Fish Tank Volume
Compute the water volume of a rectangular aquarium in liters and gallons.
About Fish Tank Volume
A cubic centimeter holds one milliliter, so the three dimensions divide by 1000 to give liters, then convert to gallons. Volume drives heater wattage, filter size, dosing and stocking, so measuring the tank correctly prevents equipment mistakes.
Formula
Fish Tank Volume
Volume = length x width x height (cm) / 1000 for liters
- substrate
- Gravel bed ~3 cm raised floor reducing real water volume
Worked example
With the default values below, Fish Tank Volume returns Volume of 72.0. Change any input above and every figure here is recalculated in your browser.
Inputs used
- Lengthminimum 1 cm
- 60 cm
- Widthminimum 1 cm
- 30 cm
- Heightminimum 1 cm
- 40 cm
Results
- Volume
- 72.0 L
- Volume
- 19.0 gal
- Water After Substrate
- 66.6 L
Step by step
- 1Values used
- 2Fish Tank Volume
- 3Volume= 72.0 L
- 4Volume= 19.0 gal
- 5Water After Substrate= 66.6 L
Assumptions and limits
- The result is derived only from the 3 inputs listed above. Anything not among them is not part of the calculation.
- In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
- Figures are rounded for display to 1 decimal place, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.
How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.
Frequently Asked Questions
How is Fish Tank Volume calculated?
Volume = length x width x height (cm) / 1000 for liters A cubic centimeter holds one milliliter, so the three dimensions divide by 1000 to give liters, then convert to gallons.
Why does Fish Tank Volume matter?
Volume drives heater wattage, filter size, dosing and stocking, so measuring the tank correctly prevents equipment mistakes.
What values do I need to enter?
This calculator takes 3 inputs: Length, Width, Height. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.