Paper Weight Calculator

About the Paper Weight Calculator

The Paper Weight Calculator converts between all major paper weight systems used in North America and internationally. The US paper industry uses multiple confusing weight scales — bond, text, cover, index, tag, and Bristol — where the same pound number means vastly different thicknesses depending on the category. This calculator eliminates that confusion.

Enter a weight in any system and review the equivalents in all others, plus the universal GSM (grams per square meter) standard. The calculator also calculates the physical weight of your paper order based on sheet size and quantity, helping you estimate shipping costs and handling requirements for print jobs.

Designers, print buyers, and paper specifiers rely on accurate weight conversions to ensure consistency when collaborating with international suppliers, comparing quotes from different vendors, or matching an existing printed piece. This calculator uses the official TAPPI conversion factors used by paper mills and merchants worldwide.

When This Page Helps

Paper weight conversion is one of the most confusing parts of print production because the US basis-weight labels are not directly comparable across paper categories. This calculator puts the major US systems and GSM in one place.

It is useful because it also connects weight labels to actual order weight and shipping impact. That makes it practical for printers, designers, and buyers, not just as a static conversion table.

How to Use the Inputs

1. Select the weight system you're converting from (bond, text, cover, etc.)
2. Enter the paper weight value
3. View conversions to the other weight systems and GSM values
4. Enter sheet dimensions and quantity to calculate total weight
5. Review common paper grades in the reference table
6. Use presets for frequently specified paper weights
7. Add shipping weight for ream or carton estimates

Example Calculation

Tips & Best Practices

• When in doubt, use GSM — it's the only truly universal paper weight measurement
• Remember: 80 lb text and 80 lb cover are NOT the same paper — cover is much thicker
• For international orders, always specify GSM to avoid confusion with US basis weights
• Paper merchants can provide "swatch books" with sample chips of every weight — request one
• Heavier paper doesn't always mean better — match the weight to the application

Understanding US Paper Weight Systems

The US paper weight system dates back centuries and is based on a now-archaic measurement method. Each paper category has a "basis size" — the standard sheet size for that category. The weight in pounds refers to the weight of 500 sheets (one ream) at that basis size. Because basis sizes differ between categories (17×22" for bond, 25×38" for text, 20×26" for cover), the same pound number represents different actual weights.

GSM: The Universal Standard

The metric GSM system simply measures grams per square meter, making it consistent across all paper types. A sheet of 120 GSM paper weighs 120 grams per square meter whether it's labeled as bond, text, cover, or anything else. This simplicity is why GSM is the international standard and why US printers increasingly specify paper in GSM.

Practical Paper Selection Guide

For office printing, 75-90 GSM (20-24 lb bond) works for most needs. Marketing materials typically use 130-170 GSM (90-100 lb text) coated stock. Direct mail postcards require 250-300 GSM (92-110 lb cover) to meet USPS thickness requirements. Choosing the right weight balances print quality, mailing costs, and the perceived value of the finished piece.

Frequently Asked Questions

• Why does the US have so many paper weight systems?

  Each weight system uses a different basis sheet size. Bond uses 17×22", text/offset uses 25×38", and cover uses 20×26". The pound weight is based on 500 sheets at that specific size, so numbers don't compare across categories.

• What is GSM and why is it better?

  GSM (grams per square meter) measures weight per unit area regardless of sheet size, making it universally comparable. A 100 GSM paper is 100 GSM whether it's bond, text, or cover — the weight doesn't change with the label.

• What's a typical business card weight?

  Business cards are typically 80-100 lb cover (216-270 GSM) for standard cards, or 110-130 lb cover (300-350 GSM) for premium thick cards. The thicker stock feels more substantial in the hand and resists bending better.

• How heavy is a ream of copy paper?

  A standard ream (500 sheets) of 20 lb bond letter-size paper weighs about 5 pounds. A case of 10 reams weighs approximately 50 pounds. That is useful when estimating shipping or storage needs.

• What's the difference between text and cover weight?

  Text weight papers are thinner, used for book pages, letterhead, and flyers. Cover weight papers are thicker, used for business cards, postcards, and book covers. 100 lb text ≈ 37 lb cover. The label changes with the basis size, so the same pound number does not mean the same thickness.

• How do I match a paper sample I already have?

  Measure the paper's thickness with a micrometer (in mils/points) and compare it to the thickness ranges in our reference table. Also note whether it's coated or uncoated. Matching both thickness and finish usually gets you much closer than guessing from weight alone.