Journal / Paper guides / Paper Weight for Printing: GSM vs LB and What to Use

Published January 26, 2026 · Updated May 31, 2026 · 8 min readSection / Journal

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Paper Weight for Printing: GSM vs LB and What to Use

Compare GSM and lb paper weights for printable templates. Choose paper for notes, graph paper, duplex worksheets, planners, covers, and ink-heavy pages.

PGPaperGens · writing about print·January 26, 2026·Updated May 31, 2026·8 min read

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For most printable templates, start with 75 to 90 gsm copier paper for everyday pages and move to 90 to 120 gsm when you need duplex printing, heavier ink, or less show-through. Use heavier cardstock only when your printer supports it and the template actually needs stiffness.

Paper weight is not a quality score by itself. A heavier sheet can feel better, reduce show-through, and survive handling, but it can also jam printers, curl in heat, cost more, and make binder packets bulky. The right choice depends on what the page has to do after it prints.

Quick answer

Use case	Practical paper weight
Everyday notes and worksheets	75 to 90 gsm, often sold as 20 lb bond in the US
Duplex classroom packets	90 to 105 gsm if show-through matters
Ink-heavy graph paper or planners	90 to 120 gsm, depending on printer limits
Handwriting practice for children	80 to 100 gsm, with enough opacity for pencil and eraser
Covers, dividers, cards, and inserts	135 gsm and up, only if the printer supports thicker media
Archival or presentation copies	Choose by opacity, finish, and acid-free claims, not weight alone

If you are unsure, print the same template on two or three candidate papers and choose the lightest sheet that survives the real workflow.

GSM vs LB explained

GSM means grams per square meter. It measures paper mass by area, so it is easier to compare across brands, countries, and sheet sizes. ISO 536 defines a method for determining paper and board grammage, expressed in grams per square meter.

LB in US paper packaging usually means basis weight. It is the weight of a standard ream in a paper category's basic uncut size. That means 24 lb bond, 60 lb text, 65 lb cover, and 110 lb index are not directly comparable unless you know the grade.

Label	What it tells you	What can confuse users
GSM	Mass per square meter	Does not describe finish, opacity, stiffness, or printer compatibility
Bond lb	Basis weight for bond paper	Useful for office paper, but not comparable to cover lb
Text lb	Basis weight for text stock	Can sound heavier than bond while feeling similar
Cover lb	Basis weight for cover stock	Often stiffer than text stock with the same number
Index lb	Basis weight for index stock	Common for card-like uses, but still printer-dependent

Use GSM when comparing across product listings. Use lb labels when buying familiar US office paper from the same grade family.

Common paper weight ranges

Approximate range	Typical feel	Good for
70 to 75 gsm	Light copier paper	Drafts, one-sided worksheets, short-lived classroom copies
80 gsm	Everyday office paper	Notes, simple lined pages, low-ink templates
90 to 100 gsm	Slightly heavier	Duplex packets, graph paper, planners, moderate ink coverage
105 to 120 gsm	Noticeably sturdier	Handouts, forms, presentation notes, heavier pens
135 to 170 gsm	Light cardstock feel	Covers, dividers, cards, manual-feed jobs
200 gsm and up	Cardstock	Specialty cards, covers, craft work, usually not for ordinary trays

These bands are practical starting points, not universal rules. Always check your printer's maximum supported media weight before loading thicker stock.

Choose by template type

Different templates stress paper differently.

Template type	What matters most	Suggested starting point
Lined notes	Smooth writing and easy erasing	75 to 90 gsm
Graph paper	Show-through and line contrast	90 gsm if printed double-sided
Dot grid	Subtle marks and low ghosting	80 to 100 gsm
Music staff paper	Clean lines and low bleed	90 to 105 gsm
Primary handwriting paper	Pencil, eraser, and marker tolerance	90 to 100 gsm
Index-card sheets	Clean cuts and stiffness	Use template-specific stock and printer specs
Covers and dividers	Stiffness and handling	135 gsm or heavier if supported

Duplex and show-through

Duplex printing is where paper weight starts to matter. A thin sheet can work well for single-sided notes but become distracting when graph lines, ruled lines, or dark planner elements appear on both sides.

