Aquarium Volume Calculator
Calculate aquarium volume for rectangular, cylindrical, and bow-front tank shapes.
Aquarium Volume Calculator
Calculate your aquarium volume in liters and gallons
Formula
Volume varies by shape: L×W×H, πr²h, or rectangular + bow sectionHow to Use
- 1Select tank shape — Choose rectangular, cylindrical, or bow-front from the shape selector.
- 2Enter dimensions — Measure and enter the length, width, and height of your tank in inches or centimeters.
- 3Review the results — Instantly see the volume in gallons, liters, and cubic inches.
- 4Plan your stocking — Use the volume to determine appropriate fish stocking levels and equipment sizing.
Frequently Asked Questions
How do I calculate the volume of my aquarium?
For rectangular tanks, multiply length × width × height and divide by 231 to get US gallons. Our calculator handles this and other shapes automatically.
What is a bow-front aquarium?
A bow-front aquarium has a curved front glass panel that adds extra volume compared to a standard rectangular tank of the same footprint.
How many gallons is a 20×10×12 tank?
A rectangular tank measuring 20×10×12 inches holds approximately 10.4 US gallons (39.3 liters) of water.
Should I account for substrate and decorations?
Yes, subtract about 10% from the calculated volume if you have a thick substrate layer and large decorations.