Understanding Paper Weights: A Complete GSM Guide

What is GSM?

GSM stands for Grams per Square Metre.

It measures how much one square metre of paper weighs. In simple terms:

• The higher the GSM, the thicker and heavier the paper.
• The lower the GSM, the thinner and lighter the paper.

For example:

• 80gsm = standard office paper
• 300gsm = sturdy card stock

Why Does GSM Matter?

Choosing the right GSM ensures your print project looks professional, feels right in the hand, and lasts as long as it needs to. Here’s why it matters:

• Appearance: Heavier paper looks premium and more substantial.
• Durability: Thicker stock resists tearing, creasing, or showing through.
• Purpose: Different projects need different strengths—think of the difference between a poster and a business card.

Common GSM Ranges and Their Uses

Here’s a quick reference:

• 35–55gsm
• Very thin, lightweight papers (e.g. newspapers).
• 70–90gsm
• Standard office/photocopy paper, letters, everyday printing.
• 100–120gsm
• Higher quality stationery, letterheads, or flyers.
• 130–170gsm
• Posters, quality brochures, magazine pages.
• 200–300gsm
• Premium leaflets, covers, presentation cards.
• 300–400gsm
• Business cards, postcards, packaging, invitations.

GSM vs Thickness

A common mistake is thinking GSM and thickness are the same. While they’re related, they’re not identical. Different paper types (like coated, uncoated, recycled, or textured) may feel thicker or thinner even at the same GSM. For example, a 300gsm glossy flyer feels different to a 300gsm textured card.

Coated vs Uncoated Papers

• Coated paper (gloss, silk, matte): Feels smoother and often used for leaflets, magazines, or posters.
• Uncoated paper: More natural feel, often used for stationery, books, or eco-friendly printing.

Choosing the Right Paper Weight

When in doubt, match the GSM to your project:

• Everyday office use → 80gsm
• Flyers or handouts → 130–150gsm
• Posters → 170–200gsm
• Brochures with covers → 250–300gsm
• Business cards or invitations → 300–400gsm

Final Thoughts

Understanding GSM takes the guesswork out of printing. The right paper weight makes all the difference in presentation, durability, and overall feel. Next time you’re planning a print project, think carefully about GSM—it’s the backbone of a professional finish.