GSM vs pounds, made orderable

What GSM actually measures

GSM (grams per square meter) is a standard measurement that represents the weight of one square meter of paper. Unlike pounds, GSM provides a consistent way to compare paper weights across different grades and manufacturers. A 100 GSM paper weighs 100 grams per square meter, regardless of whether it's bond, cover, or text stock.

This measurement is particularly useful for international orders and comparisons because it eliminates the confusion of different basis weight systems used in various countries. GSM correlates directly with paper thickness (caliper) and bulk—higher GSM generally means thicker, more substantial paper.

Why US pounds differ by grade

US paper weight in pounds is based on the weight of 500 sheets of a specific size for each grade. 'Text' or 'bond' paper uses 17×22 inch sheets, while 'cover' paper uses 20×26 inch sheets. This means 80 lb text (based on 17×22 sheets) is not the same as 80 lb cover (based on 20×26 sheets).

The result is that pound measurements are grade-dependent and can be confusing. An 80 lb text paper might be 118 GSM, while an 80 lb cover paper could be 216 GSM—nearly double the weight. This is why GSM has become the preferred international standard for paper weight comparison.

Typical GSM bands and their jobs

Paper weight ranges correspond to common printing applications. Copy paper (74-90 GSM) is lightweight and economical for everyday printing. Letterhead and flyers (100-130 GSM) provide better quality and durability. Premium flyers and covers (150-200 GSM) offer a more substantial feel. Business cards and card stock (250-350 GSM) are thick and rigid.

Each weight range serves specific purposes: lightweight papers for high-volume printing, medium weights for marketing materials, and heavy weights for professional stationery and packaging. The right choice depends on the intended use, printing method, and desired tactile experience.

Thickness vs weight: understanding caliper and bulk

Paper thickness is measured in mils or microns (1 mil = 0.001 inch, 1 micron = 0.000039 inch). While higher GSM generally means thicker paper, the relationship isn't perfectly linear. Coated papers may feel thinner than uncoated papers at the same GSM due to density differences.

Bulk refers to how papers of the same weight feel and perform. Some papers have more 'body' or 'substance' than others at the same GSM. When specifying paper, consider both weight and the desired tactile quality—some papers feel more substantial even at similar weights.

Coatings: matte, gloss and silk in practical terms

Paper coatings affect both appearance and performance. Matte coatings reduce glare and feel smooth without shine. Gloss coatings create high reflectivity and vibrant colors but can show fingerprints. Silk (or satin) coatings offer a middle ground with subtle shine and reduced glare.

Coatings also affect printability. Matte papers may absorb more ink, while gloss papers can produce sharper images. The choice depends on the printing method (offset, digital, inkjet) and the desired final appearance. Always test coatings with your specific printing process.

What to actually ask a printer

When ordering paper, be specific about your requirements. Provide the stock name (if you have a preference), GSM, and finish (matte, gloss, silk). For example: 'Please use 170 GSM gloss coated cover stock for the brochures.'

If you're unsure, ask for samples or consult with your printer. They can recommend appropriate weights and finishes based on your project needs. Remember that paper choice affects not just appearance but also mailing costs, folding, and overall project budget.

• Specify stock name (if you have a preference)
• Provide GSM (grams per square meter)
• Indicate finish (matte, gloss, silk)
• Ask for samples if unsure
• Consider mailing and folding requirements

International orders and the GSM bridge

GSM simplifies international paper ordering because it's a universal measurement. When working with printers in different countries, GSM eliminates confusion from different pound systems. A 120 GSM paper in the US is the same as 120 GSM in Europe or Asia.

For international projects, specify GSM clearly in your requirements. This ensures consistent quality and avoids misunderstandings. Many international printers prefer GSM and may provide equivalent pound measurements for your reference.

Worked conversions: pounds to GSM (approximate)

Conversions between pounds and GSM are approximate and grade-dependent. Common conversions include: 80 lb text ≈ 118 GSM, 80 lb cover ≈ 216 GSM, 100 lb cover ≈ 270 GSM. These conversions work because they account for the different basis sheet sizes used in pound measurements.

