How To Compare Liner Units - MIL vs Gauge


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Manufacturers commonly describe the thickness of their liners in MILs or Gauges. Some use the terms interchangeably as 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 differences to give you a better understanding of what thickness liner you are buying.

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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.

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(1 to 15 of 15)

 Posted: 4/20/2019 

what Gauge is a 12 mil above ground pool liner?

InyoPools Product Specialist  Posted: 4/24/2019 

Hello Edward - Liners are typically sold as either 20 gauge or 25 gauge. A 12 mil liner is on the thinner side, so that was probably sold as a 20 gauge liner. 

 Posted: 8/16/2018 

Hello Tina - A liner listed at 25 gauge would be similar to one listed at 20 mil.

 Posted: 6/26/2018 

Would a 25 gauge be comparable to a 20 mil liner???

InyoPools Product Specialist  Posted: 11/4/2016 

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.

 Posted: 11/2/2016 

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

InyoPools Product Specialist  Posted: 9/13/2016 

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.

 Posted: 9/11/2016 

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 Product Specialist  Posted: 12/5/2014 

mcphunter - 25ga is thicker than 20ga.

 Posted: 12/4/2014 

which is thicker 20ga or 25ga???

InyoPools Product Specialist  Posted: 4/30/2014 

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

 Posted: 4/29/2014 

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

InyoPools Product Specialist  Posted: 12/12/2013 

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.

 Posted: 12/11/2013 

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

Anonymous  Posted: 1/8/2013 

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