Aquarium Volume Calculator (Feet to Liters)
Convert your aquarium dimensions from feet to liters easily. Enter the length, width, and height in feet, and we'll calculate your tank’s volume in liters.
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How to Convert Aquarium Dimensions to Liters
Aquarium size is typically described in terms of its volume, which can be measured in gallons or liters. While gallons are more common in the U.S., many hobbyists around the world, especially in Europe and Asia, prefer to use liters. Our calculator helps convert aquarium dimensions entered in **feet** into **liters** instantly and accurately.
Basic Conversion Formula
The volume of a rectangular aquarium is calculated with the formula:
Volume (cubic feet) = Length × Width × Height
Then, convert to liters:
1 cubic foot = 28.3168 liters
So:
Volume (liters) = Length × Width × Height × 28.3168
Examples
- 1 ft × 1 ft × 1 ft = 28.3 liters
- 2.5 ft × 1.5 ft × 1.5 ft = approx. 159.8 liters
Why Use Liters?
- Most water conditioners and medications are dosed in ml/liters
- Metric measurements are easier for precision dosing
- Standard across Europe, Asia, and scientific documentation
Common Aquarium Sizes in Feet and Liters
| Dimensions (L×W×H ft) | Volume (Liters) | Common Name |
|---|---|---|
| 1 × 1 × 1 | 28.3 | Cube Nano |
| 2 × 1 × 1.5 | 84.9 | Standard 20-30 gal equivalent |
| 2.5 × 1.5 × 1.5 | 159.8 | Medium planted tank |
| 4 × 1.5 × 2 | 339.8 | Large show tank |
| 6 × 2 × 2 | 678.6 | Monster tank / Predator setup |
Consider Water Displacement
The calculated volume assumes the tank is completely full. In reality, you may have:
- Decorations and rocks
- Gravel or sand substrate
- Plants, wood, and filters
This can reduce actual water volume by 10–15%. For dosing medications or conditioners, always measure actual water volume if possible.
Quick Tips
- Always measure interior tank dimensions for highest accuracy
- Subtract 1–2 inches (or cm) for water line clearance
- Round to the nearest 5 liters for practical use
Frequently Asked Questions
How accurate is this volume calculator?
It's highly accurate for standard rectangular tanks. For bowfront, hex, or custom shapes, adjust manually by using geometric volume formulas.
Can I convert liters to gallons?
Yes. 1 U.S. gallon = 3.78541 liters. Divide total liters by 3.78541 to get gallons.
Why use feet instead of inches?
Feet are often used for larger tanks, making input faster and easier. The calculator also handles decimal feet (e.g., 2.5 feet).
What if I have a rimless tank?
Rimless tanks are often filled closer to the top. You may use the full height in the calculation but subtract 5–10 liters if unsure.
Conclusion
Whether you're planning a new tank, upgrading, or calculating water treatments, knowing your aquarium volume in liters is essential. With this calculator, you can easily convert dimensions in feet into liters with precision and confidence. Ideal for hobbyists using metric systems or dosing products by the liter, this tool is your go-to resource for accurate tank volume estimations.