Film Thickness Converter
Move instantly between micron (µm), mil, gauge, 丝 and millimetres. Enter any value to see every other unit at once, handy when a spec sheet lists gauge but your supplier quotes in micron.
Convert a thickness
Type a value and pick its unit. The rest update live.
Quick presets (micron)
Results in every unit
Laminate total thickness
Add up the layers of a laminated structure, such as PET / foil / PE. Values in micron.
Adhesive or coating layers add a few micron. Include them as a layer if known.
Tolerance range
See the allowed thickness window for the value entered on the left.
Typical film tolerance is about ±10%. Confirm the exact figure with your supplier.
How the units relate
- 1 mil = 25.4 µm (one thousandth of an inch).
- 100 gauge = 1 mil = 25.4 µm, so 1 gauge = 0.254 µm.
- 1 丝 (si) = 10 µm = 0.01 mm.
- 1 mm = 1000 µm.
- 1 inch = 25.4 mm = 1000 mil.
Gauge is common on US film spec sheets, micron and 丝 dominate in Asian production, and mil appears in North American liner and bag specs. Mixing them is the number one cause of ordering the wrong film.
Film thickness conversion table
Common flexible-packaging film thicknesses across every unit. Tap a row to load it into the converter. Values are rounded for reference.
| Micron (µm) | Mil | Gauge | mm | 丝 |
|---|
Ready to order? Get these bag types made
Turn the numbers above into a finished spec sheet. Send us your dimensions, material and quantity and our engineers reply with a firm quote and free samples within one business day, produced in-house at our own cleanroom facility.
Mylar Bags
High-barrier mylar for long shelf life and light protection.
Aluminum Foil Bags
Foil laminates for maximum oxygen and moisture barrier.
Stand-Up Pouches
Resealable, shelf-ready pouches for food, coffee and supplements.
Ziplock Bags
Reclosable zipper bags in barrier or clear film.
Need this spec produced, not just calculated?
We are a direct manufacturer of custom flexible packaging, producing in-house since 2005 in a cleanroom facility. Send us your target numbers and our team will confirm feasibility and quote, with free design support included.
Frequently asked questions
What is the difference between micron and mil?
Both measure thickness. A micron is one thousandth of a millimetre, while a mil is one thousandth of an inch. 1 mil equals 25.4 micron.
How do I convert gauge to micron?
In flexible packaging, 100 gauge equals 1 mil, which is 25.4 micron. Multiply the gauge value by 0.254 to get micron. For example, 400 gauge is about 101.6 µm.
What film thickness do I need for my pouch?
It depends on the product weight, barrier needs and pouch style. Many stand-up pouches use a laminate of roughly 100 to 150 µm in total. Send us your product details and we will recommend a structure.
Can we match a specific film thickness and structure?
Yes. Share your target thickness, layers and quantity and our team will confirm feasibility and quote.
Results are engineering estimates for planning and quoting. Real-world values vary with material lot, structure, tolerance and process. For production-grade figures, confirm with our team.