I've been noticing weird measurements/inaccurate gallonage lately. Maybe because I recently started paying attention. For example, a 125g was offered with the outside dims of 72x18x18. If you use the outside dims that's only 101g! Now if you take into account standard fill levels and glass thickness the new measurements are 71.25x17.25x16.375. Use those to find the new gallonage....87.13g. Wow! That's more than a 30g difference from the manufacturers quoted gallonage.
I used a .375" (3/8) side glass thickness, .625" (5/8) bottom glass thickness, I assumed the tank was filled 1" from the top.
Next lets do my tank, a typical 120g with outside dims if 48x24x24. Taking the same assumptions from above my inside measurements are, 47.25x23.25x22.375. This makes my tank a 106.41g. Is there actually 106g in my DT? No. I didn't take into account my overflows, rock, or sand.
The question is now how many gallons do you actually have?
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