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Aquarium Volume Calculator

Calculate rectangular aquarium capacity in liters and US gallons from internal dimensions and actual water depth.

Aquarium Volume Calculator

FREE ONLINE TOOL
Assumptions and limits

Rectangular tanks only. Use internal measurements; glass thickness reduces capacity. Displacement is your estimate. This does not size filtration or determine stocking, water chemistry or medication doses.

Formula

Liters = L(cm) × W(cm) × water depth(cm) / 1000; usable liters = liters × (1 − displacement / 100); US gal = liters / 3.785411784.

Example

60 × 30 × 35 cm of water gives 63 L; allowing 10% displacement gives 56.7 L.

STEP BY STEP

How to use aquarium volume calculator

  1. Calculate and read the result in the displayed units.
  2. Review the formula, example and limits.

IN PRACTICE

Example

60 × 30 × 35 cm of water gives 63 L; allowing 10% displacement gives 56.7 L.

GOOD TO KNOW

How should I interpret this result?

Rectangular tanks only. Use internal measurements; glass thickness reduces capacity. Displacement is your estimate. This does not size filtration or determine stocking, water chemistry or medication doses.

Practical guides

How to Calculate Aquarium Volume in Liters and US Gallons →

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