The basic paper area and weight per unit area must be in the same unit (in²), and the resulting basis weight will also be in the same unit (lb).īy using the Basis Weight Calculator, individuals or professionals in the paper industry can quickly and accurately determine the weight of a given paper based on its area and weight per unit area. The result gives you the weight of the paper in pounds (lb).įor accurate calculations, it is essential to ensure that the units of measurement are consistent. To calculate the basis weight, you multiply the basic paper area by the weight per unit area. The basic paper area represents the total area of the paper in square inches (in²), while the weight per unit area refers to the weight of the paper in pounds per square inch (lb/in²). The formula used to calculate the basis weight is:īasis Weight = Basic Paper Area * Weight per Unit Area It is an important metric in the paper industry as it helps determine the thickness and density of the paper. Basis weight refers to the weight of a paper per unit area, typically measured in pounds per square inch (lb/in²). As the factors for the conversion lbs-grams are constants too, gsm turn out to be 1,695286 times the lb-value of our kraft.The Basis Weight Calculator is a tool used to determine the basis weight of paper. If we multiply the given lb-value with (0,453592*1000) we get the total ream weight in grams, which we divide by the ream constant to get gsm. If we do not know lbs nor gsm when buying a paper, we can roughly determine its thickness by measuring with a digital caliper, only slightly touching the paper´s edge.įor everyone interested, here are the steps for calculating gsm when knowing lbs (hopefully I did this properly):Īn easy calculation shows that a ream of kraft consists of 267,5607552 sqm of paper (480*24*36*2,54²/10000) this is a constant. Thus, when knowing gsm the paper weight in lbs is about 0,59 times the gsm-value. The paper weight in gsm turns out to be approx. Given the basis size of a ream of kraft and the lb-value, one can easily calculate gsm (grams per square meter) and vice versa. However, the lb-inch system is popular in the english-speaking part of the world only. (Some types of protective paper for use when painting are actually about a #60, and some other extra tough ones employed for the same use can even be #110.) Anything heavier than the #70 seems to be both rarely used and hard to find. "a number seventy kraft paper" (#70 kraft). Shell makers and other fireworks people frequently talk about e.g. Most pyrotechnic sources refer to kraft paper thickness giving the pound values. This is only a rule of thumb though, because two krafts can show differently dense material. Accidentally there is a relationship between the ream weight and the thickness (in inch) of a given kraft paper: The latter is the former divided by 10000. Unfortunately the basis sizes for a ream vary with the paper type, which means that two different kinds of paper can differ from each other in thickness, even if the same lb value is given on the packaging.Ī ream of kraft paper consists of 480 sheets of 24 inch by 36 inch (basis size). Generally paper thickness is described by giving the weight (in pounds) of a ream of paper. Kraft paper weights and thicknesses Paper weight #(lbs): It comes in large rolls and various thickness and can also be either virgin or recycled. This thick but inexpensive material is the basis for most fireworks articles. Kraft paper is the name for common brown paper of the type many shopping bags are made.
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