Enter the film width, thickness and roll length to get the net film weight and the gross roll weight with core. Or switch to “Check length by weighing”: weigh a roll, enter the core weight, and see how many metres of film it really holds. Works in metric and imperial units.
Gauge here is true gauge: 100 ga = 1 mil = 25.4 µm, so 80 ga ≈ 20 µm.
Typical: hand rolls 0.3–0.7 kg, machine rolls 1–1.5 kg. Weigh an empty core for the best result.
Film density
0.92 is the usual value for LLDPE stretch film. Change it only if your supplier gives a different figure.
Net film weight
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- Gross roll weight (with core)
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- Film area
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- Film length per kg
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Estimated roll length
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- Net film weight
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- Film length per kg
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Reference values calculated from nominal dimensions. Real rolls vary with thickness tolerance and core weight.
Need rolls in this size?
Get a quote for the roll you just calculated
Tell us the width, thickness and roll length, and we will quote by specification and net film weight. Samples are free; you pay the shipping, and that cost is deducted from your first bulk order.
How is stretch film roll weight calculated?
Net film weight (kg) = width (m) × thickness (µm) × length (m) × density (g/cm³) ÷ 1,000
Stretch film is made from LLDPE with a density of about 0.92 g/cm³. Gross roll weight is the net film weight plus the weight of the core.
Example: a 500 mm × 23 µm × 1,500 m machine roll holds 0.5 × 23 × 1,500 × 0.92 ÷ 1,000 = 15.87 kg of film (35.0 lb). With a 1 kg core, the roll weighs 16.87 kg.
How can I check whether a roll has its full length?
Weigh the roll, subtract the core weight, and divide by the film weight per metre. For example, a 500 mm × 23 µm roll carries 94.5 m of film per kg. If a roll labelled 1,500 m weighs 16.2 kg on a 1 kg core, the net film weight is 15.2 kg, which is only about 1,437 m of film.
This is the same method our factory uses for net weight: we spot-check the core weight of each batch before production, weigh finished rolls, and subtract the core.
What is true gauge?
True gauge is the real measured thickness: 100 gauge = 1 mil = 25.4 µm, so 80 gauge is about 20 µm. Some film in the US market is sold by “equivalent” or “performance” gauge, where a thinner film carries a higher gauge label. If you compare rolls labelled by equivalent gauge, the calculated weight will be higher than the real roll. Comparing net film weight is the most reliable check. Tuosheng Packaging labels film by true gauge.
How much does a stretch film core weigh?
It depends on the core size and wall thickness. Hand roll cores usually weigh 0.3, 0.5 or 0.7 kg, and machine roll cores usually weigh 1 or 1.5 kg. For an accurate check, weigh an empty core from the same batch.
Need standard hand or machine rolls?
See our hand stretch film and machine stretch film pages for standard sizes, or read the Stretch Wrap Sizes guide for EU and US roll charts.
