Journal / Paper guides / Paper Weight for Printing: GSM vs LB (and What to Use)
Published 2026-01-26 · 7 min readSection / Journal
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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 feel | Good for |
|---|---|---|
| 70–80 gsm | Everyday copier | Draft worksheets, single-sided notes |
| 90–120 gsm | Heavier letterhead | Double-sided STEM packets, ink-heavy charts |
| 135+ gsm | Card-like | Covers, 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.
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