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Grammage from Basis Weight

This calculator determines the weight (in grams per square meter) for a ream of a given basic size and grade of paper based on its basis weight in pounds (see the example below). When filling in the basis weight 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.

BASIS-WEIGHT-TO-GRAMMAGE CALCULATOR
Basis Weight:	lbs.
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)
Grams per Square Meter =	g

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 weight in grams per square meter for a ream of 25" × 38" Book paper that has a basis weight of 45 lbs.

Formula:

Basis Weight × 1406.5  Basic Size

=

Grams per Square Meter

Equation:

45 × 1406.5  (25 × 38)

=

67 g/m2 (66.62 rounded to the nearest whole number)