Lbs vs GSM
Paper weight is measured in two main ways: pounds (lbs) and grams per square meter (GSM), and the difference lies in how each system defines the weight. Pounds are primarily used in the United States and refer to the weight of a ream (500 sheets) of uncut paper based on the type and size of the paper’s original sheet. Because different paper types (like text, bond, or cover) have different base sizes, the same pound rating can feel very different across types. In contrast, GSM is a metric measurement used internationally and represents the weight of one square meter of paper, regardless of its type or intended use. This makes GSM a more consistent and straightforward way to compare paper weights across categories and brands.
Download the printable PDF chart for reference: Paper Chart
Paper is defined in pounds (lbs) or GSM (grams per square meter) based on different regional systems and historical practices:
Pounds (lbs) – U.S. System
- Used primarily in the United States.
- Refers to the weight of 500 sheets (a ream) of a specific size before it’s cut down to final dimensions (like 8.5″x11″).
- Different base sheet sizes exist for different paper types:
- Bond paper: 17″ x 22″
- Cover stock: 20″ x 26″
- Text paper: 25″ x 38″
- Because the base sizes vary, two papers with the same pound rating can feel very different (e.g., 80 lb text vs. 80 lb cover).
GSM (grams per square meter) – Metric System
- Used internationally.
- Measures the actual weight of the paper based on one square meter of it.
- More consistent and easier to compare across types, regardless of the paper’s purpose (text, cover, etc.).
Summary:
- Pounds = historical + format-dependent (less consistent)
- GSM = metric + weight per unit area (more consistent)
If you’re buying paper for crafting or printing, GSM offers a clearer and more consistent way to compare weights across brands and paper types. However, GSM is not commonly used or widely understood in the U.S., where pounds (lbs) remain the standard. To make things easier, print out the PDF conversion chart above—it’s a handy reference to keep in your craft room or near your printer.
