How To Compare Liner Units - MIL vs Gauge

WRITTEN BY:  Inyo Pools

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Manufacturers commonly describe the thickness of their liners in MILs or Gauges. Some use the terms interchangeably like they are the same. They aren't. MIL designated liners are 6-12% thicker than a Gauge designated liner for the same number. For example, a 25 MIL liner is about 12% thicker than a 25 Gauge liner. This guide shows the differencs to give you a better understanding of what thickness liner you are buying.

Step by Step


Step 1

20 units - A 20 Gauge liner is 0.0185 inches thick. A 20 MIL liner is 0.0205 inches thick or approximately 11% thicker than a 20 Gauge liner.

Step 2

25 units - A 25 Gauge liner is 0.0223 inches thick. A 25 MIL liner is 0.0250 inches thick or approximately 12% thicker than a 20 Gauge liner. By comparison a dime is 0.0490 inches thick or just under twice the thickness of a 25 MIL liner.

Step 3

30 units - A 30 Gauge liner is 0.0260 inches thick. A 30 MIL liner is 0.0275 inches thick or approximately 6% thicker than a 30 Gauge liner.


(1 to 11 of 11)

Inyopools  Posted: 11/04/2016 12:07 PM  Inyo Product Specialist

DT - Pool liners aren't sold in that thin a gauge or mil. However, going by the very rough gauge to mil comparison (e.g.- a mil is about 10% thicker than a gauge), a 12 gauge would be thicker than a 9 mil.

DT  Posted: 11/02/2016 20:07 PM 

who wins? the guy with the 12 gage or the guy with the 9 mil

Inyopools  Posted: 09/13/2016 22:25 PM  Inyo Product Specialist

duh people - In pools vinyl liners, gauge sizes are reversed from sheet metal gauge sizes. For vinyl liners, 25 gauge is heaver than 20 gauge.

duh people  Posted: 09/11/2016 18:15 PM 

Lynch -

25a. thicker than 20 ga. ??

Think again.

You can dent 25 ga. sheet metal with your hand

you would need a hammer to dent 20ga. sheet metal

Gauges get thicker as they go down

Inyopools  Posted: 12/05/2014 9:07 AM  Inyo Product Specialist

mcphunter - 25ga is thicker than 20ga.

mcphunter  Posted: 12/04/2014 8:35 AM 

which is thicker 20ga or 25ga???

Inyopools  Posted: 04/30/2014 9:18 AM  Inyo Product Specialist

debs - The thickest, beaded, pool liner that you sell is 27 MILs.

debs  Posted: 04/29/2014 11:21 AM 

So what exactly is the thickest, beaded, pool liner that you sell?

Inyopools  Posted: 12/12/2013 11:19 AM  Inyo Product Specialist

suezew - I have only seen this comparison for the common liner thicknesses. You could estimate that any MIL liner thickness is approximately 10% thicker than a comparable gauge thickness. Be aware that this comparison is for liners only. It will be different for other materials like steel.

suezew  Posted: 12/11/2013 13:44 PM 

Is there a chart listing this information starting with 1 guage/mill?

Anonymous  Posted: 01/08/2013 12:43 PM 

so what is 12 gauge v.s. 8 mil?