Maker Label Studio Manufacturing & Materials

Paper GSM / Basis Weight Converter

Convert printing paper weight between gsm and basis pounds by stock type, then estimate ream weight and M-weight from the sheet size.

Inputs

Use the stock's basic size for the basis-weight conversion and the actual sheet size for weight estimates.

Ream weight uses 500 sheets. M-weight is reported in pounds per 1,000 sheets.

Results

Calculation follows: gsm = basis weight(lb) x 1406.5 / basic-size-area(in2).

Maker Label Studio
Primary conversion
n/a
GSM n/a
Basis lb n/a
Ream weight n/a
M-weight n/a
Actual sheet area n/a
Stock basic size n/a
Input summary n/a
Cited category: Manufacturing & Materials. Ream weight = gsm x sheet area(m2) x 500 / 1000. The basic size depends on stock, such as bond 17 x 22, text 25 x 38, and cover 20 x 26.

Self-tests

Golden cases verify the same pure conversion functions used by the calculator.

Self-tests: not run

About the Paper GSM / Basis Weight Converter

Paper GSM conversion helps printers, designers, and packaging buyers compare grammage with basis weight when stock types use different basic sheet sizes. By selecting the paper category, users can translate pounds to grams per square meter, estimate ream or M-weight, and avoid specifying a text, cover, or bond sheet by weight alone.

How it works

  1. Choose the paper stock category, such as bond, text, cover, or index.
  2. Enter GSM, basis weight, sheet size, or ream quantity.
  3. Convert between grams per square meter, pounds, ream weight, and M-weight.
  4. Compare results with caliper and finish before specifying final stock.

Frequently asked questions

Why does the same basis weight feel different across paper types?

Basis weight is tied to a stock category's basic sheet size. Because bond, text, cover, and index stocks use different basic sizes, the same pound value can represent different grammage.

Is GSM the same as paper thickness?

No. GSM measures mass per area, while thickness is caliper. Coating, fiber, density, and finish can make papers with the same GSM feel different.

What is M-weight in printing?

M-weight is the weight of 1,000 sheets at a specified sheet size. Printers use it for estimating freight, postage, and paper ordering.

Can I convert any paper using one universal pounds-to-GSM factor?

No. The conversion depends on the basic size for the paper category. Always select the correct stock type before converting.

Should packaging board be compared by GSM only?

Not usually. Packaging performance also depends on caliper, stiffness, burst, compression, coating, and fiber construction.

References