When we talk about paper thickness, we focus on two complementary measurements:
Grammage (gsm) – grams per square meter.
This is the basis weight. It tells you how much a sheet weighs per square meter. Higher gsm generally means a heavier, often thicker sheet, but density varies by pulp type.
Caliper (thickness) – measured in mm or points (1 point = 0.001 inch; often in Europe we use microns or mm).
This is the actual physical thickness under a specified pressure. Two papers with the same gsm can have different calipers-one can be "bulky" (high caliper) and the other "dense" (low caliper).
How Thickness Affects Paper Quality?
Thickness influences several critical quality aspects:
Stiffness & Feel – Thicker paper feels more substantial and premium. It resists bending, which is essential for covers, business cards, and packaging.
Show-through – In double-sided printing, thicker paper (with proper opacity) prevents ink from showing on the opposite side.
Opacity – Thicker sheets block light better, making them ideal for envelopes, books, and packaging where privacy or high-end appearance matters.
Convertibility – Thicker stocks are better for embossing, foil stamping, and die-cutting, while thinner papers excel at folding and high-speed digital printing.
Recommended Thickness by Application
Here's a practical guide based on grammage and typical caliper:
Lightweight (60–120 gsm) – Flexible & economical
Caliper range: approx. 0.06–0.12 mm
Uses:
60–80 gsm: Office copy paper, internal documents, forms, book interiors (text weight). Ideal for high-volume text printing.
100–120 gsm: Magazines, premium letterheads, lightweight brochures. Better opacity for double-sided printing.
Mid-weight (120–200 gsm) – The workhorse for interiors
Caliper range: approx. 0.12–0.20 mm
Uses:
Company brochures, catalog pages, report covers, and high-end magazine inserts.
Offers good stiffness while still being easy to fold.
Heavyweight (200–300 gsm) – Covers & single-sheet items
Caliper range: approx. 0.20–0.35 mm
Uses:
200–250 gsm: Brochure covers, flyers, posters, postcards, greeting cards. Sturdy enough for mailing.
250–300 gsm: Premium business cards, invitations, hang tags, hardcover book covers. Excellent for embossing and foil stamping.
Cardboard & Board (300+ gsm) – Structural & packaging
Caliper range: 0.35 mm and above
Uses:
Shopping bags, rigid boxes, presentation folders, archival mounting boards, and luxury packaging.
Usually scored or creased for folding; provides structural strength.
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