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Aquarium Water Volume from Dimensions Calculator

Gallons = L × W × H × 0.004329 (inches) or /3785 (cm).

Compute the water volume of a rectangular aquarium from its inner dimensions, then convert to litres and US gallons. Volume = L × W × H (inches³) × 0.004329 gal/in³. Helps with proper stocking levels (1 inch of fish per gallon), filtration sizing, and chemical dosing.

Nadia Almasri By Nadia Almasri
Published Last reviewed 1 min read

Inputs

in
in
in

Results

Enter values and click Calculate to see results.
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How to use this calculator

  1. Fill in the inputs above using the units you already have.
  2. Values update automatically as you type — no submit button needed.
  3. Hover any result row for the underlying formula and intermediate values.

Formula

Gal = L·W·H·0.004329 (inches).

In depth

Compute the water volume of a rectangular aquarium from its inner dimensions, then convert to litres and US gallons. Volume = L × W × H (inches³) × 0.004329 gal/in³. Helps with proper stocking levels (1 inch of fish per gallon), filtration sizing, and chemical dosing.