Calculator
How many gallons is my tank?
Free aquarium volume calculator. Enter tank dimensions in inches or centimeters and get gallons + liters. Works for rectangular, bowfront, cube, and cylinder tanks.
Inputs
Enter values + click Calculate.
How it works
Step 1Rectangular: L x W x H / 231 = US gallons
Step 2Cylinder: pi x r² x H / 231 = US gallons
Step 3Subtract 5-10% for substrate, rock, and rim glass to get TRUE water volume