Calculators & Tools
Paper Roll Weight Calculator
Estimate the weight of a paper roll from its width, outside diameter, core size, and grade — for freight planning, handling equipment, and machine limits.
Estimates are for planning only. Actual roll weight varies with caliper, moisture content, and winding tension — weigh rolls where the number is critical, and confirm freight weights with your carrier.
Roll weight is the number that freight, handling, and machine planning all run on: carriers price from it, forklifts and roll clamps are rated against it, and unwind stands have a maximum roll weight of their own. You rarely need it to the pound — you need a dependable estimate before the roll is on a scale. That is what this calculator provides.
How Roll Weight Is Calculated
The estimate uses the standard converting-industry formula:
weight (lb) = width (in) × (OD² − core OD²) × factor
The geometry does most of the work. A roll is a cylinder of paper with a cylinder of core missing from its middle, so the cross-section of actual paper is proportional to the outside diameter squared minus the core’s outside diameter squared. Multiply by the width and you have the volume of paper on the roll; multiply by the roll weight factor— the grade’s typical wound density, folded together with the geometry constants — and you have its weight.
Worked example: a 24″ wide roll of kraft at 40″ OD on a core with a 3.5″ outside diameter comes to 24 × (1600 − 12.25) × 0.021 ≈ 800 lb.
Note that the formula wants the core’s outside diameter — where the paper actually starts — not the 3″ or 6″ inside diameter cores are named by. A core’s wall adds roughly half an inch across, and our guide to the anatomy of a paper roll walks through the ID/OD distinction in detail.
Typical Roll Weight Factors
Factors vary by grade family because denser sheets pack more weight into the same wound volume. Common published values:
- Kraft — 0.021
- Newsprint — 0.018
- Uncoated book / free sheet — 0.026
- Coated book — 0.032
These are typical figures, not properties of any specific product. When the number matters, compute your grade’s exact factor from its spec sheet or weigh a roll of known dimensions and solve the formula backwards.
Net vs. As-Shipped Weight
The calculator returns paper-only (net) weight. The as-shipped (gross) weight adds the core, wrapping, and — once palletized — the pallet itself, and gross is what your carrier bills against. Measuring the inputs accurately matters just as much: take width, OD, and core OD the way our roll-measurement guide describes, and state clearly whether any weight you pass along is net or gross.
Frequently Asked Questions
Common Questions
How accurate is a calculated roll weight?
It is a planning estimate. The roll weight factor represents a typical wound density for the grade, but actual density varies with caliper, moisture content, and how tightly the roll was wound. For freight quotes, load limits, and anything safety-related, confirm with a scale weight.
What roll weight factor should I use?
Start with the typical factor for your grade family — the calculator lists common published values. For an exact figure, use the factor from your paper’s spec sheet, ask the mill or supplier, or weigh a roll of known dimensions and work the formula backwards.
Can I use this calculator for materials other than paper?
The formula works for any material wound on a roll if you know its roll weight factor, since the factor is just the wound density expressed for this equation. The preset factors, however, are paper grades — for films, foils, or nonwovens, enter a custom factor from the material’s supplier.
Keep Reading
Related Articles
Converting Basics
Anatomy of a Paper Roll
Every part of an industrial paper roll, explained: parent rolls, cores, width, outside diameter, basis weight, wind direction, and why each measurement matters.
Roll Specifications
How to Measure a Paper Roll
A practical guide to measuring paper rolls: width, outside diameter, core inside diameter, and weight — plus the measuring mistakes that derail converting quotes.
Need It Converted, Not Just Calculated?
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