Paper Reel Formulas - Weight and Length Calculator

Easily calculate the weight or length of your paper reels using simple, industry-standard formulas. Whether you’re working in packaging, printing, or converting, this calculator helps you quickly estimate reel specs based on GSM, diameter, or sheet length—without the guesswork.

Reel Length from Weight

How this works
Formula: (Weight × 1000) / (GSM × Width)

Reel Weight from Diameter

How this works
Formula: ((D² - d²) × π × Width ÷ 4) × Density

Reel Weight from Sheet Length

How this works
Formula: (Length × Width × GSM) / 1000

Download Our Paper Product Catalogue

Explore DS Smith’s full range of sustainable paper products, including grades, specifications, and sustainability credentials — all in one convenient download.

Download Now

PDF 2.1 MB

FAQ Section

It depends on the GSM, width, and weight of the paper. Use our calculator above to get an accurate measurement based on your specifications.

 

Use the formula: Weight = (Length × Width × GSM) / 1000. Alternatively, input your values into our calculator for a quick result.

If you know the reel diameter, core diameter, and width, use: Weight = ((D² - d²) × π × Width ÷ 4) × Density. This is also available as a calculator above.

Reel widths usually range from 1.2 to 2.5 metres, but they can vary depending on the specific machine and end use.

Yes! These calculators and formulas apply to all grades of paper used in printing, converting, and corrugated packaging.

 

GSM (grams per square metre) varies by application. Most packaging papers range between 80 and 300 GSM, but always check specific requirements for your intended use.

 

Yes, these calculators work for all paper grades — including kraft paper, linerboard, and other materials commonly used in packaging and converting.