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Here you will find useful information to aide your paper estimates regarding cost and usage. Any questions about calculations can be directed to your Roosevelt sales representative at 1 (800) 523- 3470 or through our easy to use chat function.
Determine the weight of 1,000 sheets (M-weight) of a given sheet size, using length, width and basis weight.
Rounded ream weight = (Area of given sheet size x Basis weight) / Area of paper
M-Weight = Rounded ream weight x 2
The below is an example M-Weight calculation for a sheet of 11” x 17” book paper with a basis weight of 70 lbs.
Rounded ream weight: (11” x 17”) x 70 lbs. / (25” x 38”) = 13.78 lbs.
M-Weight: 13.78 lbs. x 2 = 27.56 lbs.
Ream weight rounding guidelines: The area of the given sheet size is 11” x 17” = 187 sq. in. Since this is less than 336 sq. in., ream weight should be rounded to the nearest hundredth of a lb.
Please keep in mind, depending on the mill, different methods to calculate M-weight may be used.
All M-weights can vary in basis weight, especially in products of a higher caliper such as SBS and recycled board.
*All results are estimates only. Reach out to your Roosevelt sales representative to confirm.
Find the basis weight for a ream of paper, based on its weight in grams per square meter (GSM).
Basis Weight = (Area of paper x Grams per sq. meter) / 1406.5
The below example is a basis weight calculation for a ream of 25” x 38” book paper that weighs 67.3 grams per sq. meter.
Basis Weight: (25” x 38”) x 67.3 / 1406.5 = 45 lbs.
Basis weight rounding guidelines: Results are rounded to the nearest whole number.
*All results are estimates only. Reach out to your Roosevelt sales representative to confirm.
Find the weight in grams per square meter (GSM) for a ream of paper based on its basis weight.
Grammage = (Basis weight x 1406.5) / Area of paper
The below example is a grammage calculation for a ream of 25” x 38” book paper that has a basis weight of 45 lbs.
Grammage: 45 x 1406.5 / (25” x 38”) = 67 grams per sq. meter (GSM)
Grammage rounding guidelines: Results are rounded to the nearest whole number.
*All results are estimates only. Reach out to your Roosevelt sales representative to confirm.
Estimate the number of pages per inch of paper (PPI) based on the sheet’s thickness (caliper).
PPI = 2 / Caliper
The below example is a PPI calculation for 100# gloss coated cover with an average caliper of .0095 inches per sheet.
PPI: 2 / 0.0095 = 211 pages per inch (PPI)
PPI rounding guidelines: Results are rounded to the nearest whole number.
*All results are estimates only. Reach out to your Roosevelt sales representative to confirm.