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Aquarium lab

Aquarium water-volume calculator

Work out internal gross volume and a practical estimate of actual water.

  • Result updates as you edit
  • Units and limits shown

Starting scenario

  • Internal length80cm
  • Internal width35cm
  • Water height40cm
Result112litres

Aquarium inputs

Calculation workbench

Adjust the inputs. The result updates immediately, with the calculation method explained below.

Aquarium inputs

Calculated result

Estimated volumelitres

Result updates as you edit

Visual reference

What the measurements represent

The drawing separates internal dimensions from the space actually occupied by water.

Volume and circulation

Aquarium technical cutaway

Gross volume112L

Aquarium technical cutaway Diagram of internal volume, water level, substrate and the route water takes through the filter. Internal length: 80 cm. Internal depth: 35 cm. Water height: 40 cm. Gross volume: 112 L. Substrate Water circuit Filter Intake Return Internal length · 80 cm Water height · 40 cm Internal depth 35 cm
Gross volume
112 L
length × depth × height ÷ 1,000
80 × 35 × 40
Water circuit
Intake → Filter → Return
Initial example using the default 80 × 35 × 40 cm values. This is a fixed reference: it does not change when you edit the form; your updated result appears above.

Calculation logic

What it calculates

Formula

Internal length × internal width × water height ÷ 1,000.

Limits

This is internal gross volume; substrate, hardscape, equipment and the unfilled rim still displace water.

Next step

Measure inside the glass, then use a net-volume estimate for flow, heating and maintenance.

Aquarium lab

Tank turnover calculator

Compare measured filter output with the aquarium’s net water volume.

Open calculator

Real filter-flow estimator

Allow for common losses between a headline pump rating and installed output.

Open calculator

Aquarium heater estimator

Estimate heating power from water volume and the coldest room temperature.

Open calculator