Paper weight conversion calculator from LB to GSM

LBS to GSM – U.S. to international paper weight conversion – equivalent weights & conversions

Paper stock, also called paper weight, refers to the thickness and sturdiness of paper used in printing. The weight of paper stock is determined using a scale that measures either the weight of the paper in pounds (LB) or in grams per square meter (GSM). 

Cloudprinter's default measurement system for paper thickness is the metric one - GSM. However, paper stocks are measured differently in the United States compared to foreign manufacturers due to differences in measurement systems across the world. 

The imperial measurement system used in the U.S. measures what is called the “basis weight” to determine the paper stock. Basis weight refers to the weight in pounds for a full ream (500 sheets) of standard-size paper. For book (text) paper, the basis size is 17” x 22”, while the standard size for cover paper is 25” x 38”. For example, a 20 lb. bond paper means that 500 sheets of this paper stock at its standard size of 17″ x 22″ weighs 20 pounds.  

To convert the paper stock in pounds to grams per square meter, the following formula could be used:

1lb. of Text paper = 1.48 gsm. Multiply each pound of text paper by 1.48.

1 lb. of Cover paper = 2.708 gsm. Multiply each pound of cover paper by 2.708.

For example:

80lb. text = 118.4 gsm

80lb. cover = 216.64 gsm

Examples of paper weight conversions 

Book (Text)


Basis Wt. 17” x 22”


Basis Wt. 25” x 38”


30 lb. 

44 gsm 

50 lb. 

135 gsm 

40 lb. 

59 gsm 

60 lb. 

163 gsm

45 lb. 

67 gsm 

65 lb. 

176 gsm

50 lb.

74 gsm 

80 lb. 

216 gsm

60 lb. 

89 gsm 

90 lb. 

243 gsm 

70 lb. 

104 gsm 

100 lb. 

271 gsm 

80 lb. 

118 gsm 

110 lb. 

298 gsm 

90 lb. 

133 gsm 

130 lb. 

352 gsm

100 lb.

148 gsm

160 lb. 

433 gsm 

Use cases for different paper weights and stock options

Hereby are a few examples, of how Cloudprinter’s Print Partners from North America handle the mapping of paper stock from LB to GSM for books:

Stock requested by Cloudprinter (books)

Stock used by Print Partner (books)


40# Finch Text


60# Williamsburg Text


60# Uncoated White Text


60# Uncoated Cream Text


100# Endurance Gloss Text


100# Endurance Silk Text or 80# Matte Text


80# Sterling Gloss Cover


80# Sterling Silk Cover 


12pt C1S Cover


100# Endurance Gloss Text

If you have any questions or concerns regarding paper weight conversion - feel free to contact your Account Manager from