If you’ve ever tried to buy cardstock and thought, “Cool, so what does 80 lb actually mean?” you’re not alone.
Cardstock paper weight is confusing because the numbers aren’t all describing the same thing. Some describe weight, some describe thickness, and some depend on the category of paper being measured. That’s why one “80 lb” stock can feel totally different than another “80 lb” stock.
This guide makes it simple so you can choose paper that feels right for invitations, business cards, and stationery.
The three systems you’ll see: GSM, lb, and pt
You’ll run into three common ways to describe paper:
1) GSM (grams per square meter)
GSM is the most straightforward because it’s consistent across paper types. Higher GSM generally means heavier, thicker paper (though texture and coatings can change feel too).
If you want one number system to trust, GSM is usually it.
2) Pounds (lb) / basis weight
This is where confusion starts. “80 lb” doesn’t mean the same thing across all paper, because the pound system depends on paper category (bond vs text vs cover, etc.). That’s why it’s possible to compare two “80 lb” papers and have them feel like different products.
If you’re shopping by pounds, always check the category: 80 lb text is not the same as 80 lb cover.
3) Points (pt)
Points are closer to what people think they’re buying when they say “thick cardstock.” Pt is a thickness measurement, which is why it’s commonly used for business cards (14pt, 16pt, 18pt, 32pt, and so on).
If you care most about stiffness, pt is the most direct signal.
So what should you use when you’re ordering?
Here’s the practical approach:
- If you want a simple comparison across lots of paper options: use GSM.
- If you’re ordering business cards and want a “feel” expectation: use pt.
- If a shop lists only pounds: make sure you know whether it’s text or cover.
In other words, don’t treat “lb” as universal. It isn’t.
Quick picks: what cardstock weight fits each product
These aren’t strict rules. They’re sane starting points.
Invitations (the “kept on a fridge” product)
For invitation cardstock, people usually want something that feels sturdy but still mails well and doesn’t crack when handled.
- For simple flat invites: medium-to-heavier cardstock often feels best
- For folded pieces: don’t go so thick that folding becomes a battle
If you’re doing a folded invitation or a folded thank you card, think about scoring (a crease made before folding). Scoring helps prevent cracking, especially on thicker or coated stock.
Business cards (the “don’t bend in a pocket” requirement)
For business cards, thickness matters because the card gets handled more roughly.
- Standard: feels solid and familiar
- Premium: a bit thicker for rigidity
- Ultra-thick: a statement, not a requirement
Also: darker designs on soft-touch or coated stocks can show scratches more easily. So if you’re going for “black-on-black minimalist,” test first.
Postcards and announcement cards
Postcards and announcements benefit from sturdiness, but they also get mailed, so weight matters for postage. If you’re mailing at scale, ask about weight and postal constraints before you go maximum thickness.
Thank you cards and stationery
Writeability matters here. Uncoated stocks are often easier to write on. Heavy coatings can cause ink to smear depending on the pen.
Coated vs uncoated: how it changes color and feel
This choice affects how your printed piece behaves in real life.
Coated stocks
- colors can look more saturated
- surfaces can be smoother
- fingerprints and scuffs can show more (depends on coating)
Uncoated stocks
- softer, more natural feel
- easier to write on
- colors can appear slightly muted, but often in a nice way
Neither is “better.” Coated is punchier. Uncoated is calmer.
The simplest way to avoid paper regret: sample first, then decide
Screens don’t tell you what paper feels like. Product photos can’t either. If you’re printing something important (wedding invites, brand cards, client stationery), the best move is to order samples and do a basic test:
- hold it under normal light
- read small text
- see how it feels next to a “normal” card you already like
- if it folds, fold it (or score it) and check for cracking
Two minutes of testing can save you from ordering 200 pieces you don’t love.
Conclusion
Cardstock paper weight gets easier once you stop expecting one number system to explain everything.
- GSM is the most consistent way to compare paper.
- lb depends on the paper category, so it can be misleading without context.
- pt is the most direct signal for thickness, especially for business cards.
Choose based on the job: invitations need feel and mailability, business cards need durability, and stationery needs writeability. And when in doubt, sample first.