Trying to figure out glass thickness for small DIY Shelf Tank

[GrumpyAlison]

TLDR:
Would .125/3mm glass work for a rimless tank that's maybe 30x7x7 with 0-2 braces on the top?
eta: what length would be safe for 3/32 glass, if any (That's what's readily available in local hardware stores)

-----Backstory----
I want to make some small shelf tanks (not into paying 100 for a pre-made one) I cant decide if I should break down old tanks (10g and 20L for the thicker glass) or buy new glass. I prefer to buy new glass (I'm lazy and busy ) and I'm having trouble determining a safe thickness.

Alternately, I'm a bit confused as to what safety factor is and how one would calculate it - I couldn't find much online that made sense to me. I saw a lot of stuff about different values, but never anything that clearly explained what it meant or how to figure out what to enter into the tank.

Thanks!

 

[shwareefer]

I had a great calculator bookmarked but it uses flash so no longer works. It does tell me for almost guaranteed safety use 3.8 as a safety factor. So if you use that value in this calculator your planned tank is no problem:

Aquarium Glass Thickness Calculator

Given below is the online aquarium glass thickness calculator which helps you to calculate a volume of an aquarium, glass area, glass thickness, weight of glass and weight of water in a glass based on the length, width, height, and safety factor.

www.easycalculation.com

 

[GrumpyAlison]

I had a great calculator bookmarked but it uses flash so no longer works. It does tell me for almost guaranteed safety use 3.8 as a safety factor. So if you use that value in this calculator your planned tank is no problem:

Aquarium Glass Thickness Calculator

Given below is the online aquarium glass thickness calculator which helps you to calculate a volume of an aquarium, glass area, glass thickness, weight of glass and weight of water in a glass based on the length, width, height, and safety factor.

www.easycalculation.com

I saw that calculator (the one with flash) and was like 'ahh dang. flash' I also saw the other one but I just wasn't sure how to interpret or enter safety factor, so thanks for the help!!
I might just pick up a sheet of glass rather than spending hours breaking down old tanks.

One other question about safety factor: Is it measured from the top of the tank or the top of the water line? Like if I made an 8" tall tank and only filled it 7", should I enter 7 or 8 for height? Or am I way overthinking this XD

 

[shwareefer]

I saw that calculator (the one with flash) and was like 'ahh dang. flash' I also saw the other one but I just wasn't sure how to interpret or enter safety factor, so thanks for the help!!
I might just pick up a sheet of glass rather than spending hours breaking down old tanks.

One other question about safety factor: Is it measured from the top of the tank or the top of the water line? Like if I made an 8" tall tank and only filled it 7", should I enter 7 or 8 for height? Or am I way overthinking this XD

Overthinking but actual water height would be the deciding factor IMO, so 7" in that case.