Micron to GSM Calculator
Estimate film basis weight from thickness in microns and density in grams per cubic centimetre. Use a material-library density as a starting point, then replace it with a supplier value when available.
Use a saved product specification (optional)
Enter your values
First time using this calculator?
Replace the example values with figures from your supplier sheet or measurements. Choose the unit beside each value. Results update as you type; fix any highlighted field before using the result.
GSM means grams per square metre. Net weight excludes the core and other packaging. MOQ means the minimum order quantity. An optional field can stay blank unless the result you need depends on it.
Prices keep the selected currency; changing its label does not convert an exchange rate. Save or export the result after checking your inputs.
Help with film thickness
Use the measured or specified material thickness. One micron (µm) is one thousandth of a millimetre.
Typical density. Actual density varies by resin grade and formulation; use supplier or measured data when available.
Help with material density
Density is material mass per unit volume. A typical preset is suitable for an early estimate; use the supplier grade value for purchasing decisions.
Estimated film GSM
Estimated using typical PET / BOPET density of 1.39 g/cm³. Actual density varies by resin grade and formulation.
For a laminate, calculate each material layer separately. Do not use a generic density for paper.
GSM = thickness (µm) × density (g/cm³)
12 × 1.39 = 16.68 g/m²Saved calculations stay in this browser. No account or cloud backup is created.
Save to a product project (optional)
Choose or create a saved product project ↗This is an illustrative example. Saved or transferred values must be checked against your job.
Calculated from your inputs. Confirm specifications with your supplier.
How sensitive is this result to your assumptions?
Vary one input and inspect estimated film gsm
All other entered inputs stay fixed. Ranges are your scenarios, not statistical confidence or supplier performance predictions. This uses the same validated calculator engine.
The formula, made clear.
A square metre of film one micron thick has a volume of one cubic centimetre. This makes the numerical relationship particularly simple: thickness in microns multiplied by density in grams per cubic centimetre equals grams per square metre. The result estimates a uniform material layer. It does not automatically include printing, coatings, adhesive or other layers, all of which add mass to a finished laminate.
How to use this calculator
- 01
Select the film material or enter a custom density.
- 02
Enter nominal or measured layer thickness using the correct thickness unit.
- 03
Use the calculated GSM for preliminary weight and yield calculations, or replace it with measured GSM when known.
A calculation you can check
The example estimates the basis weight of a single material layer from its gauge and editable density.
- Film thickness
- 12 µm
- Material density
- 1.39 g/cm³
12 × 1.39 = 16.68 g/m²Check the displayed formula and units against your quotation. Use measured GSM, net weight and actual layout dimensions where available. Default densities are planning assumptions, not certified material properties. Calculated cost does not certify strength, compatibility or safe loading.
Method, units and material assumptions ↗