Calculate regular hexagon fish tank volume from one side panel and height.
Open live calculator →A hexagon tank with 30 cm sides filled to 45 cm holds about 105.2 litres.
Assumes a regular hexagon with six equal sides, measured internally.
A regular hexagonal aquarium's footprint is six equal panels. Enter the internal width of a single panel and the water height for the tank's capacity in three unit systems.
The live tool updates immediately and shows the result in the units commonly used by aquarium keepers around the world.
Measure one flat panel, not the distance across the tank.
The formula assumes all six sides are equal.
Tall hexagons need careful, modest stocking.
For a regular hexagon, the base area is (3√3 ÷ 2) × side², which is about 2.598 × side². Multiply that area by water height for volume. The calculator does this from your side length and height.
Measure one flat panel's internal width—corner to corner along a single pane. Do not use the distance across the whole tank; that is a different dimension and inflates the result.
They look striking but are usually tall with a small footprint, which limits swimming length and surface area for gas exchange. Choose tall-tolerant, slow species and stock modestly.