Free · Other calculators

Aquarium Interior Shape Volumes

Calculate interior geometric volumes for seven tank shapes.

Formula & worked example
Private in your browser
No signup

Go to tool

Calculator inputs

Loading calculator…

How to use this calculator

Enter the known values in the units shown. Results update as you type.
Where results are editable, change one to solve backwards. Lock a value to hold it fixed.
Use the worked example to check the method. Reset restores the starting fields.

Private by default

Inputs and results stay in this browser tab. Bookify does not upload or store the values you enter.

Formula and method

The worked inputs demonstrate the selected model; change a known value or leave an editable unknown empty for a supported inverse.

V=base area×height; curved fronts add circular-segment area

Worked example

Enter these known values and leave the other values blank.

Select tank shape: Rectangular prism
Length: 100 cm
Width: 50 cm
Height: 40 cm

Volume: 200 L

Assumptions and limitations

Dimensions are interior full-fill dimensions. Waterline, substrate, décor and wall thickness reduce usable water volume.
Bowfront models use a minor circular segment with positive sagitta and compatible width/chord geometry.

Common questions

What does this model assume?

Dimensions are interior full-fill dimensions. Waterline, substrate, décor and wall thickness reduce usable water volume. Bowfront models use a minor circular segment with positive sagitta and compatible width/chord geometry.

How do units and inverse calculations work?

Choose compatible units for each quantity. The model converts quantities internally; supported editable fields can be solved from sufficient independent known values. Display rounding does not change the underlying value.

References

The bowfront rear-width inverse subtracts the positive sagitta from full depth; the captured plus sign chooses an incompatible rear width. Explicit model domains enforce physical bounds and strict whole-count membership where required. Explanatory image content is replaced by original dimension descriptions without changing its visibility. The corner bowfront branch uses width no greater than length to select the minor circular segment. Bookify replaces the captured rounded US gallon with the exact 3.785411784-liter definition.

Explore other calculators or browse all everyday life calculators.