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How to Convert Basis Weight to Grams per Square Meter

To convert basis weight of a given standard size of paper to grams per square meter, multiply its basis weight by 1406.5 and divide the results by the square area of its basic size.

 

Online Calculation
Basis Weight:
Basic Size: (square inches)

Basis Weight Conversion GSM


Rounding Rules

Sheet Size

Ream Weight

864 inches2 or larger Ream Weight calculated to nearest pound.
(166 lbs.)
336 inches2 to 864 inches2 Ream Weight calculated to nearest half pound.
(166.5 lbs.)
Less than 336 inches2 Ream Weight calculated to nearest one hundredth of a pound. (166.55 lbs.)


   Basic Sizes

Bond

17 x 22 = 374 square inches

Book & Offset

25 x 38 = 950 square inches

Tag

24 x 36 = 864 square inches

Index

25.5 x 30.5 = 778 square inches

Vellum Bristol

22.5 x 28.5 = 641 square inches

Coated Cover 1S/C2S

24 x 36 = 864 square inches

Coated Cover C2S

20 x 26 = 520 square inches

C1S Label

25 x 38 = 950 square inches

Opaque Cover

20 x 26 = 520 square inches



Formula
Basis Weight x 1406.5
Basic Size


Example

Convert 17 x 22, 28 lb. Bond/Writing paper to grams per square meter.

28 x 1406.5
374

TO OUR VISITORS: The results of the Interactive Calculations System are estimates and are not guaranteed by International Paper.