Paper Weight Explained chart comparing GSM vs. Lbs and coated vs. uncoated, with a conversion section showing Text and Cover examples.

Paper Weight Explained: GSM vs. Lbs, Coated vs. Uncoated, & Conversion Chart

Choosing the right paper for a print project can be confusing. If you are comparing quotes for corporate brochures, direct mailers, or premium catalogs, you have likely encountered terms like GSM, Lbs, Pt, Coated, Uncoated, Text, and Cover.

Using the wrong paper can lead to higher mailing costs, a flimsy brand presentation, or production delays. At Digital City Printing, a premier B2B commercial print production facility with locations in Midtown Manhattan and Long Island City, our employee-driven team guides corporate clients through these technical decisions daily. We ensure high-end results by pairing the exact right stock with our advanced HP Indigo 15000 presses.

To help you make the best choice, we have created this complete guide answering the most searched questions about paper weights, finishes, and types.

Paper Weight Explained: Understanding GSM, Lbs, and Pt

The biggest challenge in commercial printing is understanding the three main measurement systems used to describe paper weight and thickness.

What is GSM Paper? (Grams per Square Meter)

GSM stands for Grams per Square Meter. It is the international standard and the most accurate way to measure paper weight. It simply measures how much one square meter of a specific paper weighs.

  • Why it matters: GSM is universal. A 300 GSM paper will always be thicker and heavier than a 150 GSM paper, making it the easiest metric for comparing stocks.

What Does “Lbs” Mean in Paper Weight? (Basis Weight)

In the United States, paper is measured in Pounds (lbs) or Basis Weight. This measures the weight of 500 sheets (a ream) of a specific paper cut to its standard raw size.

  • The Problem with Lbs: The standard “raw size” changes depending on the category of paper (Text vs. Cover). This means an 80 lb Text sheet and an 80 lb Cover sheet have entirely different weights and thicknesses, which often causes confusion.

What is “Pt” in Paper Thickness? (Caliper/Points)

While GSM and Lbs measure weight, Pt (Points) measures actual thickness. One point is equal to 0.001 inches.

  • When to use it: You will see Pt used for rigid cardstocks, such as 14pt or 16pt business cards, presentation folders, and packaging. For context, meeting minimum USPS commercial mailing requirements for postcards requires a specific point thickness (at least 0.007 inches, or 7pt) to withstand sorting machines.

Text vs. Cover Paper: What is the Difference?

When you buy paper measured in pounds (lbs), it will always include a category name. Understanding these two main categories is crucial.

  • Text Paper (or Book/Offset): This is flexible, standard-weight paper. It easily bends and folds. Best used for: The inside pages of catalogs, corporate brochures, letterheads, and standard flyers.

  • Cover Paper (Cardstock): This is heavy, rigid paper that does not bend easily. Best used for: Catalog and booklet covers, business cards, postcards, and pocket folders.

Crucial Rule: An 80 lb Cover stock is significantly heavier and thicker than an 80 lb Text stock. Always check the GSM if you are unsure!

Coated vs. Uncoated Paper: Which Should You Choose?

The finish of the paper changes both the look of the ink and the tactile feel of the product.

Coated Paper (Gloss, Silk, or Matte)

Coated paper has a surface sealant (typically clay) that prevents ink from soaking into the fibers. The ink sits on top, resulting in sharp, vibrant, and highly saturated images.

  • Gloss: Highly reflective; ideal for photography and vibrant marketing collateral.

  • Silk/Matte: Smooth and non-reflective; provides a highly elegant, premium look for corporate materials without the glare of gloss.

  • Best for: High-end lookbooks, corporate brochures, and image-heavy catalogs.

Uncoated Paper (Offset)

Uncoated paper has no sealant, allowing the ink to absorb directly into the paper fibers. It feels slightly textured to the touch and produces softer, more muted colors.

  • Best for: Corporate stationery, letterheads, workbooks, and minimalist luxury designs. Uncoated paper is also the best choice if the material needs to be written on, as coated paper will cause pen ink to smudge.

Paper Weight Conversion Chart: Lbs to GSM to Pt

Use this chart to easily convert U.S. Basis Weights to GSM and compare their average thicknesses.

U.S. Paper Category & Weight GSM (Approx.) Thickness (Pt) Best For (Common Print Projects)
20 lb Bond / 50 lb Text 75 GSM 3.5 – 4.0 pt Standard copy paper, internal forms.
60 lb Text / 24 lb Bond 90 GSM 4.0 – 4.8 pt Letterheads, workbook pages.
80 lb Text 120 GSM 3.5 – 4.0 pt Standard brochure pages, catalog interiors.
100 lb Text 150 GSM 4.5 – 5.5 pt Premium flyers, high-end booklet interiors.
80 lb Cover 216 GSM 8.0 – 9.5 pt Paperback book covers, thick mailers.
100 lb Cover 270 GSM 10.0 – 11.0 pt Premium booklet covers, light postcards.
14 pt / 120 lb Cover 310 – 320 GSM 14.0 pt Standard business cards, rack cards.
16 pt / 130 lb Cover 350 GSM 16.0 pt Premium business cards, pocket folders.

High Search Intent FAQs: Choosing the Right Paper

What paper weight is best for business cards?

For a professional, sturdy feel, business cards should be printed on 14pt (approx. 310 GSM) or 16pt (350 GSM) cardstock. Anything thinner than 14pt will feel flimsy and cheap.

What is the difference between 80 lb Text and 80 lb Cover?

80 lb Text (approx. 120 GSM) is thin and flexible, similar to a high-quality magazine page. 80 lb Cover (approx. 216 GSM) is a heavy, stiff cardstock used for covers and postcards.

What paper weight should I use for a brochure?

The industry standard for a high-quality corporate brochure is 100 lb Text for the pages, often with a Gloss or Silk coating. If it is a multi-page booklet, pairing a 100 lb Text interior with a heavier 80 lb Cover for the outside provides excellent durability.

How does paper choice impact my production timeline?

Choosing the right stock ensures a smooth run on our HP Indigo presses. To guarantee the highest quality output, premium commercial products—including catalogs, calendars, and stickers—require dedicated production time. These products operate on a standard 3 to 5 business day schedule, as same-day turnaround is not available for items requiring intricate binding, specialized media, or HP Indigo quality.

Ready to start your next B2B print project?

Our team at Digital City Printing specializes in high-end commercial runs, corporate accounts, and premium finishing. As a dedicated B2B production facility, please note we do not offer standard retail walk-in services or single-copy printing. Reach out to our employee specialists today to discuss the perfect paper specs for your next professional campaign.

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