calcs.homes
calcs.homes
Enter your tank's inside dimensions to get its water volume and the weight of the tank once it's filled — handy for checking whether a stand or floor can support it.
Estimate only — measure inside the glass, and add the empty tank's weight for total load.
We multiply inside length × width × height (in inches) and divide by 231 — the number of cubic inches in a US gallon — to get gallons; the metric version divides length × width × height in centimeters by 1,000 to get liters directly. Water weight comes from multiplying gallons by 8.34 lb, or liters by 1 kg, since fresh water weighs almost exactly that per unit at room temperature.
Using water height rather than tank height matters, since most tanks aren't filled to the rim and printed gallon ratings are often rounded to a nearby round number. The weight figure matters for more than curiosity, too — a 55-gallon tank holds over 450 lb of water alone, and once you add the glass, substrate, and rock on top of that, the total load needs a stand and floor genuinely rated to carry it.
Measure the inside length, width, and water height in inches, multiply them together, and divide by 231. This calculator does that for you — just enter your measurements.
Add the water weight shown here to the empty tank, gravel, and decor weight, then check that figure against your stand's rating and, for larger tanks, your floor's load capacity.