Tank Volume Calculator
Calculate volume, surface area, and water weight across common aquarium shapes.
Volume (Liters)
64.8
Volume (Gallons)
17.12
Surface Area (cm2)
1800
Water Weight (kg)
64.8
Approx. 17.12 gallons of water
Related Guide
Measure inside dimensions when possible, not outer glass dimensions. Inside dimensions give a closer estimate of real water capacity.
For irregular tanks, treat the tank as simple shapes and sum their volumes. This is exactly how the L-shape calculation works in this tool.
For stocking and equipment planning, use the estimated usable volume, which is typically 80-90% of theoretical volume.
FAQ
Should I calculate with full tank height?
For practical use, subtract a few centimeters for the waterline and equipment displacement.
Why does real water volume differ from label volume?
Glass thickness, substrate, hardscape, and equipment reduce usable water volume.
Is bow-front calculation exact?
When bow depth is 0, a legacy ~10% bump is applied (typical retail approximation). When you enter bow depth, volume scales with depth relative to tank width — still planning-grade, not engineering precision.
How is water weight estimated?
Freshwater is approximated at 1 kilogram per liter.
Can I use imperial inputs only?
Yes. Switch to imperial mode and enter inches. Results still show both liters and gallons.
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Results are estimates based on general guidelines. Individual species may have specific requirements.