “fine.”
Since finer rugs contain more knots, weavers are usually paid based on the total number of knots tied, not just size. That’s why high-Raj carpets are more expensive and time-consuming to produce, but also more durable and detailed.
While Raj is commonly used in Tabriz, other cities use different terms:
In Nain, the term “La” is used to indicate yarn thickness. For example, a 9-La carpet is coarser than a 6-La one.
In Isfahan, knots are sometimes counted per 6.5 cm instead of 7.
Outside of Iran, density is usually expressed as:
Knots per square meter (KPSM)
Knots per square foot
Each method essentially aims to measure the same thing—how many knots are packed into a given space—but with slightly different tools and units.
“Raj” may seem like just a technical term, but it speaks volumes about a carpet’s quality, detail, price, and labor intensity. The higher the Raj, the finer the rug. While coarser weaves can still be beautiful and durable, finer ones reflect master craftsmanship and investment.
Which type of weave do you prefer—fine or coarse?
We’d love to hear your thoughts or experiences in the comments below.
Principles of Carpet Design: Color, Patterns, and Paper The carpet industry comprises various components; carpet design is the first step in production and weaving. If the carpet pattern is not
Historical and Cultural Significance of Qom Rugs Originating in the historic city of Qom, these exquisite rugs have a storied legacy that stretches back centuries. Qom, a city celebrated for
Persian carpets have a natural place in British interiors, but their connection with Britain goes far beyond interior decoration. Persian carpets have been admired in Britain for centuries, and exceptional
Wool is one of the most essential and foundational materials in the art of Persian carpet weaving. It is used both in the pile and warp and weft of the
Persian carpets have a natural place in Qatar’s interiors, particularly in spacious homes, majlis rooms, villas, and formal reception areas. Their handmade construction, natural materials, regional variety, and artistic character
History and Origin of Bidjar Rugs Bidjar rugs hail from the town of Bijar (Bidjar) and surrounding villages in the Kurdistan region of northwestern Iran. The area is inhabited largely
From Paisley to Geometric: Exploring Iranian Carpet Designs Carpet Is an integral component in every home that can create harmony among colors. Even though wooden furniture and services have found
As a family-owned Persian carpet shop, we bridge the gap between passionate collectors and skilled weavers, supporting both the artistry and the heritage of this timeless craft.
We guarantee fair prices for Original Authentic Persian Carpets
GD 04, Dragon Mart 2 –
Dubai – United Arab Emirates
No.36 – 10th st. – Hafez Ave. – Shiraz , Iran
Block 19 – Kooye Mohandesan –Kish Island, Iran
Email [email protected]
We bring you not just a carpet, but a masterpiece with a story — directly from the hands of Iranian artists to your home.
By working directly with artisans, we help preserve centuries-old traditions while offering our customers a chance to own a unique piece of original cultural heritage.
