GSM to Micron Converter
Convert material weight (GSM) into theoretical thickness in microns, millimetres, mils and inches using density. Works for paper, board, film, nonwoven and foil.
Input
Formula: thickness (μm) = GSM ÷ density (g/cm³). GSM = thickness (μm) × density.
Result
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Thickness of the same GSM in different materials
Typical density reference
| Material | Density (g/cm³) | Thickness at current GSM (μm) |
|---|
Densities are typical values. Actual products vary with grade, filler and porosity.
How to use
- Choose a direction: GSM to thickness or thickness to GSM.
- Pick a material preset or type your own density in g/cm³.
- Enter the value and the number of layers if the product is laminated.
- Read the result in several units and compare materials in the chart and table.
Formula and assumptions
- 1 GSM equals 1 g/m². With density in g/cm³, 1 g/m² of 1 g/cm³ material is 1 μm thick.
- Results are theoretical and assume a solid, uniform, void-free material.
- Paper, board and nonwoven are porous, so measured caliper is usually higher than the theoretical value.
Frequently asked questions
How do I convert GSM to microns?
Divide the GSM by the material density in g/cm³. For example, 92 GSM PE film with density 0.92 g/cm³ is 100 μm thick.
Why is paper thickness different from the calculated value?
Paper has air between fibres, so its apparent density is lower than fibre density, often 0.7 to 0.9 g/cm³. Use the bulk density from your supplier for a closer estimate.
What density should I use for plastic films?
Typical values are LDPE 0.92, HDPE 0.95, PP 0.91, PET 1.38, PVC 1.38 and nylon 1.14 g/cm³. Check your datasheet for exact figures.
What is a mil, and how does it relate to microns?
One mil is one thousandth of an inch, which equals 25.4 μm. Many North American film specifications use mils.
Can I convert thickness back to GSM?
Yes. Switch to the thickness to GSM mode and enter microns. GSM equals thickness in μm multiplied by density in g/cm³.
Need help choosing the right material?
Send us your target thickness, weight and application. Our team will recommend suitable options and quote quickly.