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Published 2026-01-26 · 7 min read
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Paper guide

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

GSM measures grams per square meter—linear across brands. US “lb bond” ratings describe stack weights and need context. Match weight to ink load and duplex needs.

PGPaperGens · writing about print·2026-01-26·7 min read
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GSM (grams per square meter) describes how much a standardized paper swatch weighs—helpful because it travels across countries without ambiguous “pound” shorthand.
Traditional US bond basis weights (20 lb bond, 24 lb bond, etc.) remain common on retail reams but do not translate linearly to GSM without knowing which paper grade someone means—always cross-check packaging tables.

Practical bands for printable templates

GSM band (approx.)Typical feelGood for
70–80 gsmEveryday copierDraft worksheets, single-sided notes
90–120 gsmHeavier letterheadDouble-sided STEM packets, ink-heavy charts
135+ gsmCard-likeCovers, greeting inserts, some manual-feed cards
Exact jam thresholds depend on printer specs—never exceed vendor max gsm without testing.

Shopping tips

  • Compare same finish (matte vs satin) when weighing competing reams.
  • Watch opacity claims when printing duplex—gsm alone does not guarantee minimal show-through.

Calibrating for your exact printer

Run a weight ladder on your most common job: print the same grid or form on 75, 90, and 105 gsm candidates, then duplex the page. Note which weight shows the least bleed-through for your typical ink/toner coverage. High-heat fusers can curl lightweight stock; conversely, borderline-thick paper may need the bypass tray to avoid misaligned duplex.

Archival, art, and presentation edge cases

Scrapbook and display work may need buffered or acid-free stock not implied by gsm numbers. For student science fair boards, pair weight with coating (matte vs glossy) so spray adhesive does not wrinkle the face.

Environmental and budget trade-offs

Heavier reams cost more and increase shipping mass, but they also reduce reprints when show-through confuses learners. Centralise purchasing so teachers do not improvise with off-brand paper that jams shared copiers.

Humidity seasons and retesting

Re-run your duplex ladder after HVAC shifts—spring humidity can curl yesterday’s perfect gsm pick into today’s jam vector. Warehouse pallets arriving mid-semester deserve quick proof prints even when labels match prior orders.

FAQ

Is 20 lb bond the same everywhere? Not quite—bond basis weight tables differ from text or index ratings; read the icon on the ream.
Can I trust online gsm converters? Use them as a first pass, then physically test on your device.

Related resources

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papergens.com
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Abstand7.1 mm
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On this page

  1. Practical bands for printable templates
  2. Shopping tips
  3. Calibrating for your exact printer
  4. Archival, art, and presentation edge cases
  5. Environmental and budget trade-offs
  6. Humidity seasons and retesting
  7. FAQ

Templates in this guide

  1. 01US College-Linien (7.1mm)7.1 mm
  2. 02Millimeterpapier 1/4 Zoll6.35 mm
  3. 03Dot Grid 5mm5 mm

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