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Convert paper weight from GSM to lb or lb to GSM with our Paper Weight Conversion calculator. Compare Text, Cover, and Bond paper easily.
| Grade | Basis Sheet | Formula |
|---|---|---|
| Text / Book | 25 × 38 in | GSM = lb × 1.48 |
| Cover | 20 × 26 in | GSM = lb × 2.708 |
| Bond / Writing | 17 × 22 in | GSM = lb × 3.76 |
| 80 lb Grade | GSM Equivalent |
|---|---|
| 80 lb Text | ≈ 118.4 g/m² |
| 80 lb Cover | ≈ 216.64 g/m² |
| 80 lb Bond | ≈ 300.8 g/m² |
Paper weight can be confusing because paper uses different weight systems. GSM, or grams per square meter, measures paper by area. In the US, paper is often rated by basis weight in pounds (lb).
Our Paper Weight Conversion calculator makes this conversion simple. Choose the paper grade, enter the weight, and get the equivalent value in seconds. It works for Text / Book, Cover, and Bond / Writing paper.
This online paper weight calculator is useful for printing, publishing, packaging, stationery, and paper buying. It can also help you compare paper weight in lbs with g/m² (GSM).
The formula depends on the paper grade because each grade uses a different standard sheet size.
For LB to GSM:
GSM = Basis Weight (lb) × Conversion Factor
For GSM to LB:
Basis Weight (lb) = GSM ÷ Conversion Factor
For Text / Book paper, the factor is 1.48.
GSM = lb × 1.48
lb = GSM ÷ 1.48
For Cover paper, the factor is 2.708.
GSM = lb × 2.708
lb = GSM ÷ 2.708
For Bond / Writing paper, the factor is 3.76.
GSM = lb × 3.76
lb = GSM ÷ 3.76
These formulas form the core of our American paper weight conversion calculator.
A paper weight conversion chart helps you compare common paper grades.
For example, 80 lb Text converts to:
80 × 1.48 = 118.4 GSM
But 80 lb Cover converts to:
80 × 2.708 = 216.64 GSM
This shows why you should always select the correct paper grade. The same paper weight in lbs can have a different GSM value.
The calculator handles the conversion automatically, so you don't need to use a paper weight conversion table or perform the formula by hand.
Suppose you want to convert 65 lb Text paper to GSM.
The Text / Book conversion factor is 1.48.
GSM = 65 × 1.48
GSM = 96.2
Therefore, 65 lb Text paper is equivalent to 96.2 GSM using this calculator's conversion factor.
Now suppose you want to convert 250 GSM Cover paper to pounds.
lb = 250 ÷ 2.708
lb = 92.3186
Therefore, 250 GSM Cover paper is approximately 92.32 lb Cover.
The Paper Weight Conversion calculator provides a quick way to convert paper weight between GSM and pounds. It supports Text / Book, Cover, and Bond / Writing grades with their correct conversion factors.
Instead of checking a paper weight conversion chart or table, you can enter your value and get the result instantly. This makes it useful for printers, designers, publishers, packaging users, and anyone comparing paper weight in lbs and GSM.
Paper weight describes the weight of a standard amount of paper. It may be expressed as GSM or as US basis weight in pounds.
GSM means grams per square meter. It tells you how many grams one square meter of paper weighs.
Select the correct paper grade and divide GSM by its conversion factor.
No. Paper weight in pounds and GSM use different measurement systems. The paper grade also affects the conversion.
Using the calculator's Text factor of 1.48:
80 × 1.48 = 118.4 GSM.
For this calculator, the core formula is GSM = lb × factor, while the reverse is lb = GSM ÷ factor.