Paper Weight Calculator

Convert between paper weight systems including GSM, US Bond, Cover, Text, and Index. Understand equivalent weights across systems.

Weight Value

Weight System

GSM Equivalent

grams per square meter

Bond (lb)

Text (lb)

Cover (lb)

Index (lb)

Approx. Thickness (mm per sheet)

Paper Weight Conversion Factors

Bond basis: 17 x 22 in (1 lb bond = 3.76 GSM)

Text basis: 25 x 38 in (1 lb text = 1.48 GSM)

Cover basis: 20 x 26 in (1 lb cover = 2.70 GSM)

Index basis: 25.5 x 30.5 in (1 lb index = 1.81 GSM)

Thickness: approx GSM x 0.001 mm (varies by paper type)

Book spine from paper weight.

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