How it works
US gallons = length × width × height ÷ 231litres = cubic inches × 0.01639
- length
- tank length in inches
- width
- front-to-back depth in inches
- height
- tank height in inches
This is the tank's full capacity. Actual water volume is a bit less once you account for substrate, decorations and filling below the rim.
Frequently asked questions
How many gallons is a 24x12x16 tank?
About 20 US gallons.
How many cubic inches in a gallon?
231 for a US gallon.
How do I convert to litres?
Multiply cubic inches by 0.01639, or US gallons by 3.785.
Is the real water volume less?
Yes, gravel, rocks and the gap below the rim reduce it slightly.