Aquarium Volume Calculator
Setting up a new fish tank? Calculate the exact water volume in gallons and liters, and estimate the total weight.
🐠Aquarium Volume
Formula:
Volume = L × W × H
231 Cubic Inches = 1 US Gallon
Inches
Inches
Inches
Estimated Volume
US Gallons
—
Liters
—
Mathematical Principles
Aquarium volume is calculated by finding the cubic volume of the tank shape and then converting it to liquid gallons.
1. Volume Formulas (Cubic Inches)
- Rectangle: Volume = Length × Width × Height
- Cylinder: Volume = π × (Diameter / 2)² × Height
- Hexagon: Volume = (3√3 / 2) × Side² × Height
2. Gallon Conversion
There are exactly 231 cubic inches in 1 US Gallon.Volume (gal) = Volume (in³) / 231
3. Weight Estimation
Water is heavy! 1 US Gallon of freshwater weighs about 8.34 lbs (3.78 kg).Weight (lbs) = Gallons × 8.34
Related Liquid Calculators
Find the right tool for your next calculation
Frequently Asked Questions
Measure the length, width, and height in inches. Multiply them to get cubic inches, then divide by 231 to get US gallons.
Need Help?
Check out our detailed guide to understand how to use this calculator and the concepts behind it.
Aquarium calculation guide