Well, howdy there, y’all! Folks keep askin’ me, what is 20 gauge in mm? Well, hold your horses, it ain’t as simple as countin’ your chickens. First off, you gotta understand, this “gauge” thing, it’s like… well, it’s like how thick somethin’ is, but they use these fancy numbers ‘stead of just sayin’ it straight out.
Now, if you’re talkin’ about sheet metal, like for a roof or somethin’, 20 gauge is gonna be different than if you’re talkin’ about wire. See, they got different rules for different things, makes it right confusing, I tell ya. For steel, if it’s 20 gauge, it’s gonna be ’bout, oh, I don’t know, somewhere between 0.734 mm and 0.912 mm. That’s what them smart folks with their fancy tools say, anyway. I just eyeball it, myself.

But if you’re talkin’ about wire, 20 gauge wire is gonna be different. It’s gonna be around 0.8 millimeters, see? A little bit smaller. Why they gotta make it so complicated, I just don’t know. They coulda just stuck with one way of measurin’, but nooo, they had to go and make it all fancy.
And then there’s aluminum and stainless steel, and all them other fancy metals. Each one’s got its own little way of doin’ things with the gauge. It’s enough to make your head spin! So, if you got some 20-gauge aluminum, it might be a bit different than 20-gauge steel. You gotta know what you’re workin’ with, that’s for sure.
- Steel: 20 gauge is usually between 0.734 mm and 0.912 mm.
- Wire: 20 gauge is around 0.8 mm.
- Aluminum: It’s gonna be different, you gotta check a chart or somethin’.
- Other metals: Don’t even get me started! They all got their own thing goin’ on.
Now, if you’re really needin’ to know for sure, there’s these things called calculators. Yep, you just punch in the gauge and what kind of metal you got, and it spits out the answer in millimeters. Pretty fancy, huh? I reckon it’s quicker than tryin’ to figure it out with a ruler, that’s for sure. I seen my grandson use one of them fancy contraptions on his phone once.
I remember one time, my old man needed some sheet metal for the barn roof. He sent me down to the hardware store and told me to get 20-gauge. Well, I got there, and the fella behind the counter started askin’ me all sorts of questions – what kind of metal, what it was for… I just wanted the darn metal! Ended up gettin’ the wrong stuff, had to go back and swap it out. Learned my lesson that day, gotta know what you’re talkin’ about when it comes to this gauge business.
So, 20 gauge in mm? It ain’t just one answer, see? You gotta know what you’re measurin’ and what it’s made of. But if you’re talkin’ steel, like for a roof or somethin’, it’s gonna be around 0.81 mm. For wire, it’s about 0.8 mm. And for the rest, well, you might need one of them fancy calculators or a chart to figure it out. Or just ask somebody who knows, that’s what I always do.
And another thing, don’t go mixin’ up inches and millimeters. That’s a whole ‘nother kettle of fish! If you got somethin’ in inches and you wanna know how many millimeters it is, you gotta do some convertin’. It’s all numbers, numbers, numbers, makes my head hurt just thinkin’ about it.

Anyways, I hope that clears things up a bit. This 20 gauge to mm thing ain’t as straightforward as it seems, but with a little bit of know-how, you can figure it out. Just remember, different metals, different rules. And if you’re ever in doubt, ask someone who knows, or use one of them fancy calculators. Don’t go guessin’, unless you like doin’ things twice!
Converting from gauge to mm ain’t always easy, it can be tricky like tryin’ to catch a greased pig. You really do need a chart or calculator, else you will probably mess it up. Just make sure that you have the correct conversion for the material you have. That’s the most important thing in convertin’ measurements and such.
Tags: [20 gauge, mm conversion, steel thickness, wire gauge, sheet metal, aluminum gauge, stainless steel gauge, gauge to mm calculator, metal thickness, measurement conversion]