How to Calculate Aquarium Calculator
What is Aquarium Calculator?
An aquarium volume calculator determines the water capacity of a fish tank from its dimensions, helping fishkeepers choose correct equipment, stocking levels, and water treatment doses.
Formula
Volume = Length × Width × Height (cm³); Litres = cm³ / 1,000; US gallons = litres / 3.785
- L
- Length (cm)
- W
- Width (cm)
- H
- Height (cm)
- V
- Volume (litres)
Step-by-Step Guide
- 1Volume = Length × Width × Height
- 2Subtract ~10% for substrate, decorations, and air space
- 3Litres = cm³ / 1,000; US gallons = litres / 3.785
- 4Stocking: 1 cm of fish per 1–2 litres is a rough guideline
Worked Examples
Input
Tank 60cm × 30cm × 36cm
Result
60×30×36 = 64,800 cm³ = 64.8L = 17.1 US gallons
Frequently Asked Questions
Why subtract 10% from tank volume?
Substrate, decorations, and air space occupy roughly 10% of the total volume, reducing usable water.
What is the 1cm fish per 1-2L rule?
This guideline suggests stocking density: 1 cm of fish length needs 1-2 litres of water for health and waste management.
How do I convert between gallons and litres?
1 US gallon = 3.785 litres; 1 imperial gallon = 4.546 litres.