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Basis Weight from Grammage

This calculator determines the basis weight (in pounds) for a ream of a given basic size and grade of paper based on its weight in grams per square meter (see the example below). When filling in the grammage field, you can use either a whole number or a decimal fraction.

For a table of select standard paper weights given in both pounds and grams, see our Equivalent Weights & Grammage Chart.

GRAMMAGE-TO-BASIS-WEIGHT CALCULATOR
Grams per Square Meter:	g
Select...   Paper Grade/Basic Size: Bond (17 x 22) Book and Offset (25 x 38) Tag (24 x 36) Index (25.5 x 30.5) Vellum Bristol (22.5 x 30.5) C1S and C2S SBS (24 x 36) Coated Cover C2S (20 x 26) Litho C1S Label (25 x 38) Opaque Cover (20 x 26) Recycled Board (288 sq. in.)   (Or type in values below.)
Basic Size:	×    (height × width)
Basis Weight =	lbs.

Disclaimer:

The numerical results from this calculator are estimates only and are not guaranteed by Case Paper Company as accurate in all situations.

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Example

Find the basis weight in pounds for a ream of 25" × 38" Book paper that weighs 67.3 grams per square meter.

Formula:

Grams per m2 × Basic Size  1406.5

=

Basis Weight (lbs.)

Equation:

67.3 × (25 × 38)  1406.5

=

45 lbs. (45.46 rounded to the nearest whole number)