How to Choose the Right Paper Stock for Your Book Project

2026-06-10 Β· Qicai Press Blog

Paper is usually the single largest material cost in a book printing job, and it is also the thing your readers physically touch. This guide explains how gsm, opacity, bulk, shade, and coating work, and gives practical paper pairings for the book types we print most often.

Understanding gsm: the number that defines your paper

gsm stands for grams per square metre β€” it is the weight of a one-metre-by-one-metre sheet of that paper. Every paper specification in commercial printing starts here. A 70 gsm sheet feels thin and light; a 300 gsm sheet is a stiff card. When you see a book described as "128 gsm matt art paper inside, 250 gsm cover," those two numbers tell a printer most of what they need to quote the job.

Higher gsm is not automatically better. Heavier paper costs more, weighs more to ship, and makes thick books uncomfortable to hold. The goal is to match the paper to the content and binding, not to maximize the number.

The common book papers you will be choosing from

Uncoated offset paper (60–120 gsm)

This is the standard text paper for black-and-white and text-heavy books. It has a natural, slightly textured surface, takes ink well, and is easy to write on β€” which is why it is the default for novels, workbooks, exam papers, and most textbooks. Most of our text pages for novels and school books run on 70–80 gsm offset.

Coated art paper (105–157 gsm)

Coated paper has a mineral layer that gives it a smooth surface, available in gloss or matt (silk) finishes. Ink sits on top of the coating instead of soaking in, so photographs and illustrations reproduce with sharper detail and richer colour. It is the standard choice for children's picture books, art books, catalogues, and cookbooks.

Bible paper (28–50 gsm)

Also called India paper or lightweight offset, this is an extremely thin but surprisingly opaque paper designed for very high page counts β€” Bibles, dictionaries, hymnals, and reference works that would otherwise be unmanageably thick. It requires careful press handling and is normally printed by factories experienced with it.

Art card (200–350 gsm)

Heavier coated board used mainly for paperback covers, children's board books, and endpapers. A 250–300 gsm art card with lamination is the typical paperback cover specification.

Opacity and show-through

Opacity measures how much of what is printed on one side of a sheet is visible from the other side. Show-through is most noticeable on thin papers and on pages with heavy ink coverage or large black areas. Two papers with the same gsm can have quite different opacity depending on their filler content and how densely they are made β€” this is why bible paper at 40 gsm can outperform a cheap 60 gsm offset. If your book has dense images or bold headings on every page, ask for an opacity check on your chosen stock, or step up one weight.

Bulk, caliper, and spine width

Bulk (or caliper) is the physical thickness of the paper, measured in microns. It matters because the total thickness of your book block determines the spine width β€” and the cover file cannot be finalised until the spine width is known. Papers with the same gsm can bulk differently: a bulky 80 gsm uncoated sheet can be noticeably thicker than a dense 80 gsm coated sheet. Changing paper after your cover is designed means redoing the cover, so finalise the paper and page count first. Your printer should calculate the exact spine width for you before you submit cover artwork.

Cream vs white, coated vs uncoated

Cream (natural) paper is warmer and easier on the eyes over long reading sessions, which is why most novels use it. White paper gives higher contrast, suits diagrams and colour images, and looks cleaner for textbooks and business books. Note that "white" uncoated offset is rarely as bright as coated white paper.

The coated vs uncoated decision comes down to content. Coated paper reproduces photos and fine colour detail better but has glare, shows fingerprints on gloss finishes, and is harder to write on. Uncoated is cheaper, glare-free, writable, and ideal for text. Many books mix both: uncoated text pages with a short coated insert for colour plates.

Recommended pairings by book type

  • Novel / trade paperback: 70–80 gsm cream uncoated offset inside; 250–300 gsm art card cover with matt or gloss lamination.
  • Textbook / workbook: 70–100 gsm white uncoated offset (80 gsm is the workhorse); heavier stock if there is two-colour printing throughout. Writable surface is essential for workbooks.
  • Children's picture book: 128–157 gsm matt art paper inside; hardcover over greyboard, or a self-cover for slim titles. Board books use laminated art card sheets mounted together.
  • Bible / hymnal / dictionary: 28–40 gsm bible paper for very high page counts; 45–50 gsm if the page count is moderate and more opacity is wanted. Pair with a flexible binding (sewn, with limp or case cover).
  • Coffee table / art book: 128–157 gsm gloss or matt art paper; 157 gsm when you want a substantial feel and minimal show-through on full-bleed photography; usually a hardcover with a printed paper-over-board case and jacket.

How paper choice affects your cost

  • Paper is priced by weight. Moving from 70 gsm to 80 gsm text paper increases your paper tonnage by roughly 14% on a like-for-like basis β€” and paper is often the biggest single line in a quote.
  • Coated costs more than uncoated at similar weights, and bible paper, despite being light, is a specialty grade that costs more per tonne than standard offset.
  • Heavier paper raises shipping cost. For overseas buyers, freight is significant: a container of 157 gsm art books weighs far more than the same title count on 80 gsm offset. Weight also affects courier costs for sample copies.
  • Standard sizes save money. Sticking to common sheet sizes and standard book formats reduces paper waste, which directly lowers your unit price.
  • Ask for alternatives. A good factory can often suggest a paper one grade down that still meets your quality target β€” or flag where saving a few cents per copy will visibly hurt the product.

Practical next steps

Before requesting a quote, decide on your page count, whether the interior is black-and-white or colour, and your target reader experience. Then ask your printer for paper dummies and printed samples on the actual proposed stocks β€” feeling the paper in hand is worth more than any specification sheet. We keep sample books of our standard stocks and are happy to advise on the trade-offs for your specific project and destination market.

Get a Printing Quote

← Back to Blog