π Fish Tank & Aquascaping Engineering
Aquarium Volume & Water Weight Calculator
Compute total water capacity in US Gallons and Liters, calculate substrate sand displacement, and verify structural floor loading weight requirements.
π 10 Gallon (20Γ10Γ12 in)
πΏ 20 Gallon High (24Γ12Γ16 in)
π± 20 Gallon Long (30Γ12Γ12 in)
π 30 Gallon (36Γ12Γ16 in)
π‘ 55 Gallon (48Γ13Γ20 in)
π¦ 75 Gallon (48Γ18Γ21 in)
Tank Dimensions (Inches)
Actual Net Water Volume
48.6 US Gallons
Total Water Weight
405.3 lbs
183.8 kg
Filled Tank Total
~525 lbs
Water + Glass + Sand
Substrate Weight
~65 lbs
Gravel / Sand
π‘ Structural Floor Support Warning:
Filled aquariums weigh roughly 10 to 12 lbs per gallon when factoring in glass weight, canopy, and gravel. Ensure floor joists run perpendicular under tanks ≥ 55 gallons.
Aquarium Mathematics & Displacements
Calculate tank volume in cubic inches ($V = L \times W \times H$) and divide by 231 (1 US liquid gallon = $231\text{ cubic inches}$):
- Gross Gallons: $$\text{Gallons} = \frac{\text{Length (in)} \times \text{Width (in)} \times \text{Height (in)}}{231}$$
- Liters: $$\text{Liters} = \text{Gallons} \times 3.78541$$
- Substrate Displacement: Every inch of gravel or aquasoil substrate displaces $\sim 5-8\%$ of water capacity while adding significant deadweight to the stand.