Free aquarium weight calculator. Calculate the total weight of your filled tank (water + glass + rock + sand) and verify your floor can support it. Critical for tanks 75 gallons and up.
Most aquarium losses to a flooded floor come from underestimating total weight. A 75-gallon tank ends up around 700-900 lbs filled - well above what a poorly-positioned floor can handle long-term.
Floor load: standard residential floors support 40 lb/sq ft live load. A 75-gallon (4 ft × 1.5 ft = 6 sq ft footprint) at 800 lbs = 133 lb/sq ft, which exceeds the live load. Position over a load-bearing wall or perpendicular to floor joists. Tanks above 125 gallons typically need joist evaluation by a contractor.
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