To calculate the volume of a fish tank in gallons based on its dimensions, follow these steps:

1. Multiply the tank's length, width (or depth), and height.
2. Divide the result by 231 (cubic inches per gallon) to get the volume in gallons.
3. For example, an 8x8x8 tank can hold approximately 2.62 gallons ¹.
4. Standard aquarium tank sizes range from small (2-½ gallons) to large (up to 225 gallons) ².