For example, 80 lb text paper is based on 500 sheets of 17×22 inch text paper weighing 80 pounds total. Converting to GSM involves calculating the weight per square meter, resulting in approximately 118 GSM. Always verify conversions with your specific paper supplier, as small variations can occur between manufacturers.

Worked ordering decision: business cards vs letterhead

Let's make a concrete decision for two common projects. For business cards, you have two options: 250 GSM (standard) or 350 GSM (premium). The 250 GSM card will feel substantial but still fit in standard wallets, while the 350 GSM card will feel very thick and luxurious but may be too rigid for some uses. For letterhead, 100 GSM is standard office paper, while 120 GSM provides a more professional feel without being too heavy for everyday use.

The choice depends on your brand positioning and customer expectations. A luxury jewelry brand might choose 350 GSM business cards to convey premium quality, while a budget-friendly service business might opt for 250 GSM to keep costs down. For letterhead, a corporate client might prefer 120 GSM for a polished appearance, while a casual café could use 100 GSM for everyday correspondence.

Caliper and bulk explained with 300 GSM examples

Paper thickness is measured in mils or microns (1 mil = 0.001 inch, 1 micron = 0.000039 inch). A 300 GSM coated art paper might have a caliper of 12-15 mils, while a 300 GSM uncoated watercolor paper could be 18-22 mils thick. The difference comes from density—coated papers are more compressed during manufacturing.

Bulk refers to how papers of the same weight feel and perform. A 300 GSM cotton paper will feel more substantial and luxurious than a 300 GSM wood-pulp paper due to fiber composition. When specifying paper, consider both weight and the desired tactile quality—some papers feel more substantial even at similar weights. Test samples to understand the actual feel before committing to a large order.

How coatings change perceived weight and feel

Paper coatings affect both appearance and perceived weight. A matte coating can make paper feel smoother and slightly lighter, while a gloss coating can make the same GSM paper feel heavier and more substantial due to light reflection. Silk coatings provide a middle ground with subtle shine and reduced glare.

Coatings also affect printability. Matte papers may absorb more ink, while gloss papers can produce sharper images but show fingerprints more easily. The choice depends on the printing method (offset, digital, inkjet) and the desired final appearance. Always test coatings with your specific printing process, as different inks and printers interact differently with various finishes.

Cost drivers when ordering paper

Several factors affect paper pricing beyond weight: fiber composition (cotton vs wood pulp), coating type (matte, gloss, silk), environmental certifications (FSC, recycled content), and order volume. A 300 GSM cotton paper with FSC certification will cost significantly more than a 300 GSM standard wood-pulp paper.

Recycled content adds cost but appeals to eco-conscious customers. Specialty finishes like metallic or textured coatings also increase price. When budgeting, consider the total cost including printing, finishing, and mailing. Sometimes a slightly more expensive paper can reduce waste and reprinting costs by performing better in your printing process.

What 'card stock', 'cover', and 'text' mean in print shops

'Text' or 'bond' paper refers to lightweight papers typically used for everyday printing (74-130 GSM). 'Cover' stock is heavier (150-350+ GSM) and used for postcards, brochures, and business cards. 'Card stock' is a general term for heavy papers, often implying rigidity suitable for standalone items like greeting cards or packaging.

In print shops, these terms help specify both weight and intended use. A printer knows that 'cover stock' implies a heavier, more durable paper than 'text stock'. When ordering, be specific about both the weight (GSM) and the stock type to ensure you get the right paper for your project. Some shops may use regional variations of these terms, so confirm understanding with samples if possible.

Recycled paper stocks: benefits and considerations

Recycled papers come in various grades, from 30% post-consumer content to 100% recycled. A 100 GSM recycled paper might feel slightly different from virgin paper due to fiber composition. Recycled papers can have a 'greener' appearance and may perform differently in printing processes.

Benefits include environmental appeal and sometimes unique textures. Considerations include potential for more variation between batches and possible differences in printability. Test recycled options with your specific printing process, as some inks may absorb differently or colors may appear less vibrant compared to virgin papers.