What is the measure of a 20 gallon fish tank?

The dimensions of a 20 gallon fish tank can vary depending on the shape of the tank. However, a common measurement for a 20 gallon tank is 24 inches long by 12 inches wide by 16 inches high. This gives the tank a total volume of approximately 20 gallons. Other common dimensions for a 20 gallon tank include 30 inches long by 10 inches wide by 12 inches high and 24 inches long by 16 inches wide by 8 inches high.