Plastic Film Weight Calculator
Calculate the theoretical weight of plastic film, sheet or roll from length, width, thickness and material density. Supports multiple units, layers, rolls and cost estimation.
Film Parameters
Theoretical Weight
Weight in other units
| Unit | Per roll | Total |
|---|
Common Material Densities
Typical values in g/cm³. Actual density varies with grade, additives and fillers.
| Material | Density | Typical use |
|---|
How to use
- Select a material or type your own density.
- Enter length, width and thickness, and choose the matching units.
- Set the number of layers and rolls if needed.
- Press Calculate to see weight, grammage and optional cost.
Formula and assumptions
Weight (g) = Length (cm) × Width (cm) × Thickness (cm) × Density (g/cm³) × Layers × Rolls.
Grammage (g/m²) = Thickness (μm) × Density (g/cm³) × Layers.
Results are theoretical. Real rolls differ because of thickness tolerance, core weight, and moisture. Flat film is assumed; for lay-flat tubing enter double the flat width.
Frequently Asked Questions
How is the weight of plastic film calculated?
Multiply the film volume (length × width × thickness) by the material density. For example, 1,000 m × 0.5 m × 50 μm of LDPE (0.92 g/cm³) weighs about 23 kg.
How do I convert thickness from microns to mil or gauge?
1 mil equals 0.001 inch or 25.4 μm. 1 c (also called gauge or wire in some markets) equals 0.01 mm, or 10 μm. Choose the matching unit in the thickness drop-down and the calculator converts it for you.
Why is the real roll heavier or lighter than the calculated weight?
The result is a theoretical net film weight. Actual rolls vary because of thickness tolerance (often ±5% to ±10%), the weight of the paper or plastic core, packaging, and moisture absorption in materials such as nylon.
Does the calculation include the core?
No. The result is the weight of the film only. Add the core weight separately if you need the gross weight of a roll, for example when planning shipping.
How do I calculate lay-flat tubing or gusseted bags?
For lay-flat tubing, enter double the flat width, because both walls of the tube are film. For gusseted film, add the gusset folds to the width. You can also use the layers field for multi-ply products.
Which density should I use for my material?
Pick the material from the list to fill in a typical density. If your film contains fillers, masterbatch or co-extruded layers, check the supplier datasheet and type the exact density into the density field.
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