Estimate the paper mass of your print project

The short answer

Paper mass in kilograms = flat width in meters × flat height in meters × gsm × physical sheets ÷ 1,000. Gsm is grams per square meter, so area multiplied by gsm gives grams per sheet. DS Smith publishes this sheet-mass formula. Our print paper mass calculator handles the unit conversion.

The result is paper only, without ink, coatings, staples, envelopes or boxes. It's good for comparing options and planning deliveries, not for postage or an exact shipping weight.

Start with the correct paper number

A specification reading “80 lb” needs a paper family before you can convert it. US basis weight refers to a ream at that family's basic size; Domtar's paper glossary defines both terms. An 80 lb text stock and an 80 lb cover stock should not receive the same gsm input.

Ask for the stock's actual gsm or use our paper weight converter with the correct family. If the paper is specified only in points, ask for gsm rather than guessing from thickness. Keep the stock name beside the input so someone reviewing the result can check the assumption. Our paper weight guide explains the naming systems.

Worked example: 1,000 letter-size flyers

Take 1,000 finished 8.5 × 11 inch flyers on 148 gsm stock. Convert the dimensions to meters: 8.5 × 0.0254 = 0.2159 m and 11 × 0.0254 = 0.2794 m. The sheet area is 0.06032246 square meters.

Multiply that area by 148 gsm to get about 8.93 grams per sheet. For 1,000 physical sheets, the stock mass is about 8.93 kg, or 19.68 lb. Printing the reverse side does not create another sheet, so a two-sided flyer uses the same physical count in this stock-only estimate.

For folded pieces, use the unfolded sheet

A brochure folding from an 11 × 17 inch sheet to an 8.5 × 11 inch finished piece still contains the full 11 × 17 sheet. Entering only the closed size would count half its paper.

For 500 such sheets at 148 gsm, the stock estimate is again about 8.93 kg. Each sheet has twice the area of the flyer example, while the run has half the sheets. Folding changes its shape, not the amount of stock in it. Confirm the flat size on the job specification or the brochure fold calculator before calculating.

Keep sheets, leaves, and pages straight

For a simple loose document, a leaf is a physical piece of paper; its front and back can each be a page. A 12-page document printed two-sided therefore has six leaves per copy. At 100 copies, that is 600 physical leaves, assuming every leaf has the same size and stock.

A bound booklet needs its actual construction. Ask for the flat sheet count and sizes rather than entering the page number as sheets. Calculate a different cover stock separately from the interior, then add the two results. Our booklet page calculator helps plan page counts; the quote confirms the manufacturing specification.

Use the estimate to ask better delivery questions

If several locations need materials, write a quantity for each destination. The paper calculation can help compare those allocations, but the printer decides how finished pieces are packed. Ask for the expected carton count and packed weight if those matter to receiving, storage, or distribution.

When mailing, weigh and evaluate a completed sample with every insert and envelope included. Size, thickness, shape, and the selected mail service also need checking. Start with our mailing services conversation; a stock-mass result alone cannot determine eligibility or postage.

Check these details before using the result

• Dimensions and units

  Measure the flat piece being counted. Keep inches and millimeters distinct, and do not enter the closed fold size.

• Stock and physical count

  Confirm gsm and sheet count. Separate covers, inserts, or any stock with a different size or gsm into its own calculation.

• Purpose of the estimate

  Label the result “paper stock only.” Add distribution quantities and request a packed-weight estimate if the job needs one.

The calculator's “Use these specs in my quote” button carries your measurements into the request. Tell us what the pieces are, how they will be used, and where they need to arrive. That lets us discuss an appropriate paper choice and finishing plan alongside the arithmetic.

Calculate paper mass →