If you’re planning to print flyers, business cards, brochures or postcards, you’ve probably come across the term “GSM” and wondered what it actually means. You may also hear printers refer to microns (µm), which measure the actual thickness of paper, whereas GSM measures weight. Choosing the right GSM may make or break your project!
With over 50 years in the print industry, the team at Gemini Print Solutions has tested every paper weight imaginable, and we’re here to help you figure out which GSM is right for your project.
This guide explains GSM clearly, how it relates to micron thickness, and helps you choose the best paper weight based on what you’re printing and the impression you want to make.
GSM stands for grams per square metre and refers to the weight of paper. In simple terms, the higher the GSM, the heavier the paper will feel.
However, actual thickness depends on micron (caliper), not just GSM. Papers with the same GSM can have different thicknesses depending on their density and composition.
For example:
While GSM is a strong indicator of weight and perceived thickness, the true thickness always depends on micron.
GSM influences how printed materials perform, feel, and are perceived, making it a key factor when choosing the right paper.
Durability
Higher GSM papers are generally more durable, but actual rigidity and thickness still depend on micron. Lower GSM stocks are more lightweight and cost-effective, but can crease or tear more easily in high-volume or distributed print.
Print feel and perception
Heavier GSM stocks tend to feel more premium and substantial in the hand. However, the perceived thickness and stiffness will also depend on micron and paper structure. Lighter papers feel more functional and budget-focused.
Application suitability
Different GSM ranges are designed for different uses, from flyers and leaflets through to business cards and packaging. Matching GSM to the purpose, alongside the right micron thickness, ensures the material performs properly without being over- or under-specified.
Overall balance
Choosing the right GSM is about balancing durability, cost, perceived quality, and actual thickness (micron) so the final printed piece works effectively for its intended use.
The table below gives a quick reference guide to the most common paper weights and their typical print uses. Note that thickness within each range can vary depending on micron.
| GSM Range | Best For (Print Use) | Description |
| 70–100gsm | Standard office printing paper | Lightweight everyday paper used for general printing and internal documents |
| 120–170gsm | Flyers and leaflets printing | Cost-effective option for high-volume marketing materials and distribution campaigns |
| 170–250gsm | Premium flyers and menus printing | Heavier stock that feels more durable and high-quality for customer-facing print (thickness varies by micron) |
| 250–350gsm | Postcards and brochure covers | Strong paper used for professional marketing materials and durable printed items |
| 350–450gsm | Business cards printing | Rigid, premium cardstock designed to create a strong first impression |
| 400gsm+ | Luxury packaging and premium cards | Very thick stock used for high-end branding, packaging, and luxury print finishes (actual thickness depends on micron) |
Choosing the right GSM depends on what you’re printing and how you want it to be received. Keep in mind that final thickness and stiffness will depend on micron as well as GSM.
Not always. GSM measures weight, not exact thickness.
Thickness depends on micron (caliper), which can vary even when GSM is the same.
Two papers with the same GSM can feel different depending on:
For instance, a 300gsm uncoated stock may feel bulkier than a 300gsm gloss-coated paper because it has a higher micron thickness.
Not necessarily. Higher GSM can feel more premium, but it doesn’t automatically mean better results.
Quality also depends on:
For example, a well-designed 150gsm leaflet can be far more effective than a heavier piece that doesn’t suit its purpose.
What GSM is standard printer paper?
Standard printer paper is typically 80gsm, with thickness depending on its micron specification.
Is 300gsm thick paper?
Yes, 300gsm is considered thick paper, although the actual thickness depends on micron. It is commonly used for business cards, postcards, and premium marketing materials.
What GSM is best for flyers?
For most flyer printing, 130–170gsm is ideal for cost-effective distribution. If you want a more premium feel, 170–250gsm is a better option, with thickness varying by micron.
What GSM should business cards be?
Business cards are usually printed on 350–450gsm stock depending on how thick and rigid you want them to feel, which is influenced by micron as well as GSM.
Does higher GSM always mean better quality?
No. Higher GSM means heavier paper, but quality also depends on finish, design, suitability, and micron thickness.
Does GSM apply to clothing as well?
Yes. In clothing, GSM refers to fabric weight per square metre. Higher GSM fabrics are generally thicker and warmer.
However, this guide focuses on print materials, where GSM describes paper weight, while micron defines thickness.
GSM is one of the most important factors when choosing paper, but it doesn’t tell the whole story.
For a complete picture, it’s important to consider micron thickness alongside GSM, as this determines how thick and rigid the paper actually feels.
If you’re unsure which paper weight to go for, getting a second opinion can save time and prevent costly mistakes. We’re always happy to recommend the most suitable GSM and micron combination for your project, and we can send samples so you can feel the difference and choose with confidence.