Before choosing a heavier ream, test:

Print the darkest template you expect to use.
Print the same page double-sided.
Hold the page under normal room light.
Write on the page with the actual pen or pencil.
Highlight one section if students or staff will use highlighters.
Check whether the back side distracts from the front.

If show-through is the only problem, move one weight band up or reduce template line darkness. Do not jump straight to cardstock.

Printer limits and tray paths

Paper weight decisions must respect the printer. A sheet that feels perfect in hand may fail in an office printer that only supports ordinary media in the main tray.

Check:

Printer setting or spec	Why it matters
Maximum media weight	Prevents jams, slipping, and feed errors
Manual feed or bypass tray	Often required for heavier stock
Duplex support by weight	Some printers duplex ordinary paper but not cardstock
Laser fuser heat	Can curl lightweight or coated stock
Inkjet drying time	Heavier or coated sheets may need more drying time
Paper grain and curl	Affects folding, feeding, and flatness

When the printer manual gives a weight range, follow it. Repeated jams waste more time and paper than a lighter sheet ever saves.

Pen, pencil, marker, and ink coverage

The best paper weight also depends on the writing tool.

Pencil practice needs paper that erases cleanly without tearing.
Ballpoint notes can usually use ordinary copier paper.
Fountain pens and wet gel pens need more attention to bleed and feathering.
Highlighters can show through on light paper.
Dense graph or dot paper may need more opacity than plain lined paper.
Full-color planner art needs separate testing for ink load and drying.

Paper finish matters here. Two sheets with the same gsm can behave differently if one is smoother, coated, recycled, or more absorbent.

Cost, storage, and binders

Heavier paper is not automatically better for packets. A 60-page workbook on heavier stock can become bulky, expensive, and harder to turn. It also increases shipping weight and storage space.

Use this rule: choose the lightest sheet that keeps the page readable, writable, and durable enough for the job.

For binders, test a real stack. A single 120 gsm sheet may feel excellent, but fifty sheets can make a binder stiff. If students need to carry the packet daily, a moderate 90 gsm sheet may be the better choice.

Test before buying a full ream

Use a small test ladder:

Step	What to do
1	Pick the template with the most ink coverage you expect to print
2	Print it on two or three candidate paper weights
3	Test the actual writing tools
4	Duplex one copy if double-sided output matters
5	Check curl, smearing, show-through, and feed consistency
6	Choose the lightest successful paper

Common mistakes

Treating GSM as a direct quality score.
Comparing 60 lb text to 60 lb cover as if they are the same.
Buying cardstock before checking printer media limits.
Testing only a blank page instead of the darkest real template.
Forgetting to test duplex output.
Ignoring finish, opacity, and ink behavior.
Choosing paper too heavy for a binder packet.

Paper weight should solve a specific problem: ghosting, durability, stiffness, presentation feel, or ink behavior. If you cannot name the problem, ordinary office paper may be enough.

FAQ

Is higher GSM always better? No. Higher GSM usually means more mass per area, but it does not guarantee better writing feel, opacity, finish, or printer compatibility.

Is 20 lb paper the same as 75 gsm? Many common 20 lb bond office papers are around 75 gsm, but always check the packaging because lb labels depend on paper grade.

Why is 60 lb text not the same as 60 lb cover? LB paper weights use different basis sizes by paper category. The same number can mean a different physical sheet feel.

What paper weight should I use for double-sided worksheets? Start around 90 to 105 gsm, then proof with the actual template and writing tools.

Can I print cardstock in a normal printer? Only if the printer supports that media weight and feed path. Use the manual tray when the printer recommends it.

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