Laminate Structure Weight Calculator
Enter the thickness and density of each layer (PET, AL, PE and more) to get the total grammage (GSM), theoretical thickness, average density and roll weight of your laminated film.
Quick structure presets
Load a typical structure, then edit any value to match your specification.
Layer structure
Layers are listed from outer to inner. Thickness in micrometers (µm), density in g/cm³. Pick a material to auto-fill a typical density.
Roll and order settings
Calculation results
| Layer | Thickness µm | Density | GSM | Weight % |
|---|---|---|---|---|
| Total | - | - | - | 100% |
Order weight estimate
How it works
Formulas and assumptions
- Layer GSM (g/m²) = thickness (µm) × density (g/cm³).
- Total GSM = sum of all layer GSM values.
- Theoretical thickness = sum of layer thicknesses; average density = total GSM ÷ total thickness.
- Film length = area ÷ width; weight with waste = net weight × (1 + waste %). Real films vary by tolerance and coating.
How to use
- Choose a preset or add your own layers from outer to inner.
- Enter thickness in µm and density in g/cm³ for each layer.
- Read total GSM, thickness and the weight share of each layer.
- Enter area and roll width to estimate order weight and length.
Typical material densities
| Material | Density g/cm³ | Typical use |
|---|---|---|
| PET | 1.39 | Printable outer layer, strength |
| BOPP | 0.91 | Printable outer layer, low cost |
| PA (Nylon) | 1.14 | Puncture resistance, retort |
| Aluminum foil | 2.70 | Light, oxygen and moisture barrier |
| PE | 0.92 | Heat-seal inner layer |
| CPP | 0.90 | Heat-seal layer for retort and hot fill |
| Adhesive (dry) | 1.10 | Bonding between layers, about 2 to 4 g/m² |
Frequently asked questions
How is the GSM of a laminated film calculated?
Multiply each layer's thickness in micrometers by its density in g/cm³ to get grams per square meter, then add all layers together.
Should I include adhesive layers?
Yes for the most accurate weight. A dry adhesive layer is usually 2 to 4 g/m² and can be added as a layer with density about 1.1. Use the option to exclude it for a quick estimate.
Why is the theoretical thickness different from measured thickness?
Real films have thickness tolerances, coating and ink layers, and slight air gaps. Measured values usually differ by a few percent.
What density should I use for aluminum foil?
Use about 2.70 g/cm³. A 7 µm foil is roughly 18.9 g/m². For metallized film (VMPET) the metal layer is extremely thin, so use the base film density.
How do I convert GSM to weight per roll?
Roll weight (kg) = GSM × width (m) × length (m) ÷ 1000. This tool does it for you from the total area and roll width, with an optional waste allowance.
Can I use this for custom materials?
Yes. Choose Custom for any layer and type your own thickness and density from the supplier datasheet.
Need a custom laminate structure?
Send us your barrier, strength and sealing requirements and our team will recommend a structure and quote.