Tank Count Estimator Phone Use this calculator to help estimate the number of tanks necessary to hold all your fish. Number of fish < 9" 0 fish Number of fish 9" to 11" 0 fish Number of fish 12" to 15" 0 fish Number of fish 16" to 19" 0 fish Number of fish 20" to 23" 0 fish Number of fish 24" to 27" 0 fish Number of fish 28" or Larger 0 fish Calculate for Tank Size 6' Tanks 8' Tanks Tanks Number of Tanks For All Fish: Show Calculation Data Show Calculation Data