Aquarium volume calculator
A tank never holds its nominal volume. Substrate, rock and the gap below the rim can take 20% of it.
Actual water volume
235.0L
- Nominal tank volume
- 297.0
- Water in US gallons
- 62.08
- Total weight when set up
- 365.7
- Weight of the water
- 235.0
- Weight of the substrate
- 51.8
- Weight of the glass
- 58.9
- Pressure on the floor
- 6.64 kPa
Show the working
- Length = 120
- Width = 45
- Height = 55
- Gap below the rim = 4
- Substrate depth = 6
- Rock and decor volume = 8
- Glass thickness = 10
- Nominal tank volume = 120 * 45 * 55 / 1000 = 297
- water_height = max(55 - 4 - 6, 0) = 45
- Actual water volume = 120 * 45 * 45 / 1000 - 8 = 235
- substrate_liters = 120 * 45 * 6 / 1000 = 32.4
- Weight of the substrate = 32.4 * 1.6 = 51.84
- Weight of the water = 235 = 235
- Weight of the glass = (2*(120*55) + 2*(45*55) + 120*45) * 10/10 / 1000 * 2.5 = 58.875
- Total weight when set up = 235 + 51.84 + 58.875 + 8 * 2.5 = 365.715
- Water in US gallons = 235 / 3.785411784 = 62.0804
- Pressure on the floor = 120 * 45 > 0 ? 365.715 * 9.80665 / (120 * 45 / 10000) / 1000 : 0 = 6.641 55
Values are shown to six significant figures here; the arithmetic itself runs on exact fractions and is only rounded where a number is printed.
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The formula
- water volume = footprint x water depth - displacement of rock and decor
A 300-litre tank weighs around 400 kg set up. Check what the floor and the stand can take before filling it.
Dose by actual water volume, not by the number on the box. Overdosing medication is a common way to lose a tank.