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Originally Posted by endparenthesis
So to do that, one would just subtract double that thickness from the width, from the length, and once from the height, correct?
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Yup, it's that simple, provided of course you were you were taking external dimensions of the tank, and glass thickness, as input. Another way around it is to just do a straight calculation and state clearly for people to input the interior dimensions of the tank. But that's less desirable, as that number is not as easy to come by.
Problem is, most tank volume calculators out there do one of two things - either do a straight calculation of volume based on dimensions provided (which will give most people an incorrect answer because most people will provide the exterior dimensions of their tank), or they get fancy and assume people will be providing exterior dimensions, and then make an assumption about the glass thickness. Both imperfect calculations.
So I'm just asking either:
1) Tell people to provide interior dimensions and do a straight volume calc.
- or much better -
2) Tell them to provide exterior dimensions AND glass thickness, so they and provide the most convenient form of measurement (exteriors) you can do an accurate calculation.
Now with all that said, many people will not know the thickness of their glass. So if they don't know, you can just ask if it is glass or Plexiglas, and if it has a rim or not, and you could make some pretty good assumptions about that thickness.
If you need help with those assumptions, please just shoot me a pm.
Thanks